Na+/H+ANTIPORTER OVEREXPRESSION FOR DEVELOPING SALT TOLERANCE IN PLANTS

Main Article Content

Praveen Mamidala

Keywords

Antiporter, NHX1, Transgenic Plants, Salt Tolerance, Abiotic Stress

Abstract

Na+/H+ antiporter play a major role in pH and Na+ homeostasis of cells throughout the biological kingdom, including bacteria, algae, fungi, worms, higher plants, and mammals, including humans. Plant vacuolar Na+/H+ antiporter have been shown to play important roles in cellular ion homeostasis, including the sequestration of Na+ ions into the vacuole, and vacuolar pH regulation. Over-expression of AtNHX1 and homologues from other plants has been shown to confer significant salt tolerance in a variety of plant species as a result of increased vacuolar sequestration of sodium ions. One possible mechanism by which plants could survive salt stress is to compartmentalize sodium ions away from the cytosol.  Both the literature and public databases contain the data of many plant antiporters and their over-expression studies in model and crop plants improved salt tolerance in plants. The current review projects on transgenic plants with salt tolerance reported so far with over-expression of Na+/H+ antiporter under constitutive and inducible promoters and it sheds light on various antiporters which developed resistance to salt. Phylogenetic studies of various NHX1 revealed their close relativeness among all the antiporters reported so far. From the current review, scientists can pick up closely related families for overexpression of antiporter genes to generate transgenic plants resistance to salt for improving yield of crop and ornamental plants as well.

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