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Journal of Biological Sciences

Year: 2004 | Volume: 4 | Issue: 1 | Page No.: 62-71
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ABSTRACT

In two tests, 108 and 96 F3 lines derived from a cross of rice varieties, Nipponbare (japonica) and Juma (indica) were used for gene analysis of lesion size and lesion number as components of field resistance to blast, respectively. Blast isolate, Ken 54-20 was used in evaluating disease resistance of the hybrid population. Nipponbare showed a small number of large lesions and Juma showed a large number of small lesions in one of the two tests. F3 plants with higher levels of resistance (evaluated as; highly resistant) than their parents were observed in some lines. Resistances were evaluated on individual plant basis and divided into four reaction types, R, N (Nipponbare type, small lesion number), J (Juma type, small lesion size) and S (susceptible). Resistances in three classes, R, R+N and R+N+J, were analyzed by the cumulative frequency distribution curve method. To explain these three types of segregations, three genes (controlling inhibition of lesion size and number) with minor effect were assumed: AACC in Nipponbare and BB in Juma. Additive effect of these three genes, AABBCC, was considered for explaining R type resistance, AACC for N type field resistance and BB for J type field resistance. But in another test (Test 2) with different F3 segregating lines derived from the same F1, resistance was explained by BBDD genes in Juma and EE gene in Nipponbare. This suggests that at least one gene in Nipponbare was not expressed in Test 2, indicating of epistatic change of gene action between the tests. There was no association between seed sterility and blast resistance, although there was an association between color of the basal leaf sheath and seed sterility. This means that genes responsible for seed sterility are not linked with blast resistance genes.
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