Changes of phytohormones content in halo- and glycophytes under salinity

N P Vedenicheva,L A Stetsenko,L I Musatenko,N I Sevyakova,L V Voytenko

doi:10.30970/sbi.0501.130

Abstract

Phytohormonal balance changes in plants with contrast salt resistance – glycophyte Phaseolus vulgaris L. and halophyte Mesembryanthemum crystallinum L. – under salt stress (NaCl) were studied. It was assumed that salt tolerance of M. crystallinum is dependent on hormonal balance peculiarities, namely on, extremely low ABA level combined with high amount of IAA and cytokinins. Keywords: phytohormones, abscisic acid, indolyl-3-acetic acid, cytokinins, glycophytes, halophytes, stress, salinity, salt tolerance.

Highlights

Over 6% of the world’s land is affected by salinity and a proportion of salt-affected cultivated land arises every year as a result of irrigation
We assume that under salinity ABA is synthesized in root both de novo and released from stored forms and transported to leaves where the excess of this hormone is inactivated by conjugation
This is confirmed by the data obtained on wheat where stress-induced ABA accumulation was connected with its biosynthesis in roots and movement in free form to ground organs [26]

Summary

Introduction

Over 6% of the world’s land is affected by salinity and a proportion of salt-affected cultivated land arises every year as a result of irrigation. The presence of salt in the soil solution reduces the ability of the plant to take up water This is referred as the osmotic or water-deficit effect of salinity. If excessive amounts of salt enter the plant in the transpiration stream there will be damage to cells in the transpiring leaves and this may cause further reductions of growth. This is called as salt-specific or ion-excess effect of salinity [17]. The consequences of salinity are reduction of plant growth and enhancement of mature leaves senescence, resulting in a decrease in functional leaf area and, in crop yield.

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