SUMMARYRoot colonization by vesicular-arbuscular (VA) mycorrhizal fungi is often suppressed by phosphorus (P) additions; however, nitrogen (N) additions have been reported to both stimulate and suppress root colonization. Tbe objective of tbis researcb was to examine colonization of Alliutn cepa L. roots at a range of P and N concentrations in order to clarify tbe effects of tbese nutrients on root colonization. In tbe first experiment, conducted under N-limiting conditions, P addition bad no effect on root colonization by Glomus etunicatum Becker & Gerdemann and increased root colonization by Gigaspora margarita Gerdemann and Trappe. In tbe second experiment, conducted under N-sufficient conditions, P addition suppressed colonization by G. etunicatum. In tbe tbird experiment, P and N additions were sucb tbat tissue P:N ratios ranged from 0-03 (P limiting) to 0-17 (N limiting). No relationsbip was found between P:N ratio and root colonization for two isolates of G. etunicatum. Root colonization was not affected by P addition wben plants were deficient in N but, wben N was sufficient, P addition suppressed root colonization. Tbese results demonstrate tbat plant N stress affects tbe resistance of tbe bost root to colonization by VA mycorrbizal fungi.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.