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Genotypic difference in salinity tolerance in quinoa is determined by differential control of xylem Na+ loading and stomatal density


Shabala, S and Hariadi, Y and Jacobsen, S-E, Genotypic difference in salinity tolerance in quinoa is determined by differential control of xylem Na+ loading and stomatal density, Journal of Plant Physiology, 170, (10) pp. 906-914. ISSN 0176-1617 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier GmbH.

DOI: doi:10.1016/j.jplph.2013.01.014


Quinoa is regarded as a highly salt tolerant halophyte crop, of great potential for cultivation on saline areas around the world. Fourteen quinoa genotypes of different geographical origin, differing in salinity tolerance, were grown under greenhouse conditions. Salinity treatment started on 10 day old seedlings. Six weeks after the treatment commenced, leaf sap Na and K content and osmolality, stomatal density, chlorophyll fluorescence characteristics, and xylem sap Na and K composition were measured. Responses to salinity differed greatly among the varieties. All cultivars had substantially increased K+ concentrations in the leaf sap, but the most tolerant cultivars had lower xylem Na+ content at the time of sampling. Most tolerant cultivars had lowest leaf sap osmolality. All varieties reduced stomata density when grown under saline conditions. All varieties clustered into two groups (includers and excluders) depending on their strategy of handling Na+ under saline conditions. Under control (non-saline) conditions, a strong positive correlation was observed between salinity tolerance and plants ability to accumulate Na+ in the shoot. Increased leaf sap K+, controlled Na+ loading to the xylem, and reduced stomata density are important physiological traits contributing to genotypic differences in salinity tolerance in quinoa, a halophyte species from Chenopodium family.

Item Details

Item Type:Refereed Article
Keywords:osmotic adjustmen, potassium, sodium, transpiration, xylem sap, chenopodium, chenopodium quinoa
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Environmentally sustainable plant production
Objective Field:Environmentally sustainable plant production not elsewhere classified
UTAS Author:Shabala, S (Professor Sergey Shabala)
UTAS Author:Hariadi, Y (Mr Yuda Hariadi)
ID Code:86956
Year Published:2013
Web of Science® Times Cited:124
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2013-11-04
Last Modified:2014-04-16

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