SVIBOR - Papers - project code: 4-01-039

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Published papers on project 4-01-039


Quoted papers: 0
Other papers: 20
Total: 20


  1. Type of paper: Paper in journal

    Title: Heterotic effects of somatic embryogenesis and callogenesis in some hybrids of maize (Zea mays L.) in vitro

    Authors:
    Pavlina-Šutina, Renata (74221)
    Journal: Acta Horticulturae
    Number: 289
    Year: 1991
    Pages: from 255 to 256
    Language: engleski

  2. Type of paper: Paper in journal

    Title: Control of maize stalk rot through breeding

    Authors:
    Palaveršić, Branko (73714)
    Brekalo, Josip (125712)
    Buhiniček, Ivica (195150)
    Rojc, Marijan (76091)
    Journal: Agronomski glasnik
    ISSN: 0002-1954
    Volume: 54
    Year: 1992
    Pages: from 401 to 418
    Number of references: 40
    Language: hrvatski
    Summary: Results of a study of methods of artificial stalk infection with two pathogens are given and different ways of evaluating stalk rot as a criterion in breeding maize for resistance to stalk rot. No correlative association was found between the degree of inbreds' resistance to artificial infection with Fusarium graminearum and natural stalk rot (r=0.01-0.02). However, high and significant correlation coefficients between the two rating methods of stalk anthracnose were found, i.e. between the number of internodes infected and the number over 75 % iof internodes infected (r=0.86** and 0.88**). Considerably lower correlation coefficients (r=0.20 and r=0.34) were found between line resistance to artificial infection with Fusarium graminearum and the number of internodes infected with Colletotrichum graminicola. Evaluation of stalk anthracnose on the basis of outer stalk discoloration did not correlate with the two former rating methods, but it mostly agreed with natural Fusarium stalk rot (r=0.60** and r= 0.64**). On the basis of those two criteria, the highest resistance to stalk rot was exhibited by inbreds: Bc70153, Bc 70152, Bc 70151, Bc 16881, Bc 15210, Bc 20416, Bc 31002, and Bc 19402, whereas the most susceptible inbreds were Bc 701-6, Bc 747-8, Bc 405-5, and Bc 406-88.

  3. Type of paper: Paper in journal

    Title: Selection of the maize hybrid combination BcEH 5982 by testing for yield and stalk strength

    Authors:
    Kozić, Zdravko (95860)
    Palaveršić, Branko (73714)
    Stastny, Karlo (73683)
    Buhiniček, Ivica (195150)
    Journal: Poljoprivredne aktualnosti
    ISSN: 0350-6622
    Volume: 29
    Year: 1993
    Pages: from 357 to 363
    Number of references: 7
    Language: hrvatski
    Summary: Based on the trials with maize testcrosses conducted at three locations (Rugvica, Pitomača, Kutjevo) and the trials with two plant densities (57,142 and 89,286 plants/ha) in Rugvica, the most valuable from the agronomic aspect, were the hybrid combinations Bc741-23 x Bc742 and Bc741-5 x Bc742. These combinations are distinguished by yielding capacity, low harvest moisture and resistance to stalk rot and breakage. It was confirmed in the trials with lines and hybrids under the conditions of increased plant density, defoliation and artificial inoculation with Colletotrichum graminicola. Drought-induced stress favoured the onset of natural Fusarium stalk rot. Application of the method of increased stalk rot proved to be effective for testing lines. Line resistance to stalk rot needs to be tested also in hybrid combinations. The above investigations resulted in development of a new maize hybrid in maturity group FAO 500-BcEH 5982.

  4. Type of paper: Paper in journal

    Title: Resistance to stalk rot and combining ability of the selected Bc maize inbred lines (Zea mays L.)

    Authors:
    Palaveršić, Branko (73714)
    Rojc, Marijan (76091)
    Parlov, Dragomir (76111)
    Stastny, Karlo (73683)
    Kozić, Zdravko (95860)
    Brekalo, Josip (125712)
    Journal: Poljoprivredne aktualnosti
    Number: 3-4
    ISSN: 0350-6622
    Volume: 30
    Year: 1994
    Pages: from 319 to 327
    Number of references: 9
    Language: hrvatski
    Summary: Based on a field trial with maize inbred lines and three experiments with hybrid combinations, following scheme line x tester (5 x 4) at two locations, the new lines, Bc 741-38 D and Bc 471-23 were found to be considerably more resistant to Fusarium diseases and anthracnose stalk rot than the standard line A 619 Ht. Inbred lines Bc 19044, Bc 14603 and Bc 742 displayed appreciable resistance relative to the line Bc 14. Lines Bc 741-38, Bc 741-23 and Bc 742 exhibited better combining ability for grain yield. In terms of economic value, the best combinations were Bc 741-38 D x Bc 742 and Bc 741-23 x Bc 742. Owing to its resistance, the line Bc 19064 is recommended as a source of resistance to anthracnose and Fusarium stalk rot.

  5. Type of paper: Paper in journal

    Title: Comparison of in vitro calli weight gain and grain yield of some maize lines

    Authors:
    Buhiniček, Ivica (195150)
    Pavlina-Šutina, Renata (74221)
    Vasilj, Đurđica
    Rojc, Marijan (76091)
    Journal: Poljoprivredne aktualnosti
    Number: 3-4
    ISSN: 0350-6622
    Volume: 30
    Year: 1994
    Pages: from 277 to 282
    Number of references: 14
    Language: hrvatski
    Summary: Comparison of calli weight gain was made (of immature and mature maize embryos) after 21 plus minus 1 day of growing in vitro on MS substrate at 25 C in dark and grain yield of six maize inbred lines.Correlation coefficient (r)and Spearman's range coefficient (rs) were calculated for these traits. Correlative association between calli weight gain of immature maize embryos and grain yield was found to be very poor (r=0.22), whereas between calli weight gain of mature maize embryos and grain yield it was moderate (r=0.44*). Association between inbred line ranges for calli weight gain of immature maize embryos and grain yield was found to be somewhat closer (rs=0.26). Association between ranges of calli weight gain of mature maize embryos and grain yield was almost complete (rs=0.94**). One can assume from the results of the investigations that grain yield of inbred lines based on calli weight gain (especially in mature maize embryos), could be estimated better by means of range coefficients of both traits. However, for amore reliable estimate of this parameter, the investigations should be performed with a larger number of maize inbred lines involved.

  6. Type of paper: Paper in journal

    Title: Estimates of GCA and SCA for maize lines and hybrids in vitro and in situ based on Griffing's methods 2 and 4

    Authors:
    Buhiniček, Ivica (195150)
    Vasilj, Đurđica
    Pavlina-Šutina, Renata (74221)
    Palaveršić, Branko (73714)
    Journal: Poljoprivredna znanstvena smotra
    Number: 4
    ISSN: 0370-0291
    Volume: 59
    Year: 1994
    Pages: from 357 to 367
    Number of references: 12
    Language: hrvatski
    Summary: Results of GCA and SCA estimates were compared by using Griffing's methods 2 and 4 for diallel analyses (1956) for callus weight gain and four other traits in situ (grain yield at 14 % moisture (dt/ha); moisture (%); rotted plants (%) and broken plants (%)). Diallels were obrtained by crossing six maize inbred lines (A619, A632HtHt, Bc14, Mo17Rfc, Ra232 and W64AHt) of different origin. Results of F-tests for combining ability indicate that GCA and SCA variances are higher when method 2 was used rather than method 4 for all the investigated traits, except for GCA variance for grain yield. Inbred lines rank in GCA effect depended on the method of estimating GCA for callus weight gain, grain yield at 14 % moisture and number of rotted plants, while for grain moisture and number of broken plants no significant difference was noticed. For the traits in which estimation of SCA effects was possible by both methods, presence or absence of parants did not have any significant effect on estimates of SCA effects. Based on correlative coefficients (r) between GCA effects for the investigated traits for both methods callus weight gain was not significantly associated with any of the investigated in situ traits. Based on our investigations, method 4 seems to be giving a more realistic estimate of combining abilities than method 2 partly due to its somewhat more severe criterion for estimating combining ability significance.
    Keywords: maize (Zea mays L.), callogenesis, Griffing's methods

  7. Type of paper: Paper in journal

    Title: Quantitative analysis of callogenesis in immature and mature maize (Zea mays L.) embryos culture in vitro

    Authors:
    Buhiniček, Ivica (195150)
    Journal: Poljoprivredna znanstvena smotra
    Number: 2'3
    ISSN: 0370-0291
    Volume: 59
    Year: 1994
    Pages: from 155 to 169
    Number of references: 22
    Language: hrvatski
    Summary: Specific reactions of genotypes and heritability were investigated (1991 and 1992) together with callogenesis combining abilities (1992) of both immature and mature maize embryos, grown on MS substrate supplemented with 6 % sucrose, 0.8 % agar and 3 mg/l 2,4-D at 25 C in dark. All inbred lines formed calli, but callus fresh weight gains varied depending on the genotype, the muturity of embryo and the year of investigation. To estimate callogenesis heritability of immature and mature embryos, parental lines Bc10 and Bc 14 were crossed directly and reciprocally. Parental, F1 and F2 generations and backcrosses were grown in situ and in vitro. Heritability in the broad sense was estimated in three ways (I. from the parental (P1 and P2) and F2 generation; and II, III from the variances of P1, P2, F1 and F2 generations). Evaluation of heritability in the narrow sense was made only in one way (i.e. from the variances of backcrossing (B1 and B2) and from the variance of F2 generation). High values for heritability in the broad sense of the mature embryos, achieved by means of the first three methods suggest that highly heritable traits are here in question (Table 7,8), which cannot be said for the heritability of callogenesis of the immature embryos (Table 5,6). Combining ability for callus fresh weight gain for immature and mature embryos of 6 inbred lines were estimated after 21 plus minus 1 day of growth in vitro by the diallel analysis. Significant GCA and reciprocal effects were found in both embryo stages, and SCA effects in immature embryos.
    Keywords: maize, inbred lines, tissue culture, callogenesis, immature and mature embryos, heritability, general and specific combining ability, diallel crossing

  8. Type of paper: Paper in proceedings

    Title: Diallel analysis of callus weight in maize tissue culture (Zea mays L.)

    Authors:
    Buhiniček, Ivica (195150)
    Pavlina-Šutina, Renata (74221)
    Vasilj, Đurđica
    Rojc, Marijan (76091)
    Editors
    Motto, Mario
    Proceedings title: Proceedings of the XVIth conference of the Eucarpia Maize and Sorghum Section
    Language: engleski
    Place: Bergamo, Italija
    Year: 1993
    Pages: from 54 to 59
    Meeting: XVIth Conference on Breeding and Molecular Biology: Accomplishments and Future Promises (Maize and Sorghum)
    Held: from 06/06/93 to 06/09/93
    Summary: Quantitative evaluation of callus growth in vitro was studied. General combining ability (GCA), specific combining ability (SCA) and reciprocal differences of callus growth from immature embryo culture were evaluated. For this purpose a complete diallel was made of six lines of different origin (A619, A632HtHt, Bc14, Mo17Rfc, Ra232 and W64Ht). Significant differences were found in the growth of callus among inbred lines and F1 hybrids. The average fresh weight of callus among inbred lines varied from 0.1829 g (Ra232) to 0.7236 g (W64Ht). GCA effects varied from -0.1408 (Mo17Rfc) to 0.1186 (W64Ht). The average fresh weight of callus among F1 hybrids varied from 0.1684 g (Mo17Rfc x Bc14) to 0.9712 g (A619 x W64Ht), in comparison with thepopulation mean (0.5024 g) from 33.5 to 193.3 %. Hybrids with the highest SCA effects were A619 x W64Ht (0.0806), Bc14 x W64Ht (0.0969), A619 x Ra232 (0.1605) and A632HtHt x Ra232 (0.3298). Significant reciprocal effects were also found. Hybrids with the highest effect were W64Ht x Mo17Rfc (0.1949), Ra232 x A619 (0.2139) and Bc14 x A619 (0.2191).

  9. Type of paper: Paper in proceedings

    Title: Study of maize artificial stalk infection with Colletotrichum graminicola Ces. G.W. Wils.

    Authors:
    Brekalo, Josip (125712)
    Palaveršić, Branko (73714)
    Rojc, Marijan (76091)
    Buhiniček, Ivica (195150)
    Editors
    Bianchi, Angelo
    Lupotto, Elisabetta
    Motto, Mario
    Proceedings title: Proceedings of the XVIth Conference of the Eucarpia Maize and Sorghum Section
    Language: engleski
    Place: Bergamo, Italija
    Year: 1993
    Pages: from 272 to 282
    Meeting: XVIth Conference on Breeding and Molecular Biology: Accomplishments and Future Promises (Maize and Sorghum)
    Held: from 06/06/93 to 06/09/93
    Summary: Effect of artificial infection with Colletotrichum graminicola on stalk rot, grain moisture, yield and 1000-kernel weight was tested as well as their dependance of infection severity, in a split-plot trial with seven commercial hybrids, in two climatically different years. Significant differences in hybrid resistance were obtrained for the three different methods of evaluating stalk anthracnose. In the first year, artificial stalk infection with C. graminicola significantly increased stalk rot severity in all the tested hybrids, with the exception of the most resistant ones, Bc 492 and Podravec 36. Grain yield per plant was significantly reduced by artificial stalk infection in all hybrids. Significant interaction was obtained only in the first year, and yield reduction per plant was significant only in the most susceptible hybrid, Bc 488. Artificial infection lowered also 1000-kernel weight. This reduction was significant only for susceptible hybrids in the first year of testing, when the interaction was significant. Grain yield per plant most closely correlated with 1000-kernel weight and kernel number per ear. Negative correlation coefficients were obtained between yield and the three ways of evaluating anthracnose in both years, while they were significant only in the first year of testing. Increased infection severity (1-9) resulted in higher stalk rot attack, reduced yield per plant and lower 1000-kernel weight.

  10. Type of paper: Paper in proceedings

    Title: Comparison of two sources of resistance to maize stalk anthracnose

    Authors:
    Parlov, Dragomir (76111)
    Tomičić, Branimir (123664)
    Buhiniček, Ivica (195150)
    Palaveršić, Branko (73714)
    Brekalo, Josip (125712)
    Editors
    Bianchi, Angelo
    Lupotto, Elisabetta
    Motto, Mario
    Proceedings title: Proceedings of the XVIth Conference of the Eucarpia Maize and Sorghum Section
    Language: engleski
    Place: Bergamo, Italija
    Year: 1993
    Pages: from 364 to 371
    Meeting: XVIth Conference on Breeding and Molecular Biology: Accomplishments and Future Promises (Maize and Sorghum)
    Held: from 06/06/93 to 06/09/93
    Summary: On the basis of diallel analysis 6 x 6, values of local maize inbreds Bc9 and Bc10 were compared with the line SP288, as sources of resistance to maize stalk anthracnose. Resistant inbreds SP288, Bc9, and Bc10 had significantly negative, while the susceptile inbreds, Bc14 and Bc2923 had positive GCA effects for resistance to stalk anthracnose. also, significantly positive or negative SCA effects were found. All the three resistant lines proved to be effective sources of resistance to stalk anthracnose in combination with the inbred Bc 252, which is resistant to Fusarium rot. However, resistance of these three lines is considerably poorer in crosses with the inbreds Bc14 and Bc2923, which are also susceptible to Fusarium stalk rot. Breeding for resistance to stalk rot requires combination of resistance both to Fusarium and anthracnose stalk rot. The lines Bc9 and Bc10 represent valuable and genetically divergent sources of resistance to stalk anthracnose.

  11. Type of paper: Paper in proceedings

    Title: Relationship between several stalk rot ratings of maize inbreds

    Authors:
    Palaveršić, Branko (73714)
    Rojc, Marijan (76091)
    Brekalo, Josip (125712)
    Buhiniček, Ivica (195150)
    Editors
    Bianchi, Angelo
    Lupotto, Elisabetta
    Motto, Mario
    Proceedings title: Proceedings of the XVIth Conference of the Eucarpia Maize and Sorghum Section
    Language: engleski
    Place: Bergamo, Italija
    Year: 1993
    Pages: from 372 to 377
    Meeting: XVIth Conference on Breeding and Molecular Biology: Accomplishments and Future Promises (Maize and Sorghum)
    Held: from 06/06/93 to 06/09/93
    Summary: During two-year investigations, resistance of respectively 78 and 67 maize inbreds to stalk rot was compared, estimated in 6 different ways under conditions of artificial infection with Colletotrichum graminicola, Fusarium graminearum and natural stalk rot. High, significant and positive correlation coefficients were found between line resistance under artificial infection with C. graminicola expressed as the number of internodes showing signs of infection and the number of internodes with more than 75 % of area infected (r=0.88, 0.86). Resistance of maize inbreds to anthracnose estimated on the basis of outer stalk discoloration correlated with the two former rating methods in only on year (r=0.32, 0.38). No correlative association between the degree of line resistance to artificial infection with F. graminearum and natural Fusarium stalk rot was found (r=0.02, 0.19). Correlative association was found between the resistance of maize inbreds under conditions of artificial infection with F. graminearum and C. graminicola based on total number of internodes showing signs of infection (r=0.34, 0.59) and the number of internodes with more than 75 % of area diseased (r=0.51, 0.68). Resistance of maize inbreds under conditions of natural Fusarium stalk rot was found to be in correlation with the resistance to stalk anthracnose, based on outer stalk discoloration, which is a natural symptom of anthracnose, as a result of artificial stalk infection (r=0.60, 0.30).

  12. Type of paper: Summary in proceedings

    Title: Induction and heritability of somatic embryogenesis in embryo culture of maize (Zea mays L.)

    Authors:
    Pavlina-Šutina, Renata (74221)
    Proceedings title: Book of Abstracts XIIIth Eucarpia Congress
    Language: engleski
    Place: Angers, Francuska
    Pages: from 375 to 376
    Meeting: XVIth Conference on Breeding and Molecular Biology: Accomplishments and Future Promises (Maize and Sorghum)
    Held: from 07/06/92 to 07/11/92

  13. Type of paper: Summary in proceedings

    Title: Comparison of criteria and techniques in breeding maize for resistance to Fusarium stalk rot

    Authors:
    Palaveršić, Branko (73714)
    Rojc, Marijan (76091)
    Buhiniček, Ivica (195150)
    Warren, Herman L.
    Editors
    Nelson, Paul E.
    Proceedings title: Paper Abstract 13
    Language: engleski
    Place: University Park, Pennsyl., SAD
    Year: 1993
    Pages: from 35 to 0
    Meeting: VII International Fusarium Workshop
    Held: from 07/19/93 to 07/23/93
    Summary: During many-year investigations, no correlative association was found between resistance of maize lines and hybrids to stalk rot under conditions of artificial infection with Fusarium graminearum and natural attack of Fusarium stalk rot. Comparing two climatically different years, intensive onset of Fusarium stalk rot was found to occur in years with a stress due to a drought during the grain-fill period. By performing defoliation 21 days after silking, stress conditions were successfully duplicated and stalk rot on maize inbreds and hybrids increased. Higher plant densities and attack by leaf diseases were also the technique that induced high stalk rot severities. Testing maize inbreds with susceptible testers provided a clearer differentiation between the resistant and susceptible lines to stalk rot and breakage.

  14. Type of paper: Summary in proceedings

    Title: Comparison of two stalk rot enhancement techniques

    Authors:
    Palaveršić, Branko (73714)
    Brekalo, Josip (125712)
    Buhiniček, Ivica (195150)
    Proceedings title: Abstracts/Resumes
    Language: engleski
    Place: Montreal, Kanada
    Year: 1993
    Pages: from 88 to 0
    Meeting: 6th International Congress of Plant Pathology
    Held: from 07/28/93 to 08/06/93

  15. Type of paper: Summary in proceedings

    Title: Testing maize inbred lines for resistance to diseases relevant in seed production

    Authors:
    Palaveršić, Branko (73714)
    Brekalo, Josip (125712)
    Sever, Janko
    Proceedings title: XXXI. znanstveno stručno agronomsko savjetovanje
    Language: hrvatski
    Place: Pula
    Year: 1995
    Pages: from 42
    Meeting: XXXI. agronomsko savjetovanje
    Held: from 02/20/95 to 02/24/95
    Summary: During 13 years of obligatory sanitary field inspection, occurrence and severity of diseases in seed field with Bc hybrids was monitored in Croatia. For comparison, maize inbred lines were tested for disease resistance under conditions of artificial infection in Rugvica. Bipolaris zeicola (sin. Helminthosporium carbonum) was found to be an important disease as compared to Exserohilum turcicum (sin. Helminthosporium turcicum), while Kabatiella zeae and Colletotrichum graminicola were found mostly in traces. The highest severity of B. zeicola was found in seed parents Bc222, Bc665x Bc177, and Bc224 x Bc222, which agrees with high susceptibility of the lines in artificial infection. Comparatively high severity of E. turcicum was found in seed parents Bc190 x Bc189, and Bc665 x Bc177, developed by crossing susceptible lines and it was confirmed under conditions of artificial infection. In seed production, the highest severity of fusarium ear rot wasrecorded in seed parents Bc502 x Bc24, Bc665 x Bc177, and Bc176 x Bc70139. Under conditions of artificial ear infection with Fusarium graminearum, the line Bc177 was susceptible, Bc665 moderately susceptible, while under conditions of artificial infection with Fusarium moniliforme, the lines Bc546 and Bc172 were susceptible and the line Bc24 was moderately susceptible. The applied methods of artificial infection proved reliable in estimating line susceptibility in seed production

  16. Type of paper: Summary in proceedings

    Title: Study of maize resistance to ear rot under conditions of artificial infection with Fusarium graminearum

    Authors:
    Brekalo, Josip (125712)
    Buhiniček, Ivica (195150)
    Palaveršić, Branko (73714)
    Editors
    Visconti, Angelo
    Proceedings title: Fusarium, Mycotoxins, Taxonomy and Pathogenicity - Book of abstracts
    Language: engleski
    Place: Martina Franca, Italija
    Year: 1995
    Pages: from 126
    Meeting: International Seminar on Fusarium - Mycotoxins, Taxonomy and Pathogenicity
    Held: from 05/09/95 to 05/13/95
    Summary: In the first experiment, 12 maize single cross hybrids were compared for resistance to ear rot with their parental lines.In the second experiment, six maize inbreds and their 15 diallel crosses were also infected with Fusarium graminearum into the silk channel using a toothpick method. Considerable differences were obtained among the tested genotypes. Hybrids proved to be more resistant than the lines, with resistance to ear rot dominating. Effects of both general and specific combinig ability were justified. One line expressed remarkable GCA effects for resistance, two for susceptibility, while SCA effects were significant for four combinations. Hybrid resistance cannot be predicted solely by estimating resistance of the lines; it is necessary also to test combinations for their resistance.

  17. Type of paper: Summary in proceedings

    Title: Diallel analysis of maize resistance to Fusarium stalk rot

    Authors:
    Palaveršić, Branko (73714)
    Parlov, Dragomir (76111)
    Tomičić, Branimir (123664)
    Buhiniček, Ivica (195150)
    Editors
    Visconti, Angelo
    Proceedings title: Fusarium, Mycotoxins, Taxonomy and Pathogenicity - book of Abstracts
    Language: engleski
    Place: Martina Franca, Italija
    Year: 1995
    Pages: from 138
    Meeting: International Seminar on Fusarium - Mycotoxins, Taxonomy and Pathogenicity
    Held: from 05/09/95 to 05/13/95
    Summary: Six maize inbreds and their 15 diallel crosses were tested for resistance to Fusarium stalk rot under natural conditionsin 1993 and 1994. Significant effects of general (GCA) and specific (SCA) combining ability were obtained. The line Ra 232 had significant GCA effects for resistance to Fusarium stalk rot, and the lines Bc 14 and W 64 A for susceptibility. In both years, combinations Ra 232 x W 64 and Mo17Rfc x Bc 14 were distinguished by significant negative SCA effects. Grain yield of the tested maize hybrids was negatively correlated with the percent of rotted plants, while the percent of broken plants was positively correlated with percent of rotted plants. In some lines, resistance of lines per se did not agree with the GCA effects. Moreover, significant SCA effects indicate that it is necessary to test hybrid combinations for resistance to Fusarium stalk rot.

  18. Type of paper: Summary in proceedings

    Title: Combining ability of some new Bc maize inbreds

    Authors:
    Kozić, Zdravko (95860)
    Palaveršić, Branko (73714)
    Stastny, Karlo (73683)
    Tomičić, Branimir (123664)
    Vragolović, Antun (120703)
    Editors
    Gotlin, Josip
    Proceedings title: XXXI. znanstveno stručno agronomsko savjetovanje - sažeci izlaganja
    Language: hrvatski
    Place: Pula
    Year: 1995
    Pages: from 40 to 40
    Meeting: XXXI. agronomsko savjetovanje
    Held: from 02/20/95 to 02/24/95

  19. Type of paper: Ph.D.

    Title: Combining ability and heritability of resistance of certain lines of Zea mays L. to Colletotrichum graminicola (Ces) G.W. Wils.
    Faculty: Agronomski fakultet Sveučilište u Zagrebu
    Author: BREKALO JOSIP
    Date of defense: 03/24/95
    Language: hrvatski
    Number of pages: 105
    Summary: Artificial infection was used for testing 1625 domestic and foreign maize inbreds for resistance to leaf and stalk anthracnose. Eight remarkabliy resistant lines were selected: Bc9, Bc10, Bc19064, Sp288, H99, Mo17 which have already been referred in literature for their resistance. Two new inbreds, Zp3 and Zp4 were detected. These eight lines (L) were tested for resistance to leaf and stalk anthracnose in crosses with nine elite, commercial lines as testers (T), namely Bc14, Bc252, Bc2923, A632, A619Ht, B73, B84, C123 and F2. In both years of testing, the analysis of variance and F-test showed significant difference in all indices of resistance to leaf and stalk anthracnose for lines (L), testers (T) and crosses (LxT), except the (LxT) interaction for stalk breakage. The lines H99 and Mo17 displayed the poorest resistance to leaf and stalk anthracnose. The most resistant lines were Bc 19064, Sp288, Zp3 and Zp4 in one or more indices. Significant GCA and SCA effects were found both for resistance and susceptiblity, however, these values vary in different years for most combinations. Ratings of stalk anthracnose by the different methods were studied, namely total number of internodes, internodes with more than 75 % of infected tissue, outer discoloration (1-9) and percent of rotted and broken plants. Correlative associations among the different rating methods of resistance to stalk anthracnose indicated that outer discoloration is the best indication of resistance because it correlates most closely with stalk rot and is easy for application in practical selection. The pattern of inheritance of resistance to leaf and stalk anthracnose was studied for remarkably resistant lines Bc10 and Zp4 through populations of progenies (P-1, P-2, F-1, F-2, , BC-1, BC-2, partly BC-1S and BC2S) developed by crossing with several susceptible inbreds of different origin. The analysis of qualitative traits undoubtedly confirms monogenic pattern of inheritance of resistance to leaf and stalk anthracnose in the lines Bc10 and Zp4 in crosses with susceptible line Bc14. However, it was not confirmed in crosses with other susceptible inbreds (Bc2923, Bc252 and C123), which means that the dominant effect of alleles for resistance is dependent upon combination of crosses. In studying resistance to stalk anthracnose as a quantitative trait, populations of progenies from the same crosses were used as for leaf anthracnose. In the total phenotypic variance, the variance of the environment accounts for the greatest part, therefore, heritability in broad sense was in most crosses very samll, and in some moderate. Heritability in the narrow sense except for being very small, in many cases of crossing it was negative. In one cross it was biger than the heritability in the broad sense, which is a result of the negative parts of genotypic variances.
    Keywords: Zea mays L., Colletotrichum graminicola Ces G.W. Wils., general and specific combining ability, heritability


  20. Type of paper: M.A.

    Title: Quantitative analysis of in vitro callogenesis of immature and mature maize embryos (Zea mays L.)
    Faculty: Agronomski fakultet Sveučilište u Zagrebu
    Date of defense: 07/15/93
    Language: hrvatski
    Number of pages: 64



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