Supplemental feeding on rangelands: New dynamics of the livestock in the El Ouara rangelands in southern Tunisia

Rjili, Houda; Jaouad, Mohamed; Selmi, Chaker

doi:10.1016/j.regsus.2023.10.001

Cited by 1 publication

(1 citation statement)

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“…Hence, this valuable crop holds significant economic and industrial importance in Tunisia, particularly in the southern regions where it is the most cultivated cereal. It is a crucial crop for local agriculture due to its adaptability to arid climates and saline soils, making it a reliable source of income for farmers in these challenging environments 34 , 35 . However, in our previous study 32 , we showed that salinity had a direct effect on spike growth and spike development and through this an indirect effect on plant yield.…”

Section: Introductionmentioning

confidence: 99%

Mineral accumulation, relative water content and gas exchange are the main physiological regulating mechanisms to cope with salt stress in barley

Boussora,

Triki,

Bennani

et al. 2024

Sci Rep

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Salinity has become a major environmental concern for agricultural lands, leading to decreased crop yields. Hence, plant biology experts aim to genetically improve barley’s adaptation to salinity stress by deeply studying the effects of salt stress and the responses of barley to this stress. In this context, our study aims to explore the variation in physiological and biochemical responses of five Tunisian spring barley genotypes to salt stress during the heading phase. Two salinity treatments were induced by using 100 mM NaCl (T1) and 250 mM NaCl (T2) in the irrigation water. Significant phenotypic variations were detected among the genotypes in response to salt stress. Plants exposed to 250 mM of NaCl showed an important decline in all studied physiological parameters namely, gas exchange, ions concentration and relative water content RWC. The observed decreases in concentrations ranged from, approximately, 6.64% to 40.76% for K+, 5.91% to 43.67% for Na+, 14.12% to 52.38% for Ca2+, and 15.22% to 38.48% for Mg2+ across the different genotypes and salt stress levels. However, under salinity conditions, proline and soluble sugars increased for all genotypes with an average increase of 1.6 times in proline concentrations and 1.4 times in soluble sugars concentration. Furthermore, MDA levels rose also for all genotypes, with the biggest rise in Lemsi genotype (114.27% of increase compared to control). Ardhaoui and Rihane showed higher photosynthetic activity compared to the other genotypes across all treatments. The stepwise regression approach identified potassium content, K+/Na+ ratio, relative water content, stomatal conductance and SPAD measurement as predominant traits for thousand kernel weight (R2 = 84.06), suggesting their significant role in alleviating salt stress in barley. Overall, at heading stage, salt accumulation in irrigated soils with saline water significantly influences the growth of barley by influencing gas exchange parameters, mineral composition and water content, in a genotype-dependent manner. These results will serve on elucidating the genetic mechanisms underlying these variations to facilitate targeted improvements in barley's tolerance to salt stress.

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Section: Introductionmentioning

confidence: 99%