水淹对秋华柳根茎细胞壁组分镉含量的影响  

Effect of flooding on cadmium content in different cell wall components of the root and stem of Salix variegata Franch

作　　者：周翠 陈锦平 王婷[1] 陈红纯 李瑞 马文超 魏虹 ZHOU Cui;CHEN Jin-ping;WANG TingJ;CHEN Hong-chun;LI Ruil;MA Wen-chao;WEI Hong(Key Laboratory of Eco-environments in Three Gorges Reservoir Region（Ministry of Education）, Chongqing Key Laboratory of Plant Ecol- ogy and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing 400715, China;Agricultural Resources and Environment Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China)

机构地区：[1]西南大学生命科学学院,三峡库区生态环境教育部重点实验室,重庆市三峡库区植物生态与资源重点实验室,重庆400715 [2]广西农业科学院农业资源与环境研究所,南宁530007

出　　处：《农业环境科学学报》2017年第12期2421-2428,共8页Journal of Agro-Environment Science

基　　金：国家国际科技合作专项(2015DFA90900);中央财政林业科技推广示范资金项目(20170183);中央财政林业科技推广示范资金项目(渝林科研2016-8);三峡后续工作库区生态与生物多样性保护专项项目(5000002013BB5200002);中央高校基本科研业务费专项资金资助(XDJK2017D104)~~

摘　　要：为了解水淹胁迫对细胞壁镉富集能力的影响,以秋华柳(Salix variegata Franch)扦插苗为研究对象,设置镉胁迫和水淹胁迫试验,测定了不同处理组下秋华柳根、茎细胞壁不同组分的镉积累特征。结果表明:所有处理组秋华柳存活良好,表现出水淹和镉的双重耐受性;所有镉浓度处理下,秋华柳根、茎细胞壁果胶和半纤维素均具有良好的镉离子结合能力,其中果胶的镉离子结合能力最大;水淹、镉胁迫及两者的交互效应均对秋华柳根、茎细胞壁组分镉含量造成了不同程度的影响。水淹显著降低了茎细胞壁组分镉含量,但对根组分中镉含量无显著影响;水淹条件下,秋华柳根、茎细胞壁果胶和半纤维素镉含量有所降低,但果胶和半纤维素仍为细胞壁镉积累富集的主要组分。上述结果表明,水淹对秋华柳根、茎细胞壁组分中镉的分配策略没有明显改变,镉仍被固定于细胞壁中以减少重金属对植物细胞的伤害,因此秋华柳可以作为三峡库区消落带镉污染土壤修复的备选物种。The altered water regime in the Three Gorges Reservoir in the Yangtze River, China, has induced the formation of a hydro-fluctu- ation zone that has caused many serious environmental problems. Among them, the two main problems are high cadmium concentration in the sediment and anti-seasonal, long-term flooding. Revegetation has become one of the most important means of ecological restoration in the hydro-fluctuation zone of the Three Gorges Reservoir. Previous research has shown that Salix variegata, a native species in the Three Gorges Reservoir, can tolerate both flooding and cadmium stress, and thus is a promising candidate species for revegetation in the hydro- fluctuation zone of the Three Gorges Reservoir. However, the ability of S. variegata to tolerate and accumulate cadmium under flooding is still unclear. In order to investigate the effect of flooding on cadmium content in different cell wall components of the root and stem of S. vatiegata, cutting seedlings under two water regimes as control group （CK） and flooding group （FL） and four cadmium concentrations （0, 0.5, 2, and 10 mg ＂kg-~, achieved by adding CdClz＇2.5HzO to the soil） were studied via pot experiments. Sampling was carried out after 60 d of treatment, and the cadmium accumulation characteristics of different cell wall components of the root and stem of S. variegata under different cultivation were analyzed. The results showed as the following ： The survival rate of S. variegata for all treatments was high, which indicated high tolerance of this species to flooding and cadmium stresses; In all cadmium treatments, the pectin and hemicellulose of cell wall in the root and stem of S. variegata had good binding capacities to cadmium, and pectin had the highest binding capacity for cadmium; Water regime, cadmium concentration, and the interactions between these two factors had different impacts on the cadmium contents in different cell wall components of the root and stem of S. variegata. Flooding significantly reduced the cadmiu

关 键 词：秋华柳 镉胁迫 水淹 细胞壁 果胶 半纤维素 

分 类 号：X503.23[环境科学与工程—环境工程]