The focus of the review is on the specific aspects of nickel effect on plants as compared to other heavy metals; their specificity is derived from different physical and chemical properties. The various facets of the physiological role of nickel and its toxic activity in higher plants, its intracellular partition and transport in plant tissues and organ are discussed. The putative mechanisms of nickel hyperaccumulation are considered in several representatives of angiosperm plant families. The existing evidence was used to outline the metabolic changes in plants affected by nickel. The comparison with other heavy metals is used to disclose the general mechanisms that disturb plant mineral nutrition, water regime, photosynthesis, and morphogenesis as well as the common cell responses aimed at detoxification of heavy metals. The numerous nonspecific effects of heavy metals depend on their direct and indirect action; in addition, some effects of nickel are specific. To illustrate, high Ni content in endoderm and pericycle cells blocks cell divisions in the pericycle and results in the inhibition of root branching.
Russian Journal of Plant Physiology – Springer Journals
Published: Mar 24, 2006
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