Light intensity affects the uptake and metabolism of glycine by pakchoi (Brassica chinensis L.)

文献类型： 外文期刊

第一作者： Ma, Qingxu

作者： Ma, Qingxu;Wu, Lianghuan;Mi, Wenhai;Feng, Ying;Ma, Qingxu;Wu, Lianghuan;Mi, Wenhai;Cao, Xiaochuang

作者机构：

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2016 年 6 卷

页码：

收录情况： SCI

摘要： The uptake of glycine by pakchoi (Brassica chinensis L.), when supplied as single N-source or in a mixture of glycine and inorganic N, was studied at different light intensities under sterile conditions. At the optimal intensity (414 mu mol m(-2) s(-1)) for plant growth, glycine, nitrate, and ammonium contributed 29.4%, 39.5%, and 31.1% shoot N, respectively, and light intensity altered the preferential absorption of N sources. The lower N-15-nitrate in root but higher in shoot and the higher N-15-glycine in root but lower in shoot suggested that most N-15-nitrate uptake by root transported to shoot rapidly, with the shoot being important for nitrate assimilation, and the N contribution of glycine was limited by post-uptake metabolism. The amount of glycine that was taken up by the plant was likely limited by root uptake at low light intensities and by the metabolism of ammonium produced by glycine at high light intensities. These results indicate that pakchoi has the ability to uptake a large quantity of glycine, but that uptake is strongly regulated by light intensity, with metabolism in the root inhibiting its N contribution.

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