期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 157, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2021.108243
关键词
Arbuscular mycorrhizal fungi; Drought stress; Isotopic labeling; Medicago truncatula; Phosphorus uptake; Radiophosphorus; Rhizophagus irregularis 'PH5'; Soil moisture gradient
类别
资金
- Czech Science Foundation [17-12166S, 20-08475S]
- Czech Academy of Sciences [RVO 67985939, RVO 61388971]
- Ministry of Consumer Protection, Food and Agriculture of the Federal Republic of Germany
- Ministry for Science, Research and Culture of the State of Brandenburg
The research demonstrates that arbuscular mycorrhizal fungi (AMF) play a significant role in enhancing phosphorus uptake by most plant species, even under limited water resources. The increased phosphorus uptake in plants grown under medium and low substrate moistures is likely due to the complementary effects of direct hyphal uptake and indirect alterations of substrate hydraulic properties by AMF.
Arbuscular mycorrhizal fungi (AMF) greatly facilitate uptake of phosphorus (P) by most plant species. Whether or how this changes if water becomes limiting remained little explored. Medicago truncatula plants were grown in previously sterilized cultivation substrate and inoculated or not with AMF isolate Rhizophagus irregularis 'PH5' (M or NM, respectively) in two-compartment rhizoboxes. The compartments were separated or not with root-excluding meshes. A 15-step soil moisture gradient (maintained over 5 weeks) spanned generous water supply through strong water deficiency. Two radioisotopes (P-33 and P-32) were injected into the plant and distant compartments, respectively, to distinguish cumulative and immediate-term plant P uptake from either of the compartments at each moisture level. M plants were larger than NM plants at high and medium moisture levels and accumulated markedly more P throughout the whole gradient. The immediate-term P uptake did not differ between M and NM plants at high moisture, but at medium and low moistures, M plants acquired significantly more P-33 than NM plants, even after accounting for differences in root biomass. Increased immediate-term P uptake by M plants grown under medium and low substrate moistures was probably due to complementary effect of direct hyphal uptake and indirect alterations of substrate hydraulic properties by AMF. This research illustrates that AMF remain functional part of plants even under severe drought stress and thus they should be considered when plant functioning under water deficiency is to be fully understood.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据