营养物质对两种炭疽菌潜伏侵染的影响

通过不同浓度的几种糖类对潜伏侵染在青香蕉果实中的colletotrichum musae和芒果果实中的colletotichum gloeosporioides的菌体的影响进行了测定,结果表明,高浓度淀粉可极显著地提高两种炭疽菌的孢子萌发率,并有利于附着胞和分生孢子的形成。单糖和二糖在较低浓度时有利于孢子萌发和产孢,不利于附着胞形成。未成熟果实的坚硬结构和高淀粉含量为病菌提供了以附着胞形式潜伏侵染在寄主中的条件。

EFFECTS OF NUTRIENTS ON LATENT INFECTION OF TWO SPECIES OF COLLETOTRICHUM CORDA

An attempt was made to determine the effects of various concentrations of five sugars on Colletotriehum Corda in banana and mango fruits. The results show that an exogenous supply of starch increased very obviously conidial germination and favoured appressorium formation and sporulation. Monose and disaccha-ride at lower concentrations were conductive to conidial germination and sporulation and not appressorium formation. The hard structure and higher content of starch in the immature fruits provided conditions of latent infection for phytopathogen producing appressoria.