Effect of pH on the uptake and metabolism of glycine in pak choi (Brassica chinensis L.)

文献类型： 外文期刊

第一作者： Ma, Qingxu

作者： Ma, Qingxu;Xie, Yinan;Gu, Yan;Feng, Ying;Mi, Wenhai;Yang, Xin;Wu, Lianghuan;Ma, Qingxu;Xie, Yinan;Gu, Yan;Feng, Ying;Mi, Wenhai;Yang, Xin;Wu, Lianghuan;Cao, Xiaochuang

作者机构：

关键词： pH;Glycine;Uptake;Metabolism;Nitrate;Ammonium;Pak choi

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：5.545； 五年影响因子：5.99 ）

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收录情况： SCI

摘要： Although plants can utilize amino acids as a nitrogen (N) source, it is unclear how pH affects the uptake of amino acids. We investigated the relative uptake of glycine, nitrate, and ammonium by pak choi at different pH levels using specific substrate N-15-labelling in a sterile environment. Further, the mechanisms underlying the influence of pH on glycine uptake and metabolism were examined by N-15 labelling short-term uptake and N-15-gas chromatography-mass spectrometry analysis. The optimal pH for glycine uptake was 7.0, for both single and mixed nitrogen sources, whereas that for pak choi growth (mixed N sources) was 6.2. Glycine served as an important N source in the sterile environment, accounting for 19.0%-33.1% of N in the mixed N sources, and contribution peaked at pH 7.0. Little N-15 labelled glycine was detected in shoots, indicating that the majority of the glycine absorbed by the roots was metabolized to other amino acids. The limiting step for N contribution by glycine was root uptake at lower pH levels, particularly active uptake, and root metabolism of glycine to serine at pH 8.0. These results indicate that pak choi can efficiently utilize glycine, and that pH has a substantial effect on glycine uptake and metabolism. (C) 2016 Elsevier B.V. All rights reserved.

分类号： Q94

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