红花锈病菌Puccinia carthami Cda.的孢子阶段及生活史研究

 用本地感病的红花品种,对P.carthaml的孢子阶段和生活史进行了研究.结果指出,种子经冬孢子粉拌菌后播种,幼苗罹病后在同一块病斑上先后产生性孢子、夏孢子和冬孢子。明确了性子器后发育生成的孢子防段为初生夏孢子.为此P.carthami应归属为单主寄生,缺锈孢型锈病菌.

SPORE STAGES OF PUCCINIA CARTHAMI CDA AND ITS LIFE CYCLE

This paper deals with the rust fungus on native susceptible safflower varieties.The spore stages and the life cycle pattern of puccinia carthami have been carefully observed and studied.The result indicates that when safflower seedlings was first infected after sowing the seeds dusted with teliospores of P.carthami,the sympotoms appeared.On the disease spot was present a series of spore forms,which were pycnia,primary uredinia and telia.According to the ontogeny of the rust fungus and by the comparison of different kinds of the spore morphogenesis,it has been identified that the spore form developed after pyenia ought to be regarded as the primary uredinial stage,not the aecium.Thus,P.carthami must be attributed to an autoecious,brachyform rust fungus.