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, firs...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.展开更多
为测定植烟土壤中16种多环芳烃(PAHs)的含量,建立并优化了土壤样品的洗脱净化方法,比较了不同洗脱剂、净化方法及净化条件的提取效果。结果表明,3种洗脱剂中正己烷-二氯甲烷混合液(体积比1∶1)洗脱效果最好,四通道色谱分离仪法在提取效...为测定植烟土壤中16种多环芳烃(PAHs)的含量,建立并优化了土壤样品的洗脱净化方法,比较了不同洗脱剂、净化方法及净化条件的提取效果。结果表明,3种洗脱剂中正己烷-二氯甲烷混合液(体积比1∶1)洗脱效果最好,四通道色谱分离仪法在提取效果、溶剂耗量、操作时间上均优于硅胶柱法。在最佳操作条件下(洗脱剂用量2 m L/次、洗脱时间50 s/次)洗脱5次后采用气相色谱—质谱联用仪对16种PAHs进行检测,16种PAHs均在20~2 000μg/L内呈线性关系(R>0.99),仪器检出限为0.72~2.09μg/L,植烟土壤中16种PAHs的加标回收率为80.3%~114.4%,相对标准偏差为4.2%~12.3%。该方法简便、高效,能准确测定出植烟土壤中16种PAHs的含量。展开更多
基金supported by a Ph.D. scholarship provided by University of Tasmania (185466S9A),Australiathe Open Fund of State Key Laboratory of Tea Plant Biology Utilization at Anhui Agricultural University (SKLTOF20170112)
文摘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.
文摘为测定植烟土壤中16种多环芳烃(PAHs)的含量,建立并优化了土壤样品的洗脱净化方法,比较了不同洗脱剂、净化方法及净化条件的提取效果。结果表明,3种洗脱剂中正己烷-二氯甲烷混合液(体积比1∶1)洗脱效果最好,四通道色谱分离仪法在提取效果、溶剂耗量、操作时间上均优于硅胶柱法。在最佳操作条件下(洗脱剂用量2 m L/次、洗脱时间50 s/次)洗脱5次后采用气相色谱—质谱联用仪对16种PAHs进行检测,16种PAHs均在20~2 000μg/L内呈线性关系(R>0.99),仪器检出限为0.72~2.09μg/L,植烟土壤中16种PAHs的加标回收率为80.3%~114.4%,相对标准偏差为4.2%~12.3%。该方法简便、高效,能准确测定出植烟土壤中16种PAHs的含量。
