气候变化领域集成服务门户(CCPortal): Diazotrophic abundance and community structure associated with three meadow plants on the Qinghai-Tibet Plateau

CCPortal

DOI	10.3389/fmicb.2023.1292860
	Diazotrophic abundance and community structure associated with three meadow plants on the Qinghai-Tibet Plateau
	Nshimiyimana, Jean Bosco; Zhao, Kang; Wang, Wenying; Kong, Weidong
发表日期	2024
EISSN	1664-302X
卷号	14
英文摘要	Symbiotic diazotrophs form associations with legumes and substantially fix nitrogen into soils. However, grasslands on the Qinghai-Tibet Plateau are dominated by non-legume plants, such as Kobresia tibetica. Herein, we investigated the diazotrophic abundance, composition, and community structure in the soils and roots of three plants, non-legume K. tibetica and Kobresia humilis and the legume Oxytropis ochrocephala, using molecular methods targeting nifH gene. Diazotrophs were abundantly observed in both bulk and rhizosphere soils, as well as in roots of all three plants, but their abundance varied with plant type and soil. In both bulk and rhizosphere soils, K. tibetica showed the highest diazotroph abundance, whereas K. humilis had the lowest. In roots, O. ochrocephala and K. humilis showed the highest and the lowest diazotroph abundance, respectively. The bulk and rhizosphere soils exhibited similar diazotrophic community structure in both O. ochrocephala and K. tibetica, but were substantially distinct from the roots in both plants. Interestingly, the root diazotrophic community structures in legume O. ochrocephala and non-legume K. tibetica were similar. Diazotrophs in bulk and rhizosphere soils were more diverse than those in the roots of three plants. Rhizosphere soils of K. humilis were dominated by Actinobacteria, while rhizosphere soils and roots of K. tibetica were dominated by Verrumicrobia and Proteobacteria. The O. ochrocephala root diazotrophs were dominated by Alphaproteobacteria. These findings indicate that free-living diazotrophs abundantly and diversely occur in grassland soils dominated by non-legume plants, suggesting that these diazotrophs may play important roles in fixing nitrogen into soils on the plateau.
关键词	biological nitrogen fixation grassland ecosystems non-leguminous plants nifH gene diazotrophs Qinghai-Tibet Plateau
英文关键词	BIOLOGICAL NITROGEN-FIXATION; FIXING BACTERIA; MICROBIAL COMMUNITY; NATURAL GRASSLANDS; SPATIAL-PATTERNS; CLIMATE-CHANGE; N-2 FIXATION; DIVERSITY; SOIL; RHIZOSPHERE
WOS研究方向	Microbiology
WOS记录号	WOS:001152929900001
来源期刊	FRONTIERS IN MICROBIOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282836
作者单位	Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Qinghai Normal University
推荐引用方式 GB/T 7714	Nshimiyimana, Jean Bosco,Zhao, Kang,Wang, Wenying,et al. Diazotrophic abundance and community structure associated with three meadow plants on the Qinghai-Tibet Plateau[J]. 中国科学院青藏高原研究所,2024,14.
APA	Nshimiyimana, Jean Bosco,Zhao, Kang,Wang, Wenying,&Kong, Weidong.(2024).Diazotrophic abundance and community structure associated with three meadow plants on the Qinghai-Tibet Plateau.FRONTIERS IN MICROBIOLOGY,14.
MLA	Nshimiyimana, Jean Bosco,et al."Diazotrophic abundance and community structure associated with three meadow plants on the Qinghai-Tibet Plateau".FRONTIERS IN MICROBIOLOGY 14(2024).