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题名: Arbuscular mycorrhiza maintains nodule function during external NH (4) (+) supply in Phaseolus vulgaris (L.)
作者: Mortimer, Peter E.3, 4; Perez-Fernandez, Maria A.2; Valentine, Alex J.1
刊名: MYCORRHIZA
关键词: Arbuscular mycorrhiza ; NH4+ ; Nitrogen fixation ; Photosynthesis ; Asparagines
英文摘要: The synergistic benefits of the dual inoculation of legumes with nodule bacteria and arbuscular mycorrhizae (AM) are well established, but the effect of an external NH (4) (+) supply on this tripartite relationship is less clear. This effect of NH (4) (+) supply was investigated with regards to the growth and function of the legume host and both symbionts. Nodulated Phaseolus vulgaris seedlings with and without AM, were grown in a sand medium with either 0 N, 1 mM or 3 mM NH (4) (+) . Plants were harvested at 30 days after emergence and measurements were taken for biomass, N-2 fixation, photosynthesis, asparagine concentration, construction costs and N nutrition. The addition of NH (4) (+) led to a decline in the percentage AM colonization and nodule dry weights, although AM colonization was affected to a lesser extent. NH (4) (+) supply also resulted in a decrease in the reliance on biological nitrogen fixation (BNF); however, the AM roots maintained higher levels of NH (4) (+) uptake than their non-AM counterparts. Furthermore, the non-AM plants had a higher production of asparagine than the AM plants. The inhibitory effects of NH (4) (+) on nodule function can be reduced by the presence of AM at moderate levels of NH (4) (+) (1 mM), via improving nodule growth or relieving the asparagine-induced inhibition of BNF.
出版日期: 2012-04-01
卷号: 22, 期号:3, 页码:237-245
DOI标识: 10.1007/s00572-011-0396-9
语种: 英语
ISSN号: 0940-6360
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/10501
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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作者单位: 1.Univ Stellenbosch, Dept Bot & Zool, Fac Sci, ZA-7602 Western Cape, South Africa
2.Univ Pablo de Olavide, Area Ecol, Fac Ciencias Expt, Seville 41013, Spain
3.Chinese Acad Sci, Key Lab Econ Plants & Biotechnol, Kunming Inst Bot, Kunming 650204, Peoples R China
4.Kunming Inst Bot, CMES, Kunming 650204, Yunnan, Peoples R China

Recommended Citation:
Mortimer, PE; Perez-Fernandez, MA; Valentine, A.Arbuscular mycorrhiza maintains nodule function during external NH (4) (+) supply in Phaseolus vulgaris (L.),MYCORRHIZA,2012,22(3):237-245
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