Arbuscular mycorrhizal mediation of biomass-density relationship of Medicago sativa L. under two water conditions in a field experiment.

Mycorrhiza
Qian ZhangXin Chen

Abstract

The biomass-density relationship (whereby the biomass of individual plants decreases as plant density increases) has generally been explained by competition for resources. Arbuscular mycorrhizal fungi (AMF) are able to affect plant interactions by mediating resource utilization, but whether this AMF-mediated interaction will change the biomass-density relationship is unclear. We conducted an experiment to test the hypothesis that AMF will shift the biomass-density relationship by affecting intraspecific competition. Four population densities (10, 100, 1,000, or 10,000 seedlings per square meter) of Medicago sativa L. were planted in field plots. Water application (1,435 or 327.7 mm/year) simulated precipitation in wet areas (sufficient water) and arid areas (insufficient water). The fungicide benomyl was applied to suppress AMF in some plots ("low-AMF" treatment) and not in others ("high-AMF" treatment). The effect of the AMF treatment on the biomass-density relationship depended on water conditions. High AMF enhanced the decrease of individual biomass with increasing density (the biomass-density line had a steeper slope) when water was sufficient but not when water was insufficient. AMF treatment did not affect plant survival ...Continue Reading

References

Nov 13, 2002·Proceedings. Biological Sciences·Peter StollToshihiko Hara
Sep 1, 1984·Applied and Environmental Microbiology·A K Hossain, M Alexander
Mar 1, 1996·Applied and Environmental Microbiology·N RequenaJ M Barea
Apr 1, 2006·Biological Reviews of the Cambridge Philosophical Society·David I WartonMark Westoby

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Citations

Aug 28, 2021·Ecological Applications : a Publication of the Ecological Society of America·Hai-Xia DuanYou-Cai Xiong

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