期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 278, 期 1718, 页码 2698-2703出版社
ROYAL SOC
DOI: 10.1098/rspb.2010.2193
关键词
pea; alfalfa; sanction; mutualism; bacteroid differentiation; rhizobia
资金
- National Science Foundation [0918986]
- [P30 CA7759]
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [0918986] Funding Source: National Science Foundation
The legume-rhizobia symbiosis is a classical mutualism where fixed carbon and nitrogen are exchanged between the species. Nonetheless, the plant carbon that fuels nitrogen (N(2)) fixation could be diverted to rhizobial reproduction by 'cheaters'-rhizobial strains that fix less N(2) but potentially gain the benefit of fixation by other rhizobia. Host sanctions can decrease the relative fitness of less-beneficial reproductive bacteroids and prevent cheaters from breaking down the mutualism. However, in certain legume species, only undifferentiated rhizobia reproduce, while only terminally differentiated rhizobial bacteroids fix nitrogen. Sanctions were, therefore, tested in two legume species that host non-reproductive bacteroids. We demonstrate that even legume species that host non-reproductive bacteroids, specifically pea and alfalfa, can severely sanction undifferentiated rhizobia when bacteroids within the same nodule fail to fix N(2). Hence, host sanctions by a diverse set of legumes play a role in maintaining N(2) fixation.
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