Generation mean analysis of resistance to white rust in Indian mustard
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Authors
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Divya Prakash
Department of Genetics and Plant Breeding, Faculty of Agriculture, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
Author
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B Sinha
Department of Genetics and Plant Breeding, Faculty of Agriculture, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
Author
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Kartikeya Srivastava
Department of Genetics and Plant Breeding, Faculty of Agriculture, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
Author
Keywords:
Epistasis, gene interaction, GMA, Indian mustard, white rustAbstract
White rust is an economically important disease of oilseed Brassicas and generation mean analysis of three crosses was
done to study the nature and magnitude of gene action governing resistance to this disease. Simple additive(d)-
dominance(h) model could not explain the genetics of white rust resistance suggesting the presence of non-allelic gene
interaction. The estimates of additive × additive (i), additive × dominance (j) and dominance × dominance (l) gene effects
were significant for the crosses Varuna × BioYSR and Kranti × Heera, however barring additive × dominance (j) gene
effect, all other gene effects were significant for the cross RH 749 × BioYSR. The magnitude of non-fixable gene effect
(h+l) was greater than fixable gene effect (d+i) for all the crosses. The opposite sign of h and l suggested presence of
duplicate gene action for white rust resistance in all the crosses. The magnitude of broad sense heritability was high in
all the crosses with desirable mid-parent heterosis.
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