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Genetic analysis of grain mould resistance in coloured sorghum genotypes

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Abstract

Grain moulds are a major constraint to sorghum production and to adoption of improved cultivars in many tropical areas. Information on the inheritance of grain mould reaction is required to facilitate breeding of resistant cultivars. The genetic control of grain mould reaction was studied in 7 crosses of 2 resistant sorghum genotypes. P1, P2, F1, F2, BC1 and BC2 families of each cross were evaluated under sprinkler irrigation for field grade and threshed grade scores and subjected to generation mean analysis. Frequency distributions for grain mould reaction were derived and F2 and BC1 segregation ratios were calculated. Grain mould reaction in crosses of coloured grain sorghum was generally controlled by two or three major genes. Resistance to grain moulds was dominant. Significant additive gene effects were also found in all cross/season combinations. Significant dominance effects of similar magnitude to additive effects were also observed in five out of ten cross/season combinations. Gene interactions varied according to the parents with both resistant and susceptible parents contributing major genes. Choice of parents with complementary resistance genes and mechanisms of resistance will be critical to the success of resistance breeding.

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Authors and Affiliations

  1. Sorghum Breeding Unit, International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, 502 324, India

    S. Audilakshmi, J.W. Stenhouse & T.P. Reddy

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  1. S. Audilakshmi
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  2. J.W. Stenhouse
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  3. T.P. Reddy
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Audilakshmi, S., Stenhouse, J. & Reddy, T. Genetic analysis of grain mould resistance in coloured sorghum genotypes. Euphytica 116, 95–103 (2000). https://doi.org/10.1023/A:1004145024022

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