Studies on Transfer of Bacterial Blight Resistant Genes of Indica-Japonica Crosses in Oryzae sativa L

Studies on Transfer of Bacterial Blight Resistant Genes of Indica-Japonica Crosses in Oryzae sativa L

Studies on Transfer of Bacterial Blight Resistant Genes of Indica-Japonica Crosses in Oryzae sativa L

Abstract

A rice (Oryzae satiua L) indica bacterial blight (BB) resistant variety
DV85 was crossed with japonica wide compatibility varieties (WCVs), and
results showed that their compatibilities were very poor and the resistant genes
in F, significantly biased away from normal segregated values by the x2 test at
the 1% level. This distorted segregation was not related to spikelet fertility,
panicle length, grains per panicle and 1000-grain weight by correlation analyses.
Four resistant derived lines to BB have been obtained by an anther culture tech-
nique. ZD92147 was resistant to Chinese races 1, 3, 4 and Philippine races 1-5
and moderately resistant to Chinese races 2, 5 and Philippine race 6. ZD92152
was resistant to Chinese races 1, 4, Philippine races 1, 2, 3, 5 and moderately
resistant to Chinese races 2, 3 and Philippine races 4 and 6. Their resistances
equalled or exceeded the level of DV85 and were much better than check variety
‘Xiushui 11’. The F, of japonica-biased resistant plants of japonica
WCVs x DV85 was anther cultured, and results showed that it is a more conve-
nient and effective breeding method than ordinary breeding methods to transfer
BB resistant genes in wide crosses. The four derived lines indica-japonica behav-
iours were also studied. ZD92147 and ZD92149 belong to japonica, ZD92150
belongs to the indica-japonica middle type, while ZD92152 belongs to indica.

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