• G. S. Khush

      Articles written in Journal of Genetics

    • A new gene for resistance to green leafhopperNephotettix virescens (Distant) in rice

      M. U. Ghani G. S. Khush

      More Details Abstract Fulltext PDF

      The mode of inheritance of resistance to green leafhopper in 12 cultivars of riceOryza saliva L. was studied. Seedlings of parent and hybrid populations were artificially infested with second- and third-instar virus-free green leafhopper nymphs. Seedling reaction was scored when TNI, the susceptible check, was completely killed. The results revealed that single dominant genes confer resistance in six varieties, two independent dominant genes in four varieties, and single recessive genes in two varieties. The single dominant genes in Sri Gaya, ARC 7320, and T23 and one of the two genes in Aswina and Bhura Rata 2 are allelic toGlh-1; while Bhawalia hasGlh-5 gene. The second gene of Bhura Rata 2 is allelic to IR28 gene. Resistance in Chamar is controlled by two independent genes one of which is allelic toGlh-5 and the other allelic to IR28 gene. Bazal hasGlh-2 andGlh-5. The single recessive gene in ARC 7012 is allelic toglh-4 but the single recessive gene in DV85 is nonallelic to and independent ofglh-4. This new recessive gene is designated asglh-8. The single dominant genes of Dumai, Gadur, and the second gene of Aswina are nonallelic to all the known genes for resistance.

    • Genetics of gel consistency in rice (Oryza sativa L.)

      S. X. Tang G. S. Khush B. O. Juliano

      More Details Abstract Fulltext PDF

      Inheritance of gel consistency in rice was studied in crossés involving highamylose, low-gelatinizalion temperature parents with hard, medium, and soft gel consistency. The results of single-grain analysis of parents, F1, F2, B1F1, B2F2, and their reciprocal crosses from a single-season harvest showed that the differences between hard and soft, hard and medium, and medium and soft gel consistency are under monogenic control and that modifiers affect the expression of the trait. Multiple alleles at the same locus, hereby designated asgeca for medium gel consistency andgecb for soft gel consistency, were recessive to the wild type allele for hard gel consistency andgeca was dominant overgecb. The results indicate that selection for desired gel consistency can effectively be done in early segregating generations.

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