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丛枝菌根真菌对双子叶植物生长和根系特征的影响:整合分析

郭晗铃,刘世俊,徐静,宋书锐,唐建军,陈欣*   

  1. (浙江大学生命科学学院, 杭州 310058)
  • 出版日期:2017-07-10 发布日期:2017-07-10

Effects of arbuscular mycorrhizal fungi on growth and root traits of dicotyledons plants: A metaanalysis.

GUO Han-ling, LIU Shi-jun, XU Jing, SONG Shu-rui, TANG Jian-jun, CHEN Xin*#br#   

  1. (College of Life Sciences, Zhejiang University, Hangzhou 310058, China).
  • Online:2017-07-10 Published:2017-07-10

摘要:

丛枝菌根真菌(arbuscular mycorrhizal fungi, AMF)帮助宿主植物吸收土壤养分和水分,促进植物的生长。研究表明,AMF可影响宿主植物根系的特征,但AMF对宿主植物的生长效应与根系特征的变化效应是否有关,目前仍不清楚。本文采用整合分析(Meta-analysis)的方法,探讨AMF对双子叶植物生长和根系特征的影响以及二者的相关性,并分析AMF的这一影响是否受土壤磷素水平(OlsenP)的调节。结果表明:AMF显著增加双子叶植物的总生物量、地上部分和地下部分生物量;AMF增加了双子叶植物根长、根面积和根体积,但降低了比根长;AMF对植物的这些影响受土壤磷水平调节,土壤低磷和中磷水平下AMF对植物的生长效应大于土壤高磷水平下的处理,而对根系特征的影响效应在中磷水平下高于低磷和高磷水平的处理。相关性分析结果表明,AMF对双子叶植物生长的影响与对根长、根体积的影响呈显著正相关,在低磷水平下根长对AMF的响应与植物生长的响应(MGR)具有更高的正相关性。本研究结果预示,AMF对宿主植物生长的效应可能通过改变根系特征实现碳的合理分配和从土壤中获得更多的水和养分等资源。
 

关键词: 液流速率, 环境因子, 热扩散探针, 时滞特征

Abstract:

Arbuscular mycorrhizal fungi (AMF) can help host plants acquire nutrients and water from soil and therefore can enhance plant growth. Although AMF can change root traits of host plants, whether the effects of AMF on growth correlate with the effects on root traits is not well known. Here we performed a meta-analysis to quantify the effects of AMF on growth and root traits of dicotyledonous plants, and the correlation between these two effects under different soil phosphorus (Olsen-P) levels. AMF significantly increased total biomass, shoot and root biomass, length and area of roots, but decreased the specific root length. These AMF effects were influenced by soil P levels. Effects of AMF on plant growth were higher under low and intermediate soil P than under high soil P level. For root traits, however, the AMF effects were higher under intermediate soil P than under low and high soil P level. Regression correlation analysis showed a high association between the effect of AMF on plant growth and the effect on length and volume of roots. The correlation between effect of AMF on root length and mycorrhizal growth response was higher under low soil P level than under low and intermediate soil P level. The results suggest that the AMF effects on plant growth could be through altering the root traits, further affecting carbon allocation and water and nutrient acquisition.
 

Key words: thermal diffusion probe, sap flow rate, environmental factor, time lag characteristics