Kan thaithot laksana tanthan rok anthracnose stalk rot nai khaophot.
1985
Uthaiwan Akkaravatewattana
Diallel analysis of 45 F1 hybrids showed significant general combining ability (GCA) variances in reactions to stalk rot. From the study of relationships, the rank values indicated the high relationship between rank value for mean of F1's reaction and general combining ability of inbred lines (r subscript s = 1.00). The distribution of total number of discolored internodes in F2 hybrids indicated that resistance to ASR was controlled by recessive genes. Preliminary genetic analysis was conducted by using a chi-square test. It illustrated the importance of additive gene effects in controlling the resistance to this diseases in corn under this study. Analyses of generation means of nine sets of crosses: TP 105-1 x Ki 17, TP 297-1 x Ki 17, Lote 26 x Ki 17, WF 9-2 x Ki 17, Ki 3 x TP 267-1, Ki 11 x TP 267-1, TP 105-1 x TP 267-1, TP 297-1 x TP 267-1 and WF 9-2 x TP 267-1 for each with six generations namely P1, P2, F1, F2, BP1 and BP2. These indicated that not only additive gene effects but also non-additive gene effects including dominance gene and epistatic effects were significant in some crosses. However, additive gene effects were responsible for most of the heredity of resistance to ASR.
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