Indian Society of Genetics & Plant Breeding

Genetic analysis of resistance to spot blotch (Bipolaris sorokiniana) in wheat

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Diallel analysis of spot blotch resistance was laid out
involving six resistant and two susceptible genotypes of
spring wheat of diverse origin in order to evaluate their
general combining ability (GCA) and specific combining
ability (SCA). The parents chosen showed wide variation
for area under disease progress curve (AUDPC) of spot
blotch. GCA and SCA effects were statistically significant
for AUDPC score suggesting that additive as well as nonadditive genetic mechanisms were involved in the
expression of resistance in these parents. Wheat
genotypes Chirya-3, Shanghai-4, Suzhoe 128-OY, Suzhoe
1-58, Longmai and Cuanmai#18 had significantly negative
GCA effects for AUDPC in F1 generations, suggesting their
prime suitability for use in wheat breeding programs to
improve resistance to spot blotch. The estimate of narrowsense heritability was 0.69 whereas broad-sense
heritability was 0.92 in F1s. The results indicated
predominance of additive gene action in the inheritance
of spot blotch resistance in spring wheat.

Keywords: Combining ability, diallel, spot blotch, resistance, wheat, AUDPC


Year: 2010
Volume: 70
Issue: 1
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906


S. M. S. Tomar and S. Chowdhury info_circle

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