[Impact of salinity on accumulation of several metal elements in Bruguiera gymnorrhiza seedlings and Ca effect].
The contents of K, Ca, Na and Mg in different organs of Bruguiera gymnorrhiza seedlings cultured in sand bases with solutions of 400 mmol.L-1 NaCl and different concentrations of CaCl2 were determined. In the treatment of 400 mmol.L-1 NaCl, Na was largely accumulated in organs, which caused the decrease of K/Na and Ca/Na, and decreased dry matter accumulation in seedlings. Supplemental CaCl2 decreased the accumulation of Na in seedlings, increased the rations of K/Na and Ca/Na and the accumulation of dry matter, and thereby, mitigated salt stress. The suitable concentration of CaCl2 was 10-15 mmol.L-1. It was concluded that B. gymnorrhiza seedlings cultured at high salinity accumulated more metal ions, which enhanced osmotic adjustment of plants, and kept highly selective absorption of K/Na. These characteristics are the main physiological mechanisms of the adaptation of B. gymnorrhiza to high salinity in estuary and coast, while suitable Ca/Na in soil is one of the important causes that B. gymnorrhiza can survive and regenerate in high salinity coast.
Li
Y
Y
Xiamen University, Xiamen 361005. LYP@ast590.tea.ac.cn
Lin
P
P
D002118:Calcium / Q000494:pharmacology*; D008670:Metals / Q000378:metabolism*; D012965:Sodium Chloride / Q000494:pharmacology*; D014197:Trees / Q000378:metabolism*
D008670:Metals; D012965:Sodium Chloride; D002118:Calcium