Comparative Physiological and Biochemical Mechanisms of Salt Tolerance in Four Quinoa Cultivars Under Varying Salinity and Sodicity Levels.

Autor: Zafar, Asma, Murtaza, Ghulam, Afzal, Irfan, Farooqi, Zia Ur Rahman, Shen, Weibo, Raza, Ali
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Zdroj: Journal of Plant Growth Regulation; Aug2024, Vol. 43 Issue 8, p2888-2904, 17p
Abstrakt: Salinization and sodication present significant threats to crop productivity in many parts of the world including Pakistan. Cultivating halophytes like quinoa presents a viable solution for the profitable use of salt-affected lands. This study specifically examines the performance and salt tolerance mechanism of four quinoa accessions under varying salinity and sodicity levels. In addition to a control group, different combinations of electrical conductivity and sodium adsorption ratio (ECe dS m−1 SAR levels) were established: 10:20, 10:40, 20:20, and 20:40, achieved by using a mixture of salts. Most of the quinoa cultivars exhibited robust growth, with the exception of GLN-22, which proved unable to withstand high levels of salinity and sodicity, resulting in a 78% reduction in yield. GLN-29, on the other hand, demonstrated superior performance across all levels of salinity and sodicity. UAF-Q7 excelled under conditions of high salinity and low sodicity compared to equivalent salinity levels but elevated sodicity. Meanwhile, GLN-33 exhibited enhanced growth under elevated sodicity levels but struggled in the face of high salinity stress. In terms of nutrient uptake, GLN-29 displayed a higher accumulation of Na+ (32%) in older leaves compared to younger ones, alongside elevated levels of antioxidant activity at all salinity and sodicity levels. Notably, GLN-29 exhibited excellent adaptation to both high salinity and sodicity levels, resulting in the highest grain yield (14.75 g/pot) and the salt tolerance mechanism was associated with highly efficient K+ retention and transport of Na+ to older leaves. This underscores the necessity for further comprehensive field studies to ascertain its suitability for the sustainable utilization of salt-affected soils. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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