【摘要】 通过每 10年 1次对病原菌致病力分化的监测发现 ,国内稻区病菌小种的组成基本稳定 ,仅个别小种有所变化。目前流行的优势小种仍为C1和C2群 ,即携带有Xa3抗性基因的品种仍可广泛种植 ;但能够侵染Xa4抗性基因的C4、C5群小种的数量有所增加 ,即将达到流行的阈值。为便于与国内外小种鉴别的结果相比较 ,选用IRRI推出的几个近等基因系材料作为鉴别品种 ,将中国的白叶枯病菌区分为 8个小种 (C1～C8)。更多还原

【Abstract】 Based on inoculation test, six varieties (Jingang 30, IRBB3, IRBB4, IRBB5, IRBB14 and Java14) were selected as differential varieties for monitoring races of Xanthomonas oryzae pv. oryzae(Xoo) in China. Xoo population in China could be divided into eight races, named as C1 to C8, respectively. The races C1 and C2 were stable and predominant. Therefore, cultivars carrying resistant gene Xa3 could still be planted widely. The number of races C4 and C5 increased during the last 10 years. The resistance gene Xa4 will be arrested by the races C4 and C5. The genes xa5 and Xa7 showed qualitative resistance to all the races in China, and it is very important and valuable to introduce those genes for further breeding programe in China.更多还原