唐松草作为小麦叶锈菌的转主寄主问题的研究

ON THE PROBLEM OF THALICTRUM ACTING AS ALTERNATING HOST OF PUCCINIA RECONDITA F. SP. TRITIEl

1984年在内蒙古卓资县白石头沟野外调查中发现4种唐松草和5种禾本科杂草都发生有叶锈病。但无迹象表明该地区自然界唐松草上发生的叶锈病与小麦叶锈病有关。在室内用小麦、华北剪股颖和无芒雀麦叶锈菌的冬孢子对亚欧和瓣蕊唐松草接种,都长出了锈孢子腔和锈孢子。用三种锈孢子分别对小麦、华北剪股颖和无芒雀麦回接,都产生了夏孢子,完成了生活循环。从此得出结论:亚欧和瓣蕊唐松草是小麦、叶锈菌的转主寄主,但在室外不起作用。而田间所见唐松草上的锈病主要与杂草上的锈病有关。

Thalictrum spp. heavily infected with rust was found in Zhuo-zi County, Inner-Monglia in 1984. Four species of Thalictrum and different five kinds of gramineous grasses in the vicinity of Thalictrum were infected with leaf rust. No evidence was obtained that occurrence of leaf rust on Thalictrum was related to wheat in field. Inoculation on Thalictrum with teliospores of leaf rust of wheat, Agrostis clavata and Bromus inermis respectively resulted in good aeciospores production on wheat, Agrostis and Bromus with ae-ciospores produced on the inoculated Thalictrum was also successful, and the life cycle of the pathogen was completed. The fact that Thalictrum is an alternating host of Puccinia recondita f. sp. tritici, but does not functioned in nature leads to the conclusion that it is unnecessary to eradicate the wild alternating hosts and lots of money can be saved.