Nguyen Van Lam, Stangoulis James
College of Science and Engineering, Flinders University Bedford Park South Australia Australia.
Plant Environ Interact. 2024 Sep 11;5(5):e70008. doi: 10.1002/pei3.70008. eCollection 2024 Oct.
Wheat ( L.) is a mega-staple for millions of the world's populations and its yield potential is impacted by soil salinization. This study investigated genotypic variation in salt tolerance among six wheat genotypes, Gladius, Drysdale, GD0014, GD0120, GD0180, and GD0185. The study also characterized shoot traits, photosynthetic traits, leaf Na and K concentrations, and phloem sucrose. The plants were grown under controlled growth room conditions at 0 mM NaCl (Control) and 100 mM NaCl. The results showed that the salt tolerance index (STI, SFW: shoot fresh weight) varied from 0.52 for GD0120 to 0.69 for GD0180. Based on the STI, salt tolerance for the wheat genotypes was in the order, GD0180 > Gladius > GD0185 > Drysdale > GD0014 > GD0120. Projected shoot area (PSA) at all growth stages, 14, 20, 27, 34, and 40 DAS were strongly correlated with SFW at 45 DAS. Salt treatment significantly increased phloem sucrose level in the salt intolerant, Drysdale, while having no effect on this parameter in Gladius. Gladius showed greater maintenance of stomatal conductance than Drysdale. The relative ratio of K/Na between treatment and control was strongly correlated with the relative ratio of SFW ( = .85). The correlation between PSA at 14 DAS and SFW at 45 DAS and the correlation between the relative ratio of K/Na between treatment and control with STI identify these parameters to be potential traits for screening salt tolerance in wheat. Higher salt tolerance in Gladius would be associated with higher maintenance of stomatal conductance and enhanced phloem sucrose transport.
小麦（L.）是全球数百万人的主要主食，其产量潜力受到土壤盐渍化的影响。本研究调查了六个小麦基因型（Gladius、Drysdale、GD0014、GD0120、GD0180和GD0185）在耐盐性方面的基因型变异。该研究还对地上部性状、光合性状、叶片钠和钾浓度以及韧皮部蔗糖进行了表征。植株在可控生长室条件下于0 mM NaCl（对照）和100 mM NaCl环境中生长。结果表明，耐盐指数（STI，SFW：地上部鲜重）在GD0120为0.52至GD0180为0.69之间变化。基于STI，小麦基因型的耐盐性顺序为：GD0180 > Gladius > GD0185 > Drysdale > GD0014 > GD0120。在所有生长阶段（14、20、27、34和40日龄）的预测地上部面积（PSA）与45日龄时的SFW密切相关。盐处理显著提高了不耐盐的Drysdale中的韧皮部蔗糖水平，而对Gladius中的该参数没有影响。Gladius比Drysdale表现出更好的气孔导度维持能力。处理组与对照组之间的K/Na相对比值与SFW相对比值密切相关（r = 0.85）。14日龄时的PSA与45日龄时的SFW之间的相关性以及处理组与对照组之间的K/Na相对比值与STI之间的相关性表明，这些参数是筛选小麦耐盐性的潜在性状。Gladius较高的耐盐性可能与其较高的气孔导度维持能力和增强的韧皮部蔗糖运输有关。
