作者机构：
[Zheng Xiaodong; Zhang Zhenhua; Rong Xiangmin; Luo Zunchang; Liu Qiang; Song Haixing; Peng Jianwei; Xie Guixian; Zhang Yuping; Gu Jidong] College of Resources and Environment,Hunan Agricultural University;[Zheng Xiaodong; Zhang Zhenhua; Rong Xiangmin; Luo Zunchang; Liu Qiang; Song Haixing; Peng Jianwei; Xie Guixian; Zhang Yuping; Gu Jidong] Soil and Fertilizer Institute of Hunan Province;[Zheng Xiaodong; Zhang Zhenhua; Rong Xiangmin; Luo Zunchang; Liu Qiang; Song Haixing; Peng Jianwei; Xie Guixian; Zhang Yuping; Gu Jidong] Hunan Provincial Key Lab. Plant Nutrition Common University;[Zheng Xiaodong; Zhang Zhenhua; Rong Xiangmin; Luo Zunchang; Liu Qiang; Song Haixing; Peng Jianwei; Xie Guixian; Zhang Yuping; Gu Jidong] Hunan Provincial Key Lab. Farmland Pollution Control Agri. Resources Use;[Zheng Xiaodong; Zhang Zhenhua; Rong Xiangmin; Luo Zunchang; Liu Qiang; Song Haixing; Peng Jianwei; Xie Guixian; Zhang Yuping; Gu Jidong] School of Biological Sciences,The University of Hong Kong
会议名称：
Environmental Pollution and Public Health(EPPH 2012)
会议时间：
2012-05-17
会议地点：
中国上海
摘要：
In order to study the research development of different remediation methods and the future works of heavy metal pollution, we will give a brief summary of current situation of soil heavy metal polluti
期刊：
Australian Journal of Crop Science,2012年6(9):1377-1382 ISSN：1835-2693
通讯作者：
Song, H.-X.
作者机构：
College of Agricultural Resources and Environment, Hunan Agricultural University, Changsha, China;Hunan Provincial Key Laboratory of Plant Nutrition in Common University, Changsha, 410128, China;Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Changsha, 410128, China;National Engineering Laboratory of High Utilization Efficiency of Soil Fertilizer Resource, Changsha, 410128, China;National Center of Oilseed Crops Improvement Hunan Branch, Changsha, 410128, China
通讯机构：
College of Agricultural Resources and Environment, Hunan Agricultural University, China
关键词：
Nitrate nitrogen;Nitrogen use efficiency;Proton pump of tonoplast
摘要：
Large amount of N03 --N are accumulated in vacuole, and cannot be timeously reducted, reutilized and transported into cytoplasm. It is the main reason for great N03--N accumulation in vacuole and nitrogen (N) use efficiency cannot be further improved. Transport mechanism of N03--N across tonoplast is explained in this paper, there are two proton pumps (H+-ATPase and H+-PPase) on tonoplast with absolutely different biology functions and physical characteristic. Mg·ATP and Mg·PPi are the specific substrates of H+-ATPase and H+-PPase respectively, hydrolysis H+ is pumped into vacuole, and contribution to build electrochemical proton gradient between cytoplasm and vacuole. N03--N transport from vacuole to cytoplasm greatly depends on electrochemical proton gradient, N03--N transport from cytoplasm to vacuole is mainly achieved by vacuole H+/N03-antiport system, while symport system (vacuole N03--N combined with anion) is of benefit for vacuole N03--N transporting into cytoplasm. N03--N transported by proton pump of tonoplast is influenced by NR activity in cytoplasm, N03--N can be continuing assimilation and reduction by NR in cytoplasm, and accelerating vacuole N03--N transported into cytoplasm. These results will supply references and research forecast for further study on efficiency and practicable methods of N utilization, and improving reuse efficiency of N03--N in plant tissues.
