磷有效性对大豆菌根侵染的调控及其与根构型、磷效率的关系

以30个不同根构型的大豆基因型为材料，通过盆栽试验，研究了生长介质磷有效性对大豆接种摩西球囊霉属丛枝菌根真菌的影响及其与根构型、磷效率的关系.结果表明：生长介质磷有效性显著地影响大豆菌根真菌的接种效果.低磷条件下接种菌根真菌效果明显，菌根侵染率较高，菌根对大豆磷吸收的贡献率较大；高磷条件下接种菌根真菌效果不显著，菌根侵染率较低，菌根对大豆磷吸收的贡献率较低.磷有效性和大豆根构型对菌根真菌接种的影响具有交互作用.低磷条件下，中间型和深根型大豆的菌根侵染率最高，浅根型最小.高磷条件下，根构型与菌根侵染率间的关系不明显.根构型和菌根侵染状况对大豆磷效率的贡献存在互利互补关系，磷效率高的大豆基因型一般具有较好的根构型或较高的菌根侵染率.

Regulation effect of soil P availability on mycorrhizal infection in relation to root architecture and P efficiency of Glycine max.

A pot experiment with thirty soybean (Glycine max) genotypes differing in root architecture was conducted to investigate the effects of soil phosphorus (P) availability on the colonization of arbuscular mycorrhizae (AM) fungus (Glomus mosseae) as well as the relationships of the colonization with the root architecture and P efficiency of soybean. The results indicated that soil P availability had significant effects on the colonization of G. mosseae. Under low P condition, the AM had a higher infection rate and contributed more to the P uptake by soybean; while under high P condition, it was in adverse. There was a significant interaction between soybean genotypes and soil P availability on the colonization of G. mosseae. Under low P condition, the soybean genotypes with intermediate and deep root architectures had the highest infection rate of AM, but on the contrary, no significant correlation was observed between root architecture and AM colonization under high-P condition. In general, P-efficient soybean genotypes had better root architecture or higher AM colonization, indicating that a complementary relationship between root architecture and AM colonization was existed on their contribution to soybean P efficiency.