干旱区生态环境知识资源中心(Arid): 盐胁迫对砂蓝刺头不同器官中离子分布的影响

Arid

	盐胁迫对砂蓝刺头不同器官中离子分布的影响
其他题名	Effects of salt stress on ion distribution in different Echinops gmelini organs
	杨小菊; 赵昕; 石勇; 李新荣
来源期刊	草业学报
ISSN	1004-5759
出版年	2013
卷号	22 期号:4 页码:116-122
中文摘要	砂蓝刺头为广泛分布于北方沙漠的一年生草本植物。本研究以砂蓝刺头幼苗为试材,采用营养液培养法研究了不同浓度NaCl胁迫下(盐浓度分别为0,100,200,300,400mmol/L)砂蓝刺头幼苗胁迫6d后植株含水量变化,测定不同器官中Na~+、Cl~-、Si~(4+)、K~+、Ca~(2+)的含量,并分析了K~+/Na~+、Ca~(2+)/Na~+、Si~(4+)/Na~+值的变化。研究结果表明,盐胁迫下,砂蓝刺头幼苗含水量在盐处理浓度为100,200,300,400 mmol/L时分别比对照升高了9.86%,1.41%,4.23%,8.45%,说明盐胁迫下植株提高了组织含水量,这将在一定程度上稀释了体内盐离子,减弱盐胁迫造成的生理干旱。盐胁迫下砂蓝刺头根部的Na~+和Cl~-含量高于叶片,这有利于渗透调节,同时减弱了盐胁迫对地上部的毒害;根系Si~(4+)、K~+、Ca~(2+)的含量及K~+/Na~+、Ca~(2+)/Na~+、Si~(4+)/Na~+值比对照显著性下降,叶部Si~(4+)、K~+的含量和K~+/Na~+,Ca~(2+)/Na~+,Si~(4+)/Na~+值比对照有所增加或差异不显著,这有利于维持地上部分离子稳定。分析离子选择性吸收的S_(Na)~+,K~+数据发现,盐胁迫下砂蓝刺头根部拦截了部分Na~+减缓了对地上部分的伤害,叶片对K~+吸收具有很好的选择性,对于维持地上部分离子平衡和正常的光合作用具有重要意义。
英文摘要	Echinops gmelini is an annual wild plant distributed in arid desert areas of North China. The changes of water content, Na~+, Cl~-, Si~(4+), K~+, Ca~(2+) contents and the K~+/Na~+, Ca~(2+)/Na~+, Si~(4+)/Na~+ ratios were measured in E. gmelini seedlings in a water control and under different concentrations (100, 200, 300, 400 mmol/L) of NaCl stress: the water contents were found to increase by 9.86%, 1.41%, 4.23%, and 8.45%, respectively. Therefore the ability to absorb water was enhanced under salt stress, resulting in dilution of the cell’s salt ion concentration to reduce physiological drought caused by salt ions. Na~+ and Cl~- contents of roots were higher than those of leaves under salt stress, so the salt ion damage on the leaves was reduced; The Si~(4+), K~+, Ca~(2+) concentrations and K~+/Na~+, Ca~(2+)/Na~+, Si~(4+)/Na~+ ratio in roots under salt stress were significantly reduced compared with no salt stress. Based on the ion selective absorption of Na~+ and K~+, E. gmelini roots retained more Na~+ and reduced the Na~+ damage to leaves; The K~+ selective absorption to leaves of E. gmelini were strengthened under NaCl stress, which was significant for maintaining iron homeostasis and photosynthesis in shoots.
中文关键词	砂蓝刺头 ; 盐胁迫 ; 离子分布
英文关键词	Echinops gmelini salt stress ion distribution
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRONOMY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4914648
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229297
作者单位	中国科学院寒区旱区环境与工程研究所, 甘肃省寒区旱区逆境生理生态重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	杨小菊,赵昕,石勇,等. 盐胁迫对砂蓝刺头不同器官中离子分布的影响[J]. 中国科学院西北生态环境资源研究院,2013,22(4):116-122.
APA	杨小菊,赵昕,石勇,&李新荣.(2013).盐胁迫对砂蓝刺头不同器官中离子分布的影响.草业学报,22(4),116-122.
MLA	杨小菊,et al."盐胁迫对砂蓝刺头不同器官中离子分布的影响".草业学报 22.4(2013):116-122.