Thirty isolates of Magnaporthe grisea collected from 18 provinces/cities representing 21 pathotypes and 9 different lineages were inoculated to rice varieties with known resistance genes and some hybrid rices, convent...Thirty isolates of Magnaporthe grisea collected from 18 provinces/cities representing 21 pathotypes and 9 different lineages were inoculated to rice varieties with known resistance genes and some hybrid rices, conventional early indica and late japonica varieties cultivated recently in China. Virulence spectrum of the 30 isolates was very different, showing that they recognize numerous different resistance genes. Varieties also revealed very different resistance patterns showing that they carry different resistance genes or combinations of resistance genes. On the basis of comparisons with international differential varieties with known resistance genes, resistance genes in certain Chinese varieties could be speculated. The results indicated that some of them were resistant to most of the isolates tested and that they could be of interest as resistance sources for hybrid parents or to be planted in the field directly.展开更多
The growth period duration of indica-japonica hybrid rice is often very long, which made it difficult to select fine suitable crosses for double seasonal hybrid rice. Using male sterile line Zaoxian A with a dominant ...The growth period duration of indica-japonica hybrid rice is often very long, which made it difficult to select fine suitable crosses for double seasonal hybrid rice. Using male sterile line Zaoxian A with a dominant earnness gene as a parent could reduce growth period duration for about 17 days, while grain yield might not decrease significantly.展开更多
文摘Thirty isolates of Magnaporthe grisea collected from 18 provinces/cities representing 21 pathotypes and 9 different lineages were inoculated to rice varieties with known resistance genes and some hybrid rices, conventional early indica and late japonica varieties cultivated recently in China. Virulence spectrum of the 30 isolates was very different, showing that they recognize numerous different resistance genes. Varieties also revealed very different resistance patterns showing that they carry different resistance genes or combinations of resistance genes. On the basis of comparisons with international differential varieties with known resistance genes, resistance genes in certain Chinese varieties could be speculated. The results indicated that some of them were resistant to most of the isolates tested and that they could be of interest as resistance sources for hybrid parents or to be planted in the field directly.
文摘The growth period duration of indica-japonica hybrid rice is often very long, which made it difficult to select fine suitable crosses for double seasonal hybrid rice. Using male sterile line Zaoxian A with a dominant earnness gene as a parent could reduce growth period duration for about 17 days, while grain yield might not decrease significantly.
