稻瘟病菌两个陆稻菌株的致病性遗传研究

 本文报道了94-84c（MAT1-1）和95-23-4a（MAT1-2）两个云南陆稻分离菌的杂交后代菌株的交配型及其在13个水稻品种上的致病性分离的研究结果。42个子囊孢子菌株与两个亲本菌株回交，共有78.6%的后代菌株在回交中产生了有性世代,其中MAT1-1的菌株22个,MAT1-2的菌株11个。致病性分离的结果则初步表明：94-84c菌株对楚粳17号、岫4-10、云粳135和春江06分别持有1个非致病性基因，对福锦、春江11、云粳34和腾糯2号则分别持有2个非致病性基因。95-23-4a菌株对半节芒/大红谷和大白谷分别持有1个非致病性基因。两个亲本菌株对丽江新团黑谷都不持有非致病性基因。

Inheritance of Avirulence/Virulence in a Cross of Two Isolates of Magnaporthe grisea Drived from Upland Rice Plant

A cross was made between two isolates, 94 84c (MAT 1 1 ) and 95 23 4a (MAT 1 2) ) of rice blast fungus Magnaporthe grisea that derived from upland rice plants.A total of 42 ascospore isolates were tested for mating type and cross fertility by backcrosses with their parents.78.6% of their progenies produced perithecia, 22 progenies were MAT1 1, and 11 progenies were MAT1 2. Tests on the Progenies for avirulence/virulence on 14 rice cultivars( lines) showed that avirulence on Chunjing 17, Xiu 4 10, Yunjing 135 and Chunjiang 06 was controlled by one gene from 94 84c, respectively; and avirulence on Fukunishiki, Chunjiang 11, Yunjing 34 and Tengnuo 2 was controlled by two genes from 94 84c respectively. But avirulence on Banjiemang/Dahonggu and Dabaigu was controlled by one gene from 95 23 4a respectively.