Effects of salt stress on the growth and osmotica accumulation of Coleus blumei

Abstract

Abstract: Potted Coleus blumei plants were treated with NaCl concentrations of 0 (control), 10, 50,100,150,or 200 mmol/L, and the effect of salt stress on growth, water status and osmotica accumulation were studied. Compared with the control, as NaCl concentration increased, the fresh weight, dry weight, water content and water potential decreased, while Na⁺, proline, soluble sugar content showed an upward trend. The contents of K⁺, Ca²⁺, Mg²⁺, NO₃^- were initially increased but then decreased, while free amino acid content showed the opposite trend. The results of high-performance liquid chromatography (HPLC) showed that the change rates of eight organic acids differed from each other. Synthetic analysis indicated that NaCl stress inhibited the growth of C. blumei, and the inhibitory effect on growth and water stress were enhanced as NaCl concentration increased. Under low salinity stress C. blumei accumulated the osmotica of inorganic ions such as Na⁺, Ca²⁺, Mg²⁺, NO₃^- etc, and organic matter such as proline, soluble sugar, ethanol acid, malonic acid, α-ketoglutarate and citric acid to adjust osmotic stress. To adjust osmotic stress at high salinities it accumulated osmotica such as Na⁺, proline, soluble sugar, free amino acid, malic acid, succinic acid, oxalic acid, glycolic acid and malonic acid. Therefore C. blumei accumulated different osmotica to adapt to osmotic stress under different NaCl salinity stresses.

CLC Number:

Q945.78

LIU Ai-rong, ZHANG Yuan-bing, ZHONG Ze-hua, WU Xia, ZHANG Ming. Effects of salt stress on the growth and osmotica accumulation of Coleus blumei[J]. Acta Prataculturae Sinica, 2013, 22(2): 211-218.

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