摘要
研究了在不同Cd浓度(0、5、100、200μg·g-1)处理下,互花米草花序、叶、茎、根茎、须根中Cd含量、积累量、转运特征,及Cd在互花米草体内的亚细胞分布。结果表明,Cd在互花米草不同器官中的积累能力存在较大差异。茎、根茎、须根中Cd含量及积累量随处理浓度的增加而升高,其中须根中Cd含量及积累量均高于其他器官。Cd处理浓度为100gμ·g-1时,花序和叶中Cd含量达到最大值,分别为8.65和7.82μg·g-1。在Cd处理浓度为200μg·g-1时,须根中Cd含量可高达390.00μg·g-1,积累量达3200μg·株-1。Cd在互花米草体内转运能力极低,绝大部分Cd积累在地下部位。Cd在互花米草亚细胞中的分布规律为细胞壁>胞液>细胞器。随着Cd处理浓度的增加,Cd在细胞壁中的分配比例增大,胞液中Cd分布比例则相应减小,细胞壁和胞液相互协调,增强互花米草对重金属Cd的耐性。
A pot culture experiment was conducted to study the accumulation, translocation, and subcellular distribution of cadmium （Cd） in different organs of Spartina alterniflora under effects of different concentrations （0, 5, 100, and 200μg·g-1） of Cd application. There was a greater difference in the Cd-accumulation capability of different S. alterniflora organs. The Cd content and the Cd accumulated amount in the stem, rhizome, and fine root increased with increasing concentration of Cd application, and fine root had the highest Cd content and the highest Cd accumulation. When the concentration of Cd application was 100 μg·g-1, the Cd content in inflorescence and leaf reached to the maximum, being 8.65 and 7.82 μg·g-1, respectively. When the concentration of Cd application was 200 μg·g-1, the Cd content in fine root could reach 390.00 μg·g-1, and the Cd accumulation was 3200 μg·plant-1. The Cd in S. alterniflora plant had a very low translocation capability. Most of the absorbed Cd was accumulated in root. The subcellular distribution of Cd was in the order of cell wall cytoplasmic supernatant cell organella. With the increasing concentration of Cd application, the allocation proportion of Cd in cell wall increased, while that in cyplasmic supernatant decreased correspondingly, suggesting that cell wall coordinated with cytoplasmic supernatant to enhance the Cd tolerance of S. alterniflora.
出处
《生态学杂志》
CAS
CSCD
北大核心
2012年第3期526-531,共6页
Chinese Journal of Ecology
基金
国家科技基础性工作专项(2007FY110500-08)
天津港科技计划项目资助
关键词
CD
互花米草
积累
转运
亚细胞分布
Cd
Spartina alterniflora
accumulation
translocation
subcellular distribution.
