Abstract:

In order to clear the difference of false smut resistance and the correlation with plant type trait, false smut resistance of 427 new rice combinations (lines) from the middle and lower Yangtze River and Hunan rice regional trials were studied by natural infection and artificial inoculation. The results showed that: the difference was significant among combinations (lines) of resistance from different resources, to the resistance, the rate of the middle and lower Yangtze River regional trials combinations (lines) was higher than the Hunan, the former was 16.4%, and the later was 3.1%, to the middle susceptible, the former was lower, to the susceptible and high susceptible, the former was higher. The difference was significant among combinations (lines) of resistance from various ecotypes, the order of resistance was middle indica > late double-season indica > late singe-season japonica > late single-season indica. This was the first report on the correlation between plant type trait of high quality late indica combinations (lines) and false smut, the results showed that height and spike length was not associate with disease spike rate, panicle characters except spike length were significantly positively associated with the disease spike rate and the order of correlation between the grain density > numbers of grain > numbers of secondary branch > numbers of primary branch. Among 6 Hunan large scale planted high quality late indica cultivars, only ‘Nongxiang 18’ showed resistance to false smut.