外生菌根菌丝桥在板栗幼苗间传递磷的效应

采用^32P示踪和4室根箱方法研究了外生菌根菌丝桥对板栗磷营养和植株间磷素传递作用的效应。给一株板栗幼苗(供体)接种外生菌根真菌美味牛肝菌(Boletus edulis)、褐环乳牛肝菌(Suillus luteus)，菌根真菌在侵染供体植物以后其根外菌丝继续生长并侵染邻近的另外一株板栗植株(受体)。同位素示踪试验表明，供体板栗体内的^32P可通过菌丝桥传递给受体板栗，受体植株不仅根中^32P放射性强度高于对照，而且茎中^32P强度也显著高于对照。说明外生菌根真菌在不同板栗植株间形成了菌丝桥，但是菌丝桥传递的磷的数量很有限，仅占供体植株体内总磷量的5％-8％。美味牛肝菌和褐环乳牛肝菌侵染供体板栗植株以后，使植株含磷量、总吸磷量和生物量较对照明显增加。受体板栗幼苗在菌丝桥建立以后其植株含磷量和总吸磷量显著高于对照，但生物量与对照没有显著差别。

Transferring of phosphorus between chestnut seedlings via ectomycorrhizal hyphal links

Chestnut is an important cash special olcal product in Beijing which is exported to many foreign countries.The tree were grown along Yanshan mountain where the soil fertility is very poor because the farmer do not apply fertilizer.Therefore ectomycorrhizal fungi may play important role to the growth of the tree.In orde r to understand the improvement of phosphorus status in plant by inoculating wit h ectomycorrhizal fungi and the phosphorus transferring between chestnut seedlin gs via hyphal link,a four ...