小麦印度腥黑粉菌与近似种的形态学比较*

利用光学显微镜和扫描电镜对小麦印度腥黑粉菌及其近似种的形态学特征进行了系统研究。T. indica和T. horrida不同菌株冬孢子大小变化范围均较大。在所研究的种中,T. indica与T. walkeri最近似,前者冬孢子大小平均值比后者略大,分别为:38.35?5.92祄和32.86?1.53祄。T. indica与其它具有疣状或刺状突起的腥黑粉菌:T. horrida, T. barclayana, T. setariae, T. opaca, T. sumatii和T. savilei等区别明显,T. indica冬孢子大小平均值明显大于这些腥黑粉菌,前者大于30祄,后者则小于30祄, T. indica孢壁纹饰与这些腥黑粉菌也有一定区别。应用光学显微镜和扫描电镜,能将T. indica与除T. walkeri之外的其它近似种区别开,但在区别T. indica与T. walkeri方面则有一定的局限性。

COMPARATIVE MORPHOLOGY OF TILLETIA INDICA AND ITS RELATED SPECIES

A comparative morphological study of wheat karnal bunt, Tilletia indica, and its similar species was made by examining their teliospores under LM and SEM . Considerable variations in the range of teliospore size were observed between isolates of T. indica and between isolates of T. horrida, rice kernal smut. Among the similar species studied, T. indica was found to be the most similar to ryegrass smut, T. walkeri, but notably different from T. horrida, T. barclayana, T. setariae, T. opaca, T. sumatii and T. savilei. Practically, T. indica could be easily separated from T. horrida , T. barclayana, T. setariae, T. opaca, T. sumatii and T. savilei by its obviously larger teliospore size(the average teliospore size is >30mm for T. indica as against <30mm for the others). Under LM and SEM, T. indica and T. walkeri seem indistinguishable because of similarities of average spore size and exospore ornamentation, and the other distinguishing method seems needful.