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FACTORS AND MECHANISM AFFECTING THE DEPENDENCY OF WHEAT GENOTYPES WITH DIFFERENT PHOSPHORUS EFFICIENCIES ON VA MYCORRHIZAE
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF APPLIED & ENVIRONMENTAL BIOLOGY
- Issue:
- 5
- DOI:
- 10.3321/j.issn:1006-687X.1999.05.003
- Key Word:
- 小麦;磷效率基因型;VA菌根真菌;菌根依赖性;影响因子
Abstract： 以高、中、低效3个磷效率基因型小麦为试材,在w(P2O5)=20 mg/kg和60 mg/kg的水平下,接种或不接种两个VA菌根真菌Glomus mosseae和Glomus versiforme,研究了影响小麦菌根依赖性的因子及机理.结果表明,在低磷水平下,小麦菌根依赖性的大小顺序为中效＞低效＞高效;对G. versiform的依赖性大于对G. mosseae的依赖性;而在高磷水平下,接种菌根表现出不同程度的生长抑制作用.相关分析发现,菌根依赖性与根/冠比、根长、根毛长度、根毛密度、磷利用效率之间的相关性不显著;在低磷水平下,菌根依赖性与磷效率、根吸收效率之间呈极显著的负相关,与韧皮部蔗糖运输速率之间呈显著或极显著的正相关.认为影响不同磷效率基因型小麦菌根依赖性的主要因子是根的吸收效率;菌根依赖性、磷效率和韧皮部蔗糖运输速率均受根吸收效率影响.
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