| 【Objective】The types of rice varieties are diverse and complex. Scientific, reasonable, and accurate
evaluation of the good rice varieties is of great significance for the selection of excellent varieties and their application and
promotion. The data from five-years regional trials of conventional rice varieties in Guangdong Province was used to analyze the
selection of varieties resistant to rice blasts and the use of resistance sources of rice blasts in Guangdong province.【Method】
The identification results of resistance to rice blast in early and late rice varieties that participated in regional trials in Guangdong
Province from 2011 to 2115 were used, and the resistance of 149 rice varieties and parents of resistant varieties were analyzed to
explore the resistance characteristics of tested varieties to rice blast in Guangdong.【Result】According to the data results, it
was found that among 149 varieties, 84 varieties had resistance to rice blasts above resistance level, a proportion of 56.4%, and
22 varieties were lower than susceptible level, accounting for about 14.8%. There were a total of 43 varieties above susceptible
level as well as lower than resistance level, accounting for 28.9%. It shows that, in recent years, most of the varieties approved inGuangdong province have resistance to rice blast, and breeding units are paying more attention to rice blast resistance breeding and
the use of germplasm resources resistant to rice blast.From the analysis on the resistance source of rice blast, 28 Zhan and Qingliu’ai
1 are the two main rice blast resistant parents, which have derived up to 42 new rice varieties, accounting for 77.8% of the rice blast
resistant varieties. They have become two major resistance sources for the breeding of conventional rice resistant to rice blast in
Guangdong Province. 【Conclusion】According to the analysis on resistance sources of rice blast resistance cultivars, it shows that
the selection of appropriate parents is very important for breeding new varieties resistant to rice blast. |
