干旱区生态环境知识资源中心(Arid): Symbiotic dinitrogen fixation is seasonal and strongly regulated in water-limited environments

Arid

DOI	10.1111/nph.15526
	Symbiotic dinitrogen fixation is seasonal and strongly regulated in water-limited environments
	Dovrat, Guy 1,2; Sheffer, Efrat 1
通讯作者	Dovrat, Guy ; Sheffer, Efrat
来源期刊	NEW PHYTOLOGIST
ISSN	0028-646X
EISSN	1469-8137
出版年	2019
卷号	221 期号:4 页码:1866-1877
英文摘要	Plants, especially perennials, growing in drylands and seasonally dry ecosystems are uniquely adapted to dry conditions. Legume shrubs and trees, capable of symbiotic dinitrogen (N-2) fixation, often dominate in drylands. However, the strategies that allow symbiotic fixation in these ecosystems, and their influence on the nitrogen cycle, are largely unresolved. We evaluated the climatic, biogeochemical and ontogenetic factors influencing nitrogen fixation in an abundant Mediterranean legume shrub, Calicotome villosa. We measured nodulation, fixation rate, nitrogen allocation and soil biogeochemistry in three field sites over a full year. A controlled experiment evaluated differences in plant regulation of fixation as a function of soil nutrient availability and seedling and adult developmental stages. We found a strong seasonal pattern, shifting between high fixation rates during the rainy season at flowering and seed-set times to almost none in the rainless season. Under controlled conditions, plants downregulated fixation in response to soil nitrogen availability, but this response was stronger in seedlings than in adult shrubs. Finally, we did not find elevated soil nitrogen under N-2-fixing shrubs. We conclude that seasonal nitrogen fixation, regulation of fixation, and nitrogen conservation are key adaptations influencing the dominance of dryland legumes in the community, with broader consequences on the ecosystem nitrogen cycle.
英文关键词	biological nitrogen fixation Calicotome villosa drylands leaf nitrogen content leguminosae Mediterranean ecosystems symbiosis water limitation
类型	Article
语种	英语
国家	Israel
收录类别	SCI-E
WOS记录号	WOS:000458259600021
WOS关键词	NITROGEN-FIXATION ; CALICOTOME-VILLOSA ; LEGUMINOUS SHRUB ; N-2 FIXATION ; DROUGHT ; FOREST ; DIVERSITY ; DESERT ; TRANSFORMATIONS ; PRODUCTIVITY
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
来源机构	Hebrew University of Jerusalem
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217779
作者单位	1.Hebrew Univ Jerusalem, Robert H Smith Fac Agr Food & Environm, Inst Plant Sci & Genet Agr, IL-7610001 Rehovot, Israel; 2.Agr Res Org, Newe Yaar Res Ctr, Beef Cattle Sect, Dept Nat Resources, IL-30095 Ramat Yishay, Israel
推荐引用方式 GB/T 7714	Dovrat, Guy,Sheffer, Efrat. Symbiotic dinitrogen fixation is seasonal and strongly regulated in water-limited environments[J]. Hebrew University of Jerusalem,2019,221(4):1866-1877.
APA	Dovrat, Guy,&Sheffer, Efrat.(2019).Symbiotic dinitrogen fixation is seasonal and strongly regulated in water-limited environments.NEW PHYTOLOGIST,221(4),1866-1877.
MLA	Dovrat, Guy,et al."Symbiotic dinitrogen fixation is seasonal and strongly regulated in water-limited environments".NEW PHYTOLOGIST 221.4(2019):1866-1877.