菜豆炭疽菌有性态研究

STUDIES ON TELEOMORPH OF COLLE TO TRICHUM LIN DEMUTHIANUM

在引起菜豆炭疽病的Colletotrichum lindemuthianum(sacc.et Magn.)Br.etCar.大量培养物中,发现一个在低温培养保存中丧失产生分生孢子能力而仅产生子囊壳的菌系。对其形态学、培养特征、单子囊孢子培养的研究及与有关种的形态比较结果表明,这个源于分生孢子的子囊菌培养物是菜豆小丛壳Glomerella lindemuthianum Shear。这个培养物经人工接种菜豆,再分离时首先产生无性态分生孢子,经数代培养又回复有性态,表明有性过程的产生是同宗配合的。这种有性与无性阶段之间的交替和联系,证明这是一个全型态真菌,即菜豆小丛壳G.lindemuthianum是无性态菜豆炭疽菌C.lindemuthianum的有性态。

In low temperature storage one culture of Colletotrichum lindemuthianum (Sacc. et Magn.) Br. et Cav., the pathogen of bean anthracnose, only produced perithecia but not conidia. The morphology, cultural character and monoascospore culture of the fungus was studied and compared with allied species. The result showed that this ascogenous culture isolated from conidia was Glomerella lindemuthianum Shear. The ascospore infected bean leaves by antificial inoculation, and the sympton was the same as that of C. lindemuthianum. In reisolation of pathogen, anamorphic conidia was first produced in culture, but teleomorph recovered soon after for several generations. The fact proved that the fungs was homothallic. The alternation and relation between perfect and imperfect stages indicated that this fungus was a holomorph: G. lindemuthianum was the teleomorph of C. lindemuthianum which was the anamorph.