凤眼莲与其根际细菌相互作用的研究

凤眼莲及其根际细菌的相互关系明显地受营养条件的影响，生长在含糖培养基中的凤眼莲根分泌物不改变其根际细菌的生长动态，但在含酚和无机营养条件下生长的凤眼莲根分泌物分别使其根际细菌出现２次和３次增长；而且在含酚环境中，根际细菌对凤眼莲表现出更为强烈的根际效应．细菌的代谢产物能提高凤眼莲体内的多酚氧化酶的活性，却抑制过氧化物酶的活性和减少其体内酚的富集量；然而接菌后的凤眼莲，其体内多酚氧化酶和过氧化物酶同时得到激活，且酚富集量增加．

Interaction between Eichhornia crassipes and its rhizospheric bacteria

The relationship between Eichhornia crassipes and its rhizospheric bacteria is markedly influenced by nutritional condition. The root exudates of the plant growing on sucrose containing medium have little effect on the dynamics of bacteria growth, but on phenol containing and inorganic media, the root exudates can respectively promote two- and three- fold growth of bacteria. Under phenolic condition, there exists a stronger rhizospheric effect: the metabolites of rhizospheric bacteria can promote the polyphenoloxidase activity of Eichhornia crassipes, but inhibit its peroxidase activity and decrease its phenol content. Eichhornia crassipes inoculated with bacteria has a higher activity of polyphenoloxidase and peroxidase and a higher content of phenol.