林芝地区小麦条锈菌转主寄主小檗的鉴定与分布

Investigation on geographic distribution and identification of six Berberis spp.serving as alternate host for Puccinia striiformis f.sp.tritici in Linzhi,Tibet

西藏自治区是我国小麦条锈病发生与流行相对独立的一个区系,小麦条锈病是严重影响西藏小麦安全生产的重要病害之一,林芝地区是西藏自治区小麦条锈病重要的常发区和流行区。已有研究证实,小檗是小麦条锈菌的转主寄主之一,并在我国小麦条锈菌致病性变异产生新菌系和小麦条锈病的发生过程中起作用。林芝地区小檗种类较多,但目前对林芝地区小檗是否能作为小麦条锈菌的转主寄主缺乏相关的研究和报道。本文针对小麦条锈病常发区的西藏林芝地区小檗资源进行了调查,对小檗能否作为小麦条锈菌转主寄主进行了鉴定。结果表明6种小檗在林芝地区常见且分布广泛,均是小麦条锈菌的转主寄主。这对进一步研究西藏小麦条锈病的发生、流行与病原菌致变性变异起着重要作用。

Tibet Province is an independent epidemic area for wheat stripe rust in China. The wheat stripe rust is one of the most destructive diseases on wheat, affecting safe production of wheat in Tibet. Linzhi prefecture has been considered an area where wheat stripe rust occurs frequently and is serious epidemic. It was verified recently that Berberis spp. serve as alternate host for Puccinia striiformis f. sp. tritici （the causal fungus of wheat stripe rust, Pst）, playing a role in resulting in variation in pathogenicity to produce new Pst races and in occurrence of the disease in China. Linzhi has a distribution of plenty of Berberis spp., however, it is lack of studies on Ber- beris spp. severing as alternate host for Pst in Linzhi prefecture so far. In this study, whether Berberis spp can serve as alternate host for Pst were identified based on investigations on Berberis spp. in Linzhi, Tibet where wheat stripe rust occurs frequently. The results showed that six Berberis spp. are very general in geographic dis- tribution, and were identified to serve as alternate host for Pst. This provides a basis for further studying on oc- currence and epidemics of wheat stripe rust, pathogenic variation of Pst, and perfecting integrated control of the disease in Tibet.