CU-IONS MEDIATED CHANGES IN GROWTH, CHLOROPHYLL AND OTHER ION CONTENTS IN A CU-TOLERANT KOELERIA-SPLENDENS

被引：57

作者：

OUZOUNIDOU, G

机构：

[1] Department of Botany, Aristotle University of Thessaloniki, Thessaloniki

来源：

BIOLOGIA PLANTARUM | 1995年 / 37卷 / 01期

关键词：

CALCIUM; COPPER; IRON; MAGNESIUM; POTASSIUM; ROOT BIOMASS; ROOT LENGTH;

D O I：

10.1007/BF02913000

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The effects of Cu2+ on growth, chlorophyll and other ion contents of Koeleria splendens originated from Cu-contaminated soil have been investigated in nutrient solution. The most evident Cu2+ effects concern the root growth, especially the root length. Since in plants grown under lower Cu2+ concentrations (4 and 8 muM) root elongation, biomass, chlorophyll, Mg2+, Fe2+, Ca2+ and K+ content were increased compared with the control, the development of an adaptive mechanism of K. splendens to Cu2+ is suggested. High Cu2+ concentration (160 muM) caused a significant reduction in root length and biomass as well as a decreased rate of chlorophyll biosynthesis. The reduction of growth can be correlated with the toxic effect of Cu2+ on photosynthesis, root respiration and protein synthesis in roots. 160 muM Cu2+-treatment had a negative influence on the concentrations of Ca2+, Fe2+, Mg2+ and K+ and a positive influence on the Cu2+ concentration in the plant tissues. Loss of nutrients similar to the senescence response suggests that excess of Cu2+ leads to the progressive senescence of the plants. Our results demonstrate the existence of an adaptive mechanism of K. splendens under low Cu2+ concentrations, while high Cu2+ quantities cause disturbances in plant function.

引用

页码：71 / 78

页数：8

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