北京林业大学学报2016，Vol.38Issue(10)：38-49,12.DOI:10.13332/j.1000--1522.20150393
3种滨藜属植物幼苗叶片对NaCl胁迫的生理响应
Leaf physiological characteristics of seedlings of three Atriplex species under NaCl stress
摘要
Abstract
Atriplex species, such as Atriplex canescens ssp. aptera, A. canescens ssp. canescens var. laciniata and A. canescens, as unique quasi-evergreen shrubs in arid and semi-arid desert area, are of high socio-ecological importance in controlling desertification, improving soil quality in saline land, and supporting local ecological balance. Here we measured salt injury index, salt-tolerant thresholds and physiological characteristics of the first-year seedlings by a salt-stress experiment conducted in pots. In the experiment, the pots were filled with sand and the six salt levels were adjusted to 0 , 0. 1%, 0. 3%, 0. 5%, 0. 7%, and 1. 0% NaCl. The results showed that: 1 ) Na+ increased and K+ decreased in each part of three Atriplex seedlings under salt stress. Compared with A. canescens ssp. aptera and A. canescens, the relatively lower Na+ and higher K+ contents were retained in each part of A. canescens ssp. canescens var. laciniata, which was conducive to keeping higher K+/Na+ balance. 2 ) The initial NaCl concentration with salt stress, salt-tolerance threshold and salt concentration limit of A. canescens ssp. <br> canescens var. laciniata were higher than the other two plants. 3 ) The salt-tolerance thresholds of A. canescens ssp. aptera, A. canescens ssp. canescens var. laciniata and A. canescens were 0. 59%, 0. 68%, and 0. 63%, respectively. 4 ) With salt stress increasing, MDA content and cytomembrane permeability were consistently increasing. 5) The salt-tolerance thresholds of the three species based on subordinate function comprehensive evaluation were in the order of A. canescens ssp. canescens var. laciniata (0. 686) >A. canescens (0. 532) >A. canescens ssp. aptera (0. 102). It is suggested that A. canescens ssp. canescens var. laciniata has a stronger adaptability to saline soil than A. canescens and A. canescens ssp. aptera.关键词
耐盐性/NaCl胁迫/苗期/生理响应/滨藜属植物Key words
salt tolerance/NaCl stress/seedling stage/physiological response/Atriplex species分类
农业科技引用本文复制引用
党晓宏,高永,蒙仲举,包蕾,王珊,高君亮,余新春,王祯仪..3种滨藜属植物幼苗叶片对NaCl胁迫的生理响应[J].北京林业大学学报,2016,38(10):38-49,12.基金项目
“948”国家林业局引进项目(2015-4-22)、内蒙古自治区自然基金项目(2015MS0301)。 （2015-4-22）
