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Mechanistic understanding of interspecific interaction between a C4 grass and a C3 legume via arbuscular mycorrhizal fungi as influenced by soil phosphorus availability using a 13 C and 15 N dual-labelled organic patch

Mechanistic understanding of interspecific interaction between a C4 grass and a C3 legume via arbuscular mycorrhizal fungi as influenced by soil phosphorus availability using a 13 C and 15 N dual-labelled organic patch

Plant Journal: for Cell and Molecular Biology 2021

ISSN/ISBN: 0960-7412

PMID: 34293218

DOI: 10.1111/tpj.15434

Arbuscular mycorrhizal fungi (AMF) can improve plant nutrient acquisition either by directly supplying nutrients to plants or by promoting soil organic matter mineralisation, thereby affecting interspecific plant relationships in natural communities. We examined the mechanism by which P addition affects interspecific interactions between a C4 grass (Bothriochloa ischaemum, a dominant species in natural grasslands) and C3 legume (Lespedeza davurica, a subordinate species in natural grasslands) via AMF for plant growth by continuous 13 C and 15 N labelling combined with soil enzyme analyses. The results of 15 N labelling revealed that P addition differently affected shoot N uptake via AMF by B. ischaemum and L. davurica. Specifically, P addition significantly increased shoot N uptake via AMF by B. ischaemum, but significantly decreased that by L. davurica. Interspecific plant interactions via AMF significantly facilitated plant N uptake via AMF by B. ischaemum but significantly inhibited that by L. davurica under soil P-limited conditions, while the opposite effect was observed in case of excess P addition. This was consistent with the impact of interspecific plant interaction via AMF on arbuscular mycorrhizal (AM) benefit for plant growth. Our data indicated that the capability of plant N uptake via AMF is an important mechanism which influences interspecific relationships between C4 grasses and C3 legumes. Moreover, the effect of AMF on the activities of soil enzymes responsible for N and P mineralization substantially contributed to the consequence of interspecific plant interaction via AMF for plant growth.

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