丛枝菌根真菌对大豆不同水分条件的适应性研究

The study on adaptability of arbuscular mycorrhizal fungi to different water treatment

采用沙培基质试验 ,以大豆 (Glycinemax (L .)Merr.)为宿主植物研究了 4个AM菌株 (Glomusversi forme 1、Glomusmosseae 93、Glomusdiaphanum和Glomusversiforme 2 )在 3个基质相对含水率处理 (2 5 %、50 %、80 % )下的适应性。结果表明 :①Glomusmosseae 93、Glomusdiaphanum和Glomusversiforme 2在 50 %基质相对含水率时的侵染率高于 2 5 %处理 ,80 %时最低。而Glomusversiforme 1菌株侵染率则随着基质含水率的增加而增加 ;② 4个菌株菌丝量在 50 %时均高于 2 5 %水分处理 ,80 %时略有下降 ,但下降程度不同 ;③Glomusmosseae 93在 3个基质含水率处理下 ,侵染率和菌丝量均保持在较高水平 ,说明该菌株能适应较大幅度的基质含水率变化 ;④接种 4个AM菌株均可以降低大豆植株叶片的萎蔫系数和水势 ,改善植株的水分状况 ,提高植株的水分利用效率 ,从而增加植株地上部干重 ;⑤试验还说明 ,除供试 4个菌株之间的区别外 。

The adaptabilities of four AM fungi(G.ve rs iforme 1,G.mosseae 93,G.diaphanum,and G.versiforme 2)to three relative water content of substrate (25%,50%,80%) of soybean(Glycine max(L.)Merr.)in sand were studied. The results rev ealed as follows: (1) The root colonizations under treatments of 50% substrate r elative water content inoculated with G.mosseae 93,G.diaphanum and G.versiforme 2 were higher than 25%, while the tr eatment of 80% was the lowest. On the contrary, the root colonization of G.versiforme 1 increased when substrate water content rised; (2)The amount of external hyphae in treatments of 50% of all four isolates were more th an in 25%, but have a decrease of various degree in 80%; (3) G.mosseae maintained highest root colonization and amount of external hyphae under all three water content than other three isolates. It shows that this isolate co uld adapt larger range of substrate water content; (4) All four AMF could reduce soybean's wither coefficient and leaf water potential, improve soybean's water status, enhance soybean's water using efficiency, and then increse soybean's bio mass;(5)the adaptability to substrate water content was different for AMF iso lates that is from different areas in addition to their specific property.