SOLUBLE CARBOHYDRATES IN ROOTS OF LEEK (ALLIUM-PORRUM) PLANTS IN RELATION TO PHOSPHORUS SUPPLY AND VA MYCORRHIZAS

被引:9
作者
AMIJEE, F
STRIBLEY, DP
TINKER, PB
机构
[1] NERC, SWINDON SN2 1EU, WILTS, ENGLAND
[2] AFRC, INST ARABLE CROPS RES, ROTHAMSTED EXPTL STN, HARPENDEN AL5 2JQ, HERTS, ENGLAND
关键词
Allium porrum L; Glomus mosseae L; leek; phosphorus supply; soluble carbohydrates; VA mycorrhizas;
D O I
10.1007/BF00009259
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Leek plants (Allium porrum L.) inoculated with Glomus mosseae were raised on sterilized soil/sand medium amended with Ca(H2PO4)2.H2O to test the hypothesis that high concentration of soil P inhibits formation of vesicular-arbuscular (VA) mycorrhizas by reducing concentration of soluble carbohydrate in the root. When P supply was increased, from either P addition or VA mycorrhizal infection, there was initially also an increase in concentration of soluble carbohydrate in the root. At the concentration of soil P at which infection was reduced, concentration of soluble carbohydrate was at its maximum. Therefore the above hypothesis is discounted. An increased delay in infection establishment and a greater number of abortive entry points would suggest that high concentration of soil P reduces VA mycorrhizal infection by changing the anatomy of the root to make it resistant to fungal penetration. © 1990 Kluwer Academic Publishers.
引用
收藏
页码:195 / 198
页数:4
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