PJB-2017-593
COPPER-INDUCED SIMILAR CHANGES IN GROWTH AND PHYSIOLOGICAL RESPONSES OF PLANTS GROWN FROM DIMORPHIC SEEDS OF SUAEDA SALSA, A COPPER-TOLERANT HALOPHYTE
Li Jiang
Abstract
In order to test the hypothesis that plants grown from dimorphic seeds of Suaeda salsa have high copper (Cu) tolerance, and differ in Cu tolerance, we have examined effects of Cu on plant growth, copper accumulation, concentrations of chlorophyll and other mineral elements of both types of plants by using pot experiment. The results demonstrated that, though Cu significantly influences dry weight and chlorophyll as well as most mineral elements, there were no differences in tolerant responses and copper accumulation between plants from dimorphic S. salsa seeds. Dry weight and tolerance index did not significantly decrease until after 800 mg kg-1 Cu. Chlorophyll concentrations increased at first and then decreased with the increase of Cu concentrations. Roots accumulated higher level of Cu than shoots. The bioconcentration factor and translocation factor were less than 1.0 under all Cu addition treatments. Our study is the first report of ecophysiological responses of plants grown from heteromorphic seeds to heavy metal and suggests that both types of S. salsa plants, considered as Cu-tolerant halophyte, exhibit similar response to Cu.
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