Cadmium uptake by cucumber plants as affected by fluctuations in nutrient solution cadmium concentration during growth
作者:
FilipM.G. Tack,
Juan Esteban‐Mozo,
MarcG. Verloo,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1998)
卷期:
Volume 29,
issue 19-20
页码: 3015-3021
ISSN:0010-3624
年代: 1998
DOI:10.1080/00103629809370173
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A nutrient solution experiment was performed to assess the importance of fluctuations in substrate cadmium (Cd) concentrations during plant growth on Cd uptake by cucumber plants (Cucumis sativusL.). Nutrient solution Cd was varied between 0 and 5 μg L‐1in a way that the average Cd concentration over the entire growth period was 2.5 μg L‐1for all treatments. Slight but significant (p=0.05) differences in shoot dry matter yield reflected a negative effect of Cd on growth. Alternating Cd in solution every two days between 1.5 and 3.5 mg L‐1or between 0 and 5 μg L‐1had no different effect than supplying a constant Cd level of 2.5 μg L‐1during growth and indicated a linear response of the plant to substrate Cd concentration. Experimental treatments where Cd in solution either decreased or increased during the growing period resulted in a lower and a higher plant Cd concentration, respectively, compared to the treatment involving a constant solution Cd concentration of 2.5 μg L‐1. Short time random fluctuations in solution Cd concentration will not influence the final Cd concentrations in crops. Prediction of Cd uptake from soil extraction data will be most reliable when based on a good estimate of the average soil solution concentration towards the end of the plant growing period.
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