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Physiology of acclimation to salinity stress in pea (Pisum sativum)

Citation

Pandolfi, C and Mancuso, S and Shabala, S, Physiology of acclimation to salinity stress in pea (Pisum sativum), Environmental and Experimental Botany, 84 pp. 44-51. ISSN 0098-8472 (2012) [Refereed Article]

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Copyright Statement

Copyright 2012 Elsevier B.V.

DOI: doi:10.1016/j.envexpbot.2012.04.015

Abstract

Pea (Pisum sativum L.) seedlings were grown in half strength Hoagland solution and exposed to 0, 10, 25 mM NaCl and 2.5% PEG 6000 for 1 week (pre-treatment). Thereafter plants were exposed to 0 and 80 mM NaCl for 2 weeks (main treatment). The control plants were maintained in half strength Hoagland solution without NaCl. Various physiological parameters were recorded from control, pretreated and non-pretreated plants. There was no negative effect of the pre-treatments on growth (total fresh and dry matter production), and plants pre-treated with 10 mM NaCl had biomass accumulation equal to control plants. The beneficial effect of salt acclimation was also evident in the prevention of K+ leakage and Na+ accumulation, primary in roots, suggesting that here the physiological processes play the major role. 2.5% PEG 6000 was not as efficient as salt in enhancing salt tolerance and acclimation appears to be more related to ion-specific rather than osmotic component of stress. We also recorded an increase of the xylem K/Na in the salt acclimated plants. Therefore, the present study reveals that short-term exposure of the glycophyte P. sativum species activates a set of physiological adjustments enabling the plants to withstand severe saline conditions, and while acclimation takes place primary in the root tissues, control of xylem ion loading and efficient Na+ sequestration in mesophyll cells are also important components of this process.

Item Details

Item Type:Refereed Article
Keywords:salinity, hardening, acclimation, xylem sap, osmolality, potassium, sodium
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Crop and Pasture Biochemistry and Physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Winter Grains and Oilseeds
Objective Field:Grain Legumes
Author:Shabala, S (Professor Sergey Shabala)
ID Code:78667
Year Published:2012
Web of Science® Times Cited:28
Deposited By:Agricultural Science
Deposited On:2012-07-17
Last Modified:2013-05-14
Downloads:3 View Download Statistics

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