文献类型： 外文期刊

作者： You, Shuanghong ¹ ; Wang, Yuqing ² ; Li, Yanju ² ; Li, Yuhe ² ; Tan, Ping ¹ ; Wu, Zheng ¹ ; Shi, Wenjing ¹ ; Song, Zhizho ¹ ;

作者机构： 1.Chongqing Acad Agr Sci, Chongqing 401329, Peoples R China

2.Ludong Univ, Key Lab Mol Module Based Breeding High Yield & Ab, Univ Shandong, Yantai 264025, Peoples R China

3.Ludong Univ, Coll Agr, Yantai 264025, Peoples R China

4.Yantai Acad Agr Sci, Yantai 264000, Peoples R China

期刊名称：BIOMED RESEARCH INTERNATIONAL （ 影响因子：2.6； 五年影响因子：3.1 ）

ISSN： 2314-6133

年卷期： 2020 年 2020 卷

页码：

收录情况： SCI

摘要： Ammonium (NH4+) plays key roles in plant growth, development, fruit quality, and yield. In plants, NH4+ uptake and transport are facilitated by NH4+ transporters (AMT). However, molecular mechanisms and physiological functions of type-II AMT (AMT2) transporters in fruit trees are still unclear, especially in peach. In this study, we cloned and characterized an AMT2 family gene from peach, PpeAMT3;4, and determined its function in yeast mutant. Expression analysis showed that PpeAMT3;4 was majorly expressed in peach roots and significantly decreased by NH4+ excess but had no response to NH4+ deficiency. Functional determination and (15)nitrogen-labeled NH4+ uptake assay in yeast cells implied that PpeAMT3;4 was a typical high-affinity transporter, with a Km value of 86.3 mu M, that can uptake external NH4+ in yeast cells. This study provides gene resources to uncover the biological function of AMT2 transporters and reveals molecular basis for NH4+ uptake and nitrogen (N) nutrition mechanisms in fruit trees.