文献类型：期刊文献

中文题名：盐胁迫下弗吉尼亚栎生长和生理生化变化

英文题名：Growth and physiological changes of Quercus virginiana under salt stress

作者：王树凤[1] 陈益泰[1] 孙海菁[1] 胡韵雪[1]

第一作者：王树凤

机构：[1]中国林业科学研究院亚热带林业研究所

年份：2008

卷号：17

期号：2

起止页码：747-750

中文期刊名：生态环境

外文期刊名：Ecology and Environment

收录：北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：浙江省科学技术厅重点项目(2007C22075)

语种：中文

中文关键词：弗古尼亚栎;盐胁迫;脯氨酸;Na^+;K^+吸收

外文关键词：Quercus virginiana; salt stress; proline; Na＋, K＋ absorption

分类号：Q948.113

摘要：弗吉尼亚栎(Quercus virginiana)是美国沿海地区重要的绿化树种,具有较强的耐盐性。文章采用Hoagland溶液水培方法,研究了美国引进树种-弗吉尼亚栎(简称弗栎)在3.0g·L-1、5.0g·L-1和7.0g·L-1NaCl胁迫下的生长状况以及叶片脯氨酸含量和对Na+、K+选择性吸收的动态变化。结果发现,在经过不同质量质量浓度NaCl处理21d后,随着NaCl质量质量浓度的增加,弗栎植株生长受到抑制,其中茎叶生物量减少的幅度较根系大,表明弗栎地上部生长比地下部对盐胁迫更加敏感,从而导致根冠比增加。同时发现,盐胁迫处理不同时期对叶片脯氨酸含量和Na+、K+含量的影响各不相同,在处理7d和21d时,叶片对Na+和K+的吸收量均有增加,使K+/Na+维持相对稳定的比值,而脯氨酸含量随NaCl质量质量浓度的增加减少;在处理第14d时,对Na+吸收增加的同时,抑制了对K+的吸收,导致K+/Na+比值随NaCl质量质量浓度的增加而迅速下降,而此时叶片脯氨酸含量随着盐质量质量浓度的增加而迅速增加,表明在盐胁迫早期和晚期,弗栎可能通过增加对K+的吸收以减轻Na+离子毒害效应,而在盐胁迫中期,叶片积累脯氨酸是适应盐胁迫的方式之一。
Live oak （ Quercus virginiana ） is one of the most important tree species along the coast of America because of its outstanding capability of salt tolerance. In this article we studied the growth of Quercus virginiana under 0, 3.0, 5.0 and 7.0 g·L^-1 NaCl stress in hydroponic culture using Hoagland solution and the dynamic changes of Na＋, K＋ and proline concentration in leaves for 7, 14 and 21 days after treatment. The result showed that the biomass of root, stem and leaves of Quercus virginiana were reduced with the increase of salinity and the decline of dry weight of stem and leaves was greater than that of root, which indicated that the aboveground of live oak was more sensitive to salt than the underground which lead to the increase of root-shoot ratio. We also found that the content of Na＋, K＋ and proline in leaves varied with different treated days. Under all treatments, the absorption ofNa＋ increased and the content ofproline in leaves decreased with the prolonging of treated days. The absorption ofK＋ measured on the 7th day and the 21st day increased and was restrained on the 14th day, which lead to the decline of K＋/Na＋ ratio. While the content of proline measured on the 14th day remarkably increased with the increase of salinity. Our experiment indicated the live oak seems to adapt the salt stress by increasing the absorption of K＋ during the earliest and late stages of salt stress and accumulating proline in leaves during the middle stage of salt stress.