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Genotypic differences in agro-physiological, biochemical and isotopic responses to salinity stress in quinoa (Chenopodium quinoa Willd.‎) plants: Prospects for salinity tolerance and yield stability

Quinoa is an important nutritive crop that can play a strategic role in the development of marginal and degraded lands.‎ Genotypic variations in carbon isotope composition (δ13C), carbon isotope discrimination (Δ13C), ratio of intercellular to atmospheric CO2 concentration (Ci/Ca), intrinsic water use efficiency (iWUE), seed yield and grain protein contents were analyzed in 6 quinoa cultivars grown in the field under saline conditions (0, 10, 20 dSm−1).‎ Significant variations occurred in dry biomass, seed yield, plant height, number of branches, number of panicles, panicle weight, harvest index, N and C content.‎ Some genotypes produced yields with values significantly higher than 2.‎04 t ha−1 (Q12), with an average increased to 2.‎58 t ha−1 (AMES22157).‎ The present study indicates a large variation in Δ13C for salinity treatments (3.‎43‰)‎ and small magnitude of variations among genotypes (0.‎95‰)‎.‎ Results showed that Δ might be used as an important index for screening, and selection of the salt tolerant quinoa genotypes with high iWUE.‎ Quinoa genotypes differs in foliar 13C and 15N isotope composition, which reflected complex interactions of salinity and plant carbon and nitrogen metabolisms.‎ Grain protein contents were found higher in Q19 and Q31 and lowest in Q26.‎ The study demonstrates that AMES22157 and Q12, were salt tolerant and high yielder while the AMES22157 was more productive.‎ This study provides a reliable measure of morpho-physiological, biochemical and isotopic responses of quinoa cultivars to salinity in hyper arid UAE climate and it may be valuable in the future breeding programs.‎ The development of genotypes having both higher water use efficiency and yield potential would be a very useful contribution for producers in the dry region of Arabian Peninsula.‎

Authors: 
M.‎ Iftikhar Hussain, Abdullah J.‎ Al- Dakheel, Manuel J.‎ Reigosa
Year: 
۲۰۱۸
Publication type: 
Scientific Paper
Publication Source: 
Plant Physiology and Biochemistry
Volume/Chapter/Issue: 
۱۲۹
Page Number: 
٤۱۱-٤۲۰