期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 111, 期 -, 页码 127-134出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2014.11.008
关键词
Castor bean; Drought stress; Cadmium accumulation; Root morphology
资金
- National Natural Science Foundation of China [31370515]
- Opening Foundation of the State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [10501-277]
This study aimed to test the hypothesis that root morphology and transpiration may have a crucial role in drought-induced change in cadmium (Cd) uptake and accumulation in plants. The biomass, Cd accumulation, spectral reflectance, gas exchange, and root morphology of castor bean were determined under different polyethylene glycols (PEG) concentrations (0%, 2.5%, 5%, and 10%) along with 0.2 mu M CdCl2 through a hydroponic experiment. All tested morpho-physiological parameters of the castor bean were unaffected upon exposure to 0.2 mu M CdCl2. PEG-induced drought stress repressed root growth, inhibited leaf gas-exchange, and reduced Cd uptake and accumulation in plants, but increased the photosynthetic pigment contents, as indicated by spectral reflectance indices. Cd accumulation in the roots and shoots, as well as the total Cd in the castor bean plants, positively correlated with plant growth, root/shoot ratio, total root length, surface area, root volume, root tips, and root length with the diameter classes of 0-0.2 mm, 0.2-0.4 mm, and 0.4-0.6 mm. No significant correlation was found between Cd accumulation and transpiration rate. Therefore, the drought-induced reduction of Cd uptake in castor plants may have resulted from the inhibition of root growth and alteration of root morphology, rather than from the decreased transpiration. (C) 2014 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据