Induction of Increased Salt Tolerance in Sorghum bicolor by NaCl Pretreatment

Amzallag, G.N. and Lerner, H.R. and Poljakoff-Mayber, A. (1990) Induction of Increased Salt Tolerance in Sorghum bicolor by NaCl Pretreatment. Journal of Experimental Botany, 41 (222). pp. 29-34.

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Abstract

Following 20 d of exposure to 75 or 150 mol m−3 NaCl Sorghum bicolor (L.) Moench plants become capable of growing in medium containing 300 mol m−3 NaCl. Control plants, which have not been pretreated, or plants pretreated for less than 20 d die within 2 weeks when exposed to 300 mol m−3 NaCl. We consider this induction of a capacity to survive in and tolerate a high NaCl concentration as an adaptation to salinity. We suggest that adaptation to salinity is more than osmotic adjustment and that it takes longer to develop than osmotic adjustment. Concomitantly with the appearance of the ability to grow in high salinity, adaptation also comprises the development of a capacity to regulate internal Na+ and Cl− concentrations, even when external salinity is high. Shoot mean relative growth rates are similar for both control plants and for adapted plants growing in 300 mol m−3 NaCl, although their shoot Na+ and Cl− concentrations are quite different. Based on these data, we propose that adaptation of Sorghum to high salinity results from a modulation of genome expression occurring during extended exposure to non-lethal NaCl concentrations.

Item Type:	Article
Uncontrolled Keywords:	Sorghum bicolor (L.) Moench, NaCl, salt tolerance, adaptation to salinity
Author Affiliation:	Department of Botany, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
Subjects:	Plant Protection
Divisions:	Sorghum
Depositing User:	Mr B Krishnamurthy
Date Deposited:	04 Feb 2015 08:03
Last Modified:	04 Feb 2015 08:03
Official URL:	http://dx.doi.org/10.1093/jxb/41.1.29
URI:	http://eprints.icrisat.ac.in/id/eprint/13509

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