eCite Digital Repository

Learning from halophytes: physiological basis and strategies to improve abiotic stress tolerance in crops

Citation

Shabala, S, Learning from halophytes: physiological basis and strategies to improve abiotic stress tolerance in crops, Annals of Botany, 112, (7) pp. 1209-1221. ISSN 0305-7364 (2013) [Refereed Article]

Copyright Statement

Copyright The Author 2013. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oup.com

DOI: doi:10.1093/aob/mct205

Abstract

Background: Global annual losses in agricultural production from salt-affected land are in excess of US$12 billion and rising. At the same time, a significant amount of arable land is becoming lost to urban sprawl, forcing agricultural production into marginal areas. Consequently, there is a need for a major breakthrough in crop breeding for salinity tolerance. Given the limited range of genetic diversity in this trait within traditional crops, stress tolerance genes and mechanisms must be identified in extremophiles and then introduced into traditional crops.

Scope and Conclusions: This reviewargues that learning from halophytes may be a promisingway of achieving this goal. The paper is focused around two central questions: what are the key physiological mechanisms conferring salinity tolerance in halophytes that can be introduced into non-halophyte crop species to improve their performance under saline conditions and what specific genes need to be targeted to achieve this goal? The specific traits that are discussed and advocated include: manipulation of trichome shape, size and density to enable their use for external Na+ sequestration; increasing the efficiency of internal Na + sequestration in vacuoles by the orchestrated regulation of tonoplast NHX exchangers and slow and fast vacuolar channels, combined with greater cytosolic K + retention; controlling stomata aperture and optimizing water use efficiency by reducing stomatal density; and efficient control of xylem ion loading, enabling rapid shoot osmotic adjustment while preventing prolonged Na + transport to the shoot.

Item Details

Item Type:Refereed Article
Keywords:salinity, drought, stomata, vacuole, epidermal, bladder, trichome, sodium sequestration, cytosolic potassium, xylem loading, osmotic adjustment, membrane potential
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Winter Grains and Oilseeds
Objective Field:Barley
Author:Shabala, S (Professor Sergey Shabala)
ID Code:86963
Year Published:2013
Web of Science® Times Cited:155
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2013-11-04
Last Modified:2014-05-28
Downloads:0

Repository Staff Only: item control page