生态环境学报2009，Vol.18Issue(5)：1863-1868,6.
镉胁迫对不同水稻品种幼苗根系形态和生理特性的影响
Effect of cadmium on root morphology and physiological characteristics of rice seedlings
摘要
Abstract
Cadmium (Cd) is one of the most toxic pollutants in the soil, which could limit plant growth and crop productivity. In order to explore the toxicity of cadmium to rice root, root morphology and physiological characteristics of two rice cultivars (Xiushui 63 and Xiushui 09) were studied with roots exposed to different Cd concentration (0、1、5、10、25、 50、100 μmol·L~(-1)) in hydroponic culture. The results showed that a slight stimulatory effect on root growth was observed under 1 μmol·L~(-1) Cd level, with slight in-crease in dry weight, total root length, root surface-area, root volume and root activity. However, with the increase in Cd concentra-tion (10～100 μmol·L~(-1)), an obvious decrease was found in dry weight, root length, root surface-area, root volume and root activity for Xiushui 63 and Xiushui 09 exposed to 10 and 25 μmol·L~(-1) Cd, respectively, as compared with the control. In contrast, an increase in the average root diameter and relative permeability of plasma membrane was observed with the increase of Cd concentration. Roots with diameter≤1.5 mm of the two rice cultivars were affected significantly by different Cd concentration. Root length, root sur-face-area and root volume of roots with diameter≤1.5 mm for Xiushui 63 at Cd concentrations≥10 μmol·L~(-1) decreased 11.89%～55.39%, 10.77%～57.27% and 18.37%～67.35%, and those for Xiushui 09 were 6.84%～40.48%, 8.55%～42.79% and 16.50%～52.42%. Based on the results of this study, we can conclude that there was genotypic difference in rice in response to Cd toxicity, and Xiushui 09 was more tolerant to Cd stress than Xinshui 63.关键词
镉/水稻/根系形态/生理特性Key words
cadmium/ rice/ root morphology/ physiological characteristics分类
资源环境引用本文复制引用
何俊瑜,王阳阳,任艳芳,周国强,杨良静..镉胁迫对不同水稻品种幼苗根系形态和生理特性的影响[J].生态环境学报,2009,18(5):1863-1868,6.基金项目
农业部作物营养与施肥重点实验室开放基金项目 （）
贵州省自然科学基金项目(20072058) （20072058）
