西藏条锈菌大麦专化型生理专化研究

A RESERCH ON PHYSIOFIC SPECIALIZATION OF Puccinia striiformis f.sp.hordei IN TIBET

1984至1987年,研究了采自西藏40多个县72个大麦品种上的317个条锈菌株的生理专化问题;结果表明条锈菌大麦专化型内毒性组成是复杂多样的。初步筛选出喜玛拉6号、矮秆齐、永1394、永802和科品2号等鉴别品种;以果洛为对照和繁殖母株品种。可将大麦条锈菌毒性区分为TBYR_0—TBYR_7等8个类型,以毒性中等偏弱的TBYR_3类型占优势。发现大麦条锈菌毒性类型的区域分布特点,提出了对最适流行区进行毒性变异的监测、抗性基因的合理布局,以利于西藏全区大麦条锈病的综合治理。

Research on he physiologic specialization of Puccinia striiformis f.sp. hordei, for 317 rust isolates Collected from 72 barley varieties in Tibet was conducted in 1984-1987,It is reve Rled that the rust fungi were a complex population with various types of virulence.A set of differential barley varieties was selected, (Himalaya No.6, Aigangqi. TBH1394, TBH802 and Guoluo was used as the susceptible check and isolate propagating cultivar. Eight types of virulences , designated as from TBYR0 to TBYR7 (TBYR = Tibetan Barley Yellow Rust) were differentiated.Type TBYR3, virulent to only H1malaya No.6 and Aigangqi, was the most prevalent type, followed by TBYR2 and TBYR4. Virulent types showed patterns of regional distribution, suggesting that the temperate and humid regions including Lingze, Chayu, Bomi, Milin, Jiacha, Yadong and other lower altitude regions were important epidemiologic areas.A rational deployment of resistance genes in this area would greatly coutribute to the integrated control of barley yellow rust in Tibet.