气候变化领域集成服务门户(CCPortal): Conditional sanctioning in a legume-Rhizobium mutualism

CCPortal

DOI	10.1073/pnas.2025760118
	Conditional sanctioning in a legume-Rhizobium mutualism
	Westhoek A.; Clark L.J.; Culbert M.; Dalchau N.; Griffiths M.; Jorrin B.; Karunakaran R.; Ledermann R.; Tkacz A.; Webb I.; James E.K.; Poole P.S.; Turnbull L.A.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:19
英文摘要	Legumes are high in protein and form a valuable part of human diets due to their interaction with symbiotic nitrogen-fixing bacteria known as rhizobia. Plants house rhizobia in specialized root nodules and provide the rhizobia with carbon in return for nitrogen. However, plants usually housemultiple rhizobial strains that vary in their fixation ability, so the plant faces an investment dilemma. Plants are known to sanction strains that do not fix nitrogen, but nonfixers are rare in field settings, while intermediate fixers are common. Here, we modeled how plants should respond to an intermediate fixer that was otherwise isogenic and tested model predictions using pea plants. Intermediate fixers were only tolerated when a better strain was not available. In agreement with model predictions, nodules containing the intermediate-fixing strain were large and healthy when the only alternative was a nonfixer, but nodules of the intermediate-fixing strain were small and white when the plant was coinoculated with a more effective strain. The reduction in nodule size was preceded by a lower carbon supply to the nodule even before differences in nodule size could be observed. Sanctioned nodules had reduced rates of nitrogen fixation, and in later developmental stages, sanctioned nodules contained fewer viable bacteria than nonsanctioned nodules. This indicates that legumes can make conditional decisions, most likely by comparing a local nodule-dependent cue of nitrogen output with a global cue, giving them remarkable control over their symbiotic partners. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Legume; Resource allocation; Rhizobia; Sanction; Symbiosis
语种	英语
scopus关键词	Article; bacterial strain; carbon fixation; carbon metabolism; controlled study; mathematical computing; mathematical model; nitrogen fixation; nitrogen metabolism; nonhuman; pea; plant bacterium interaction; plant growth; plant root; Rhizobium; shoot; strain identification
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238574
作者单位	Department of Plant Science, University of Oxford, Oxford, OX1 3RB, United Kingdom; Systems Biology Doctoral Training Centre, Doctoral Training Centre, University of Oxford, Oxford, OX1 3NP, United Kingdom; Biological Computation, Microsoft Research Cambridge, Cambridge, CB1 2FB, United Kingdom; Department of Molecular Microbiology, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, United Kingdom; Ecological Sciences, The James Hutton Institute, Invergowrie, DD2 5DA, United Kingdom
推荐引用方式 GB/T 7714	Westhoek A.,Clark L.J.,Culbert M.,et al. Conditional sanctioning in a legume-Rhizobium mutualism[J],2021,118(19).
APA	Westhoek A..,Clark L.J..,Culbert M..,Dalchau N..,Griffiths M..,...&Turnbull L.A..(2021).Conditional sanctioning in a legume-Rhizobium mutualism.Proceedings of the National Academy of Sciences of the United States of America,118(19).
MLA	Westhoek A.,et al."Conditional sanctioning in a legume-Rhizobium mutualism".Proceedings of the National Academy of Sciences of the United States of America 118.19(2021).