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Sudan Journal of Agricultural Research

A study of diallel crosses between cultivars of cotton for bacterial blight resistance

A. M. Mustafa

Abstract:

Inheritance of resistance to Xanthomonas campestris pv. malvacearum was investigated using a half diallel cross between six cotton cultivars. Cotyledons of parents and their F1 progenies were inoculated in the greenhouse with the Sudan new isolate (Post-Barakat). Disease reactions were rated on a scale 1-10. Both additive and dominance effects were important in bacterial blight resistance. Recessive genes acted towards increasing resistance. Non-allelic gene interaction was not observed. Non-additive genetic variance was larger than additive genetic variance, and the mean degree of dominance was 1.5. The broad and narrow sense heritabilites were as high as 91.4 and 58.4 respectively. The results showed that Barac (67) B and S295 cultivars are good combiners in throwing better recombinations. Selection for resistant lines could be performed in early generations.
 

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Sudan Journal of Agricultural Research Vol. 8 (2007) PP. 59-64