油菜菌核病菌生理生态研究

THE PHYSIOLOGY AND ECOLOGY OF SCLEROTINIA SCLEROTIORUM IN RAPE

通过试验分析，结果得出，油菜菌核病菌生长温度范围在0～34℃之间，23℃以下菌丝生长速度与温度呈正相关，25℃以上则呈负相关，23～25℃最适宜，菌丝和菌核致死温度分别为45℃和75℃．该菌对酸碱度适应范围很广，PH1～14范围内只在PH_1条件下不能生长，其最适PH值为5～6。病菌利用铵态氮源能力最强，硝态氮源次之，不能利用亚硝态氮；对氨基酸利用能力以精氨酸最强，其次是酪氨酸、天门冬氨酸和谷氨酸，赖氨酸最差。植株内精氨酸和赖氨酸比值大的白菜型油菜“黄鳝籽”病情扩展最快。

According to the determination showed that the results as follows:The temporature tange for growth of Sclerotinia sclertiorum was 0-34℃,in which,23-25℃ was the most optimum.The growth speed of hypha was related straightly to temperature be1ow 23℃,but negatively above 25℃,The lethal temperature for hypha and sclerotinia was 45℃,75℃respectively.The fungus could gtow except PH 1,but PH 5-6 was the most favorable.NH_4^+ -N could be assimilated most effectively,NO_3^-N followed,but NO_2^- - N couldn't used.Among all amino acids,Arg would be used mostly,Tyr,Asp and Gln followed,but Lys was worst.'Huang Shanzi'Rape contained the larger ratio of Arg to Lys has a raphid expand of disease.