Effects of copper and mineral nutrition on growth, copper accumulation and mineral element uptake in two Rumex japonicus populations from a copper mine and an uncontaminated field sites

被引:86
作者
Ke, Wenshan
Xiong, Zhi-Ting [1 ]
Chen, Shijian
Chen, Jianjun
机构
[1] Wuhan Univ, Dept Environm Sci, Wuhan 430079, Peoples R China
[2] Hubei Univ, Coll Life Sci, Wuhan 430062, Peoples R China
[3] Chinese Acad Sci, Inst Geodesy & Geophys, Wuhan 430077, Peoples R China
基金
中国国家自然科学基金;
关键词
copper tolerance; nutrient deficiency; mineral element accumulation; Rumex japonicus;
D O I
10.1016/j.envexpbot.2005.10.007
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Two Rumex japonicus populations, one from a copper mine and the other from an uncontaminated site, were studied in hydroponic experiments for the plant growth, copper accumulation and mineral nutrient content under excess copper and nutrient deficiency conditions. The tolerance indices of the contaminated population were significantly higher than that of the uncontaminated population, indicating the evolution of Cu resistance in the former. At control and low Cu treatment, there was no difference in Cu accumulation in roots between the two populations. At high Cu (100 mu M) treatment, however, the contaminated population accumulated less Cu in roots than the uncontaminated one, suggesting the root exclusion mechanism existing in the former. The contaminated population was also more tolerant to general nutrient deficiency than the uncontaminated one. The results indicated that the contaminated population had evolved not only Cu-tolerance but also tolerance to low nutrient supply. Under Cu stress, the contaminated population had less change in nutrient composition than the uncontaminated one. The similar result was observed in general nutrient deficiency experiment. The results indicated that the mineral composition homeostasis under the stresses was important in metal tolerance and colonizing the Cu-enriched soils for the Cu-tolerant population. At high Cu (100 mu M) treatment and general nutrient deficiency treatment, the contaminated population accumulated significantly lower copper and higher phosphorus in both roots and shoots than the uncontaminated one. This was not the case for other mineral nutrients Ca, Mg and Fe except for root Mg and root Fe at Cu treatment. The result suggested that the high Ca-metabolism in R. japonicus was uncorrelated with high Cu-tolerance and that P might play an important role in governing Cu bioaccumulation. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:59 / 67
页数:9
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