Identification of salt-tolerant genetic resources is of high importance due to the constant increase in salt-affected areas.

This study was conducted to assess genetic variation in salt response among and within Tunisian sea barley populations and to identify useful genotypes for future breeding programmes directed towards improving salinity tolerance.

The salinity response of 141 lines from 10 natural populations of Hordeum marinum ssp. marinum was characterised at a morphophysiological level, following exposure to 200 mM sodium chloride for 90 days.

ANOVA revealed significant differences in growth and ion accumulation between and within populations in response to salinity. The Sebkhet Ferjouna population was less affected than Sidi Othman and Tabarka; however, it accumulated relatively higher sodium and lower potassium and potassium/sodium ratio. Stress Tolerance Index (STI) and Salt Tolerance (ST) values varied significantly among populations and lines. STI was positively correlated with potassium and negatively correlated with sodium content in roots and leaves, whereas no evidence of a relationship between both cations and ST was observed.

SO7, SO28, LB5, LB25, TB1, MT3 and BK12 with high values of STI were identified as high yielding lines in control and salt stress conditions, whereas MT3, BK12, MT17, BF10, SL8, SL16 and SF32, with the highest values of ST, were characterised by a small yield loss and low sensitivity when exposed to salinity.

These lines constitute a genetic resource with desirable adaptation characteristics for breeding programmes towards salinity tolerance in cultivated cereals.

随着受盐影响地区的不断增加，耐盐遗传资源的鉴定变得非常重要。

这项研究的目的是评估突尼斯海大麦群体之间和内部盐反应的遗传变异，并为未来旨在提高耐盐性的育种计划确定有用的基因型。

大麦10 个自然群体的 141 个品系的盐度响应。在暴露于 200 mM 氯化钠 90 天后，对marinum进行了形态生理学水平的表征。

方差分析显示种群之间和种群内的生长和离子积累对盐度的响应存在显着差异。 Sebkhet Ferjouna 人口受到的影响小于 Sidi Othman 和 Tabarka；然而，它积累了相对较高的钠和较低的钾和钾/钠比。胁迫耐受指数（STI）和盐耐受性（ST）值在群体和品系之间存在显着差异。 STI 与根和叶中的钾含量呈正相关，与钠含量呈负相关，但没有观察到这两种阳离子与 ST 之间存在关系的证据。

STI值较高的SO7、SO28、LB5、LB25、TB1、MT3和BK12被确定为对照和盐胁迫条件下的高产品系，而MT3、BK12、MT17、BF10、SL8、SL16和SF32的值最高。 ST 的特点是暴露于盐度时产量损失小且敏感性低。

这些品系构成了具有理想适应特征的遗传资源，可用于栽培谷物的耐盐性育种计划。