摘要
以高、中、低效３ 个磷效率基因型小麦为试材，在ｗ（Ｐ２Ｏ５） ＝２０ ｍｇｋｇ 和６０ ｍｇｋｇ 的水平下，接种或不接种两个ＶＡ菌根真菌Ｇｌｏｍｕｓ ｍｏｓｓｅａｅ 和Ｇｌｏｍｕｓｖｅｒｓｉｆｏｒｍｅ，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。
To study the factors affecting VA mycorrhizal dependency (MD) and mechanism involved, three wheat genotypes with high (H), middle (M) and low (L) phosphorus efficiencies were inoculated with or without Glomus mosseae or Glomus versiforme at two phosphorus application level of w (P 2O 5) 20 mg/kg and 60 mg/kg. At low P level, MD of wheat genotypes showed as M>L>H and MD on G. versiforme was greater than that on G. mosseae, while at high P level, inoculation with VAM fungi reduced the growth of host. Relationship analysis revealed that there was a significant negative relationship of MD with P efficiency, root uptake efficiency, and a significant positive relationship of MD with sugar tranlocation rate in phloem, but no significant relationship of MD with R/S ratio, P utilization efficiency, root length, root hair length and root hair density. It is suggested that the principal factor affecting MD of wheat with different P efficiencies is root uptake efficiency, and MD, P efficiency and sugar tranlocation rate in phloem are affected togeather by root uptake efficiency.
出处
《应用与环境生物学报》
CAS
CSCD
1999年第5期450-454,共5页
Chinese Journal of Applied and Environmental Biology
基金
国家"863"项目
国家自然科学基金
关键词
小麦
磷效率基因型
VA菌根真菌
菌根依赖性
wheat
phosphorus efficiency genotypes
VAM fungi
mycorrhizal dependency
affecting factors
