Abstract Quinoa is a nutritious seed crop with a great potential to grow in saline soils. Here, we studied ion concentrations in quinoa tissues throughout the life cycle of the plant, and linked ion dynamics to responses in growth parameters, seed yield and efficiency of photosynthesis under salinity (0–400 mM NaCl). Ion dynamics changed from high ion exclusion (>99 %, root contents lower than root medium and low accumulation of ions in the leaves) before flowering, to a build-up of ions during seed filling. This indicates a change in strategy in maintaining the necessary gradient of water potential from the root medium to the leaves. K+ concentrations in leaves also increased by more than 100 % in response to prolonged severe salt stress, which may point to a role of this ion in leaf osmotic adjustment. Accumulation of ions in epidermal bladder cells did not contribute substantially to Na+-exclusion as it was less than 6 % of the total Na+ taken up in leaves. Growth under salt stress was mostly impaired by anatomical adaptations (reduced SLA), while initial light use efficiency (Fv/Fm) and NAR were not affected. The variety Pasto showed a “survival strategy” to high salinity with higher ion exclusion and a higher reduction in transpiration than the other varieties, at the expense of lower biomass and seed yield.

中文翻译：

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欧洲藜麦品种的离子动力学、生长和种子产量对盐胁迫的差异响应

摘要 藜麦是一种营养丰富的种子作物，在盐碱地生长潜力巨大。在这里，我们研究了整个植物生命周期中藜麦组织中的离子浓度，并将离子动力学与生长参数、种子产量和盐度（0-400 mM NaCl）下光合作用效率的响应联系起来。离子动力学从开花前的高离子排斥（> 99 %，根含量低于根中等且离子在叶子中的积累量低）转变为种子灌浆过程中的离子积累。这表明在维持从根介质到叶子的必要水势梯度方面的策略发生了变化。由于长期严重的盐胁迫，叶片中的 K+ 浓度也增加了 100% 以上，这可能表明该离子在叶片渗透调节中起作用。表皮膀胱细胞中离子的积累对 Na+ 排除没有实质性贡献，因为它不到叶子中吸收的总 Na+ 的 6%。盐胁迫下的生长主要受到解剖适应（降低的 SLA）的影响，而初始光利用效率 (Fv/Fm) 和 NAR 不受影响。与其他品种相比，Pasto 品种对高盐度显示出一种“生存策略”，具有更高的离子排斥和蒸腾作用的减少，但代价是生物量和种子产量较低。