Effects of epibrassinolide on ion absorption and distribution in Medicago species under NaCl stress

doi:10.11686/cyxb2017413

Abstract

Abstract: The aim of this study was to explore the mechanism of salt tolerance of Medicago species and the effect of exogenous brassinolide on salt tolerance of Medicago species. NaCl stress and the effects of epibrassinolide (EBR) on biomass, uptake, distribution and transport of Medicago species were studied under NaCl stress. Medicago truncatula, M. polymorphal and M. polymorpha were selected as experimental materials. The results show that NaCl stress inhibited the growth of Medicago plants and affect the distribution of K⁺, Ca²⁺, Mg²⁺ in plants. EBR effectively relieved the inhibitory effect of NaCl stress on plant growth, maintaining ion balance in plants and improving tolerance to salt. Salt tolerance in M. sativa was strong whereas tolerance in M. truncatula was poor. Under salt stress, the roots of M. sativa inhibited the uptake of Na⁺ to reduce the toxicity effects. M. truncatula transported Na⁺ from roots to the stem and leaves.

Key words: Medicago truncatula, Medicago sativa, Medicago polymorpha, salt stress, ion metabolism, 2, 4-epibrassinolide

WANG Xiao-shan, JI Xiao-min, LIU Long-yang, JI Bing-qin, TIAN Yin-fang. Effects of epibrassinolide on ion absorption and distribution in Medicago species under NaCl stress[J]. Acta Prataculturae Sinica, 2018, 27(9): 110-119.

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