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来源于小斑病菌同一菌株、同一菌落的不同单孢系和同一病斑的不同单斑系,无论在当代或后代,在菌落生长速度,拟菌核和菌落局变的出现产孢力及分生孢子和菌落的形态等各方面,都存在着一定差异、但是互相间没有明显的相关性。单孢系和单斑系继代培养到10代以后,多数性状有显著变化,特别是产孢量明显减少,有的甚至失去产孢力,但两者后代所致病斑长度的变化不大。另外,能否产生菌核及每根孢子梗上产生孢子的数目,不是菌系的一个稳定性状。经50代继代培养结果,单斑系后代性状变化比单孢系稍小、而较稳定,因此在研究小斑病菌、包括研究小斑病菌的生理小种,采用单斑系来代替单孢系比较有利。应用人工培养基上的培养物以不超避10代为宜。
Spores derived from the same strain of Alternaria solani, different monosporas of the same colony, and different single stains of the same lesion, both in terms of colony growth rate, pseudomonas and colony, both in contemporary and offspring Spores and colony morphology and other aspects, there are some differences, but no significant correlation with each other. After 10 generations of single and single stains subculture, most of the traits changed significantly, especially sporulation and spore loss, but the change of lesion length between the two generations was not significant . In addition, the ability to produce sclerotia and the number of spores produced on each spore number, not a stable strain of bacteria. After 50 generations of subculture, the traits of single-leaf offspring changed slightly smaller than that of monospora, and were more stable. Therefore, in the study of Alternanthera philoxeroides, including the physiological races of Alternaria solani, Department is more favorable. Application of artificial culture medium to avoid over 10 generations is appropriate.