期刊
PLANT AND SOIL
卷 342, 期 1-2, 页码 359-367出版社
SPRINGER
DOI: 10.1007/s11104-010-0700-z
关键词
Copper toxicity; Cowpea; Phosphorus deficiency; Plant growth
资金
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC-CARE) [3-03-05-09/10]
- Environment Protection Authority (EPA) Victoria
Anthropogenic contamination with Cu is an important issue and it is necessary to understand how Cu toxicity influences the uptake/acquisition of nutrients by plants. An experiment was conducted with soil-grown cowpea (Vigna unguiculata (L.) Walp.) to investigate the interaction between Cu toxicity and P deficiency. Plant performance was related to the activity of Cu2+ at the outer surface of the root plasma membrane, {Cu2+} (0) (o) , which was calculated from properties of the soil solution. The addition of Cu to the soil was found to reduce growth of plant shoots by inducing Cu toxicity, which was associated with a reduction in the shoot tissue Fe concentration. The critical value (50% reduction in shoot growth) determined for {Cu2+} (0) (o) in this soil-based experiment (3.8 mu M) corresponds well to values determined previously. Importantly, regression analyses indicated that although the alleviation of P deficiency improved overall growth, the P-status of the plant did not influence the apparent toxicity of the Cu. This result was unexpected, given that Cu inhibits the growth of roots hairs; these being important for the uptake of immobile nutrients such as P. This study advances our understanding of Cu toxicity and its impact upon nutrient uptake.
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