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Front Plant Sci. 2016 Jul 28;7:1104. doi: 10.3389/fpls.2016.01104. eCollection 2016.

Polyamines Confer Salt Tolerance in Mung Bean (Vigna radiata L.) by Reducing Sodium Uptake, Improving Nutrient Homeostasis, Antioxidant Defense, and Methylglyoxal Detoxification Systems.

Author information

1
Laboratory of Plant Stress Responses, Faculty of Agriculture, Kagawa UniversityKagawa, Japan; Department of Agricultural Botany, Faculty of Agriculture, Sher-e-Bangla Agricultural UniversityDhaka, Bangladesh.
2
Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University Dhaka, Bangladesh.
3
Laboratory of Plant Stress Responses, Faculty of Agriculture, Kagawa UniversityKagawa, Japan; Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural UniversityDhaka, Bangladesh.
4
Laboratory of Plant Stress Responses, Faculty of Agriculture, Kagawa University Kagawa, Japan.
5
Laboratory of Plant Stress Responses, Faculty of Agriculture, Kagawa UniversityKagawa, Japan; Department of Agroforestry and Environmental Science, Faculty of Agriculture, Sher-e-Bangla Agricultural UniversityDhaka, Bangladesh.
6
Biomass Chemistry Laboratory, Bioresource Science for Manufacturing, Department of Applied Bioresource Science, Faculty of Agriculture, Kagawa University Kagawa, Japan.

Abstract

The physiological roles of PAs (putrescine, spermidine, and spermine) were investigated for their ability to confer salt tolerance (200 mM NaCl, 48 h) in mung bean seedlings (Vigna radiata L. cv. BARI Mung-2). Salt stress resulted in Na toxicity, decreased K, Ca, Mg, and Zn contents in roots and shoots, and disrupted antioxidant defense system which caused oxidative damage as indicated by increased lipid peroxidation, H2O2 content, [Formula: see text] generation rate, and lipoxygenase activity. Salinity-induced methylglyoxal (MG) toxicity was also clearly evident. Salinity decreased leaf chlorophyll (chl) and relative water content (RWC). Supplementation of salt affected seedlings with exogenous PAs enhanced the contents of glutathione and ascorbate, increased activities of antioxidant enzymes (dehydroascorbate reductase, glutathione reductase, catalase, and glutathione peroxidase) and glyoxalase enzyme (glyoxalase II), which reduced salt-induced oxidative stress and MG toxicity, respectively. Exogenous PAs reduced cellular Na content and maintained nutrient homeostasis and modulated endogenous PAs levels in salt affected mung bean seedlings. The overall salt tolerance was reflected through improved tissue water and chl content, and better seedling growth.

KEYWORDS:

ROS signaling; abiotic stress; methylglyoxal; oxidative damage; polyamine; salinity

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