落叶松褐锈病的研究锈寄生菌的形态特征及其萌发生理

 落叶松褐锈病的重寄生菌经鉴定为锈寄生菌[Darluca filum(Biv.)Cast.],寄生在褐锈病菌冬孢子堆上。它的分生孢子萌发喜低温,萌发温度范围2-27℃,适温4-12℃。不同营养液对分生孢子萌发速率各异,5%葡萄糖及蒸馏水滴中萌发率较高,2.5%硫酸铵液滴中不萌发。pH值对分生孢子萌发也有影响,pH9萌发较好,偏碱性pH9下不萌发。
锈寄生菌对褐锈病菌有较强的杀伤性能,被寄生的冬孢子以上失去发芽力且逐渐破碎乃至消失。因此,它将为落叶松褐锈病的生物防治提供依据和可能。

ON LARCH RUST Triphragmiopsis lavicinum (Chou) Tai--MORPBOLOGY AND GERMINATING PHYSIOLOGY OF THE RUST HYPERPARASITE

The hyperparasite of larch rust of Triphragmiopsis laricinum was identified as Darluca filum (Biv.) Cast.parasitizing in the teliospore mass of Triphragmiopsis laricinum.
Conidia of Darluca filum germinate at low temperature,range of 2-27℃,with optimum 4-12℃.Different nutrient solution has different influence on germination of conida.High percentage germination produced in 5% glucose solution or distilled water.No germination occured in 2.5% ammonium sulfate,pH also has some influence on germination,Conida germinate very well at pH6,but non above pH9.
Darluca filum has high antagonistic effect on Triphragmiopsis laricinum,Teliospres parasitized by 80% and above can lose germinating ability.These spores may be gradually destroyed,even disappeared.It may be taken as abase for biological prevention research of Triphragmiopsis laricinum.