选取南通某滩涂疏浚淤泥,实验研究初始含水率、含盐量、初始pH和有机质含量等4个关键物化因子对滩涂淤泥的水泥固化早期无侧限抗压强度(UCS)的影响,并对影响机理进行了分析。结果表明,淤泥初始含水率越高,固化土的UCS相应越低;Cl-和SO_4...选取南通某滩涂疏浚淤泥,实验研究初始含水率、含盐量、初始pH和有机质含量等4个关键物化因子对滩涂淤泥的水泥固化早期无侧限抗压强度(UCS)的影响,并对影响机理进行了分析。结果表明,淤泥初始含水率越高,固化土的UCS相应越低;Cl-和SO_4^(2-)含量对早期UCS的影响存在临界值,分别为13.55 g·kg^(-1)和8.71 g·kg^(-1),在对应临界值内,3d和7 d UCS均随着离子含量的增加而升高,具有早强效果,超过临界值后,UCS均随着离子含量的增加而降低;淤泥初始pH的升高有利于早期固化强度的增长;有机质含量对早期UCS的影响并不显著。五因素四水平正交实验分析表明,各因素对早期强度的影响大小为:初始含水率>Cl-含量>初始pH>SO_4^(2-)含量>有机质含量,初始含水率的影响最为显著。该研究结果对淤泥的进一步快速固化研究具有重要的意义。展开更多
Salt stress is a maior environmental factor limiting plant growth and productivity. A better understanding of the mechanisms mediating salt resistance will help researchers design ways to improve crop performance unde...Salt stress is a maior environmental factor limiting plant growth and productivity. A better understanding of the mechanisms mediating salt resistance will help researchers design ways to improve crop performance under adverse environmental conditions. Salt stress can lead to ionic stress, osmotic stress and secondary stresses, particularly oxidative stress, in plants. Therefore, to adapt to salt stress, plants rely on signals and pathways that re-establish cellular ionic, osmotic, and reactive oxygen species （ROS） homeostasis. Over the past two decades, genetic and biochemical analyses have revealed several core stress signaling pathways that participate in salt resistance. The Salt Overly Sensitive signaling pathway plays a key role in maintaining ionic homeostasis, via extruding sodium ions into the apoplast. Mitogenactivated protein kinase cascades mediate ionic, osmotic, and ROS homeostasis. SnRK2 （sucrose nonfermenting l-related protein kinase 2） proteins are involved in maintaining osmotic homeostasis. In this review, we discuss recent progress in identifying the components and pathways involved in the plant＇s response to salt stress and their regulatory mechanisms. We also review progress in identifying sensors involved in salt-induced stress signaling in plants.展开更多
文摘选取南通某滩涂疏浚淤泥,实验研究初始含水率、含盐量、初始pH和有机质含量等4个关键物化因子对滩涂淤泥的水泥固化早期无侧限抗压强度(UCS)的影响,并对影响机理进行了分析。结果表明,淤泥初始含水率越高,固化土的UCS相应越低;Cl-和SO_4^(2-)含量对早期UCS的影响存在临界值,分别为13.55 g·kg^(-1)和8.71 g·kg^(-1),在对应临界值内,3d和7 d UCS均随着离子含量的增加而升高,具有早强效果,超过临界值后,UCS均随着离子含量的增加而降低;淤泥初始pH的升高有利于早期固化强度的增长;有机质含量对早期UCS的影响并不显著。五因素四水平正交实验分析表明,各因素对早期强度的影响大小为:初始含水率>Cl-含量>初始pH>SO_4^(2-)含量>有机质含量,初始含水率的影响最为显著。该研究结果对淤泥的进一步快速固化研究具有重要的意义。
基金supported by the National Genetically Modified Organisms Breeding Major Projects(2016ZX08009002)National Natural Science Foundation of China(31430012,31670260,U1706201)National Basic Research Program of China(2015CB910202)
文摘Salt stress is a maior environmental factor limiting plant growth and productivity. A better understanding of the mechanisms mediating salt resistance will help researchers design ways to improve crop performance under adverse environmental conditions. Salt stress can lead to ionic stress, osmotic stress and secondary stresses, particularly oxidative stress, in plants. Therefore, to adapt to salt stress, plants rely on signals and pathways that re-establish cellular ionic, osmotic, and reactive oxygen species （ROS） homeostasis. Over the past two decades, genetic and biochemical analyses have revealed several core stress signaling pathways that participate in salt resistance. The Salt Overly Sensitive signaling pathway plays a key role in maintaining ionic homeostasis, via extruding sodium ions into the apoplast. Mitogenactivated protein kinase cascades mediate ionic, osmotic, and ROS homeostasis. SnRK2 （sucrose nonfermenting l-related protein kinase 2） proteins are involved in maintaining osmotic homeostasis. In this review, we discuss recent progress in identifying the components and pathways involved in the plant＇s response to salt stress and their regulatory mechanisms. We also review progress in identifying sensors involved in salt-induced stress signaling in plants.
