- 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
- 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.
- 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.
- 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.
- 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.
- 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
- 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
- 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).
- 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.
- 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.
- 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).
- 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
- 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.
- 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
- 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
- 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.
- 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.
- 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
- 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
- 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