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盐分胁迫对蒺藜苜蓿叶片蒸腾和水分利用效率的影响

发表时间:2015-04-15  浏览量:1776  下载量:497
全部作者: 李紫薇,梁国婷,国静
作者单位: 山东农业大学林学院;东北林业大学盐碱地生物资源环境研究中心,东北油田盐碱植被恢复与重建教育部重点实验室;潍坊科技学院贾思勰农学院
摘 要: 以盆栽蒺藜苜蓿(Medicago truncatula)幼苗为研究对象,采用人工模拟盐胁迫,测定分析其光合效率参数对土壤盐分浓度的响应特征。结果表明,蒺藜苜蓿叶片的蒸腾速率(transpiration rate,Tr)、水分利用效率(water use efficiency,WUE)及光能利用效率(light use efficiency,LUE)对土壤盐分和光合有效辐射(photosynthetically active radiation,PAR)强度的变化具有明显的阈值。盐分浓度在0~250 mmol·L-1范围内,LUE均维持在较高水平,适宜PAR在300~1 000 μmol·m-2·s-1之间。因此,可认为土壤盐分浓度在100~250 mmol·L-1范围内,Tr,WUE及LUE均维持在较高值,盐分浓度低于或高于这一范围对于提高WUE和LUE均不利,可认为这一范围是蒺藜苜蓿幼苗合理生长的盐分范围,此时较适宜的PAR应维持在400~1 000 μmol·m-2·s-1之间。
关 键 词: 植物学;蒸腾速率;水分利用效率;光能利用效率;盐分胁迫;蒺藜苜蓿
Title: Influence of salt stress on transpiration rate and water use efficiency in leaves of Medicago truncatula
Author: LI Ziwei, LIANG Guoting, GUO Jing
Organization: College of Forestry, Shandong Agricultural University; Key Laboratory of Saline-alkali Vegetation Ecology Restoration in Oil Field, Ministry of Education, Alkali Soil Natural Environmental Science Center, Northeast Forestry University; College of Agronomic Sciences, Weifang University of Science and Technology
Abstract: In order to ascertain the optimum soil moisture and light intensity for the growth of Medicago truncatula, LI-6400 photosynthesis system was used to measure the light response of photosynthetic physiology parameters, such as transpiration rate (Tr), water use efficiency (WUE) and light use efficiency (LUE), under a series of salt treatments in leaves of M. truncatula. The results show that the Tr, WUE and LUE of the leaves has notable threshold value to the variation of salt content and photosynthetically active radiation (PAR). With the salt content of 0-250 mmol·L-1, the LUE maintained higher value and the fitting PAR was in the range of 300-1 000 μmol·m-2·s-1. We conclud that all the Tr, WUE and LUE maintain higher value under 100-250 mmol·L-1 salt treatment, beyond which, the WUE and LUE will decline. M. truncatula may maintain normal growth under 100-250 mmol·L-1 salt, and the fitting PAR is 400-1 000 μmol·m-2·s-1.
Key words: botany; transpiration rate; water use efficiency; light use efficiency; salt stress; Medicago truncatula
发表期数: 2015年4月第7期
引用格式: 李紫薇,梁国婷,国静. 盐分胁迫对蒺藜苜蓿叶片蒸腾和水分利用效率的影响[J]. 中国科技论文在线精品论文,2015,8(7):649-654.
 
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