摘要
Salinity is a global challenge to agricultural production. Understanding Na^+ sensing and transport in plants under salt stress will be of benefit for breeding robustly salt-tolerant crop species. In this review, first, possible salt stress sensor candidates and the root meristem zone as a tissue harboring salt stress-sensing components are proposed. Then,the importance of Na^+ exclusion and vacuolar Na^+ sequestration in plant overall salt tolerance is highlighted. Other Na^+ regulation processes, including xylem Na^+ loading and unloading, phloem Na^+ recirculation, and Na^+ secretion, are discussed and summarized.Along with a summary of Na^+ transporters and channels, the molecular regulation of Na^+ transporters and channels in response to salt stress is discussed. Finally, some largely neglected issues in plant salt stress tolerance, including Na^+ concentration in cytosol and the role of Na^+ as a nutrient, are reviewed and discussed.
Salinity is a global challenge to agricultural production. Understanding Na^＋ sensing and transport in plants under salt stress will be of benefit for breeding robustly salt-tolerant crop species. In this review, first, possible salt stress sensor candidates and the root meristem zone as a tissue harboring salt stress-sensing components are proposed. Then,the importance of Na^＋ exclusion and vacuolar Na^＋ sequestration in plant overall salt tolerance is highlighted. Other Na^＋ regulation processes, including xylem Na^＋ loading and unloading, phloem Na^＋ recirculation, and Na^＋ secretion, are discussed and summarized.Along with a summary of Na^＋ transporters and channels, the molecular regulation of Na^＋ transporters and channels in response to salt stress is discussed. Finally, some largely neglected issues in plant salt stress tolerance, including Na^＋ concentration in cytosol and the role of Na^＋ as a nutrient, are reviewed and discussed.
基金
supported by a Ph.D. scholarship provided by University of Tasmania (185466S9A),Australia
the Open Fund of State Key Laboratory of Tea Plant Biology Utilization at Anhui Agricultural University (SKLTOF20170112)
