不同浓度盐胁迫对小麦萌发和幼苗生长的影响

提高以盐渍化为代表的中低产田的产量,已成为进一步提高小麦总产量的主要途径,对于保障中国粮食安全具有重要意义。笔者依据300 mmol/L盐浓度下的发芽率和水培苗期在200 mmol/L和400 mmol/L两个盐浓度梯度水平下的株高、根长、根数变化,对选自不同生态类型区的21份冬小麦资源及育成品种进行了耐盐性鉴定,并依据盐胁迫下的小麦发芽率和苗期植株变化对供试材料的耐盐力进行综合评判。研究结果表明:从供试材料中筛选出了1级耐盐材料3份;2级耐盐材料3份;3级耐盐材料5份,丰富了小麦耐盐种质资源。该方法与田间盐池鉴定方法相比,具有工作量小、速度快的优点,且鉴定结果与田间表现吻合度高,研究结果可为小麦耐盐育种提供理论和技术支撑,同时也可为进一步提高盐渍化土壤小麦产量提供技术支撑。

Effect of Salt Stress Concentration on Germination and Seedling Growth of Wheat

Increasing the yield of medium and low yield fields represented by salinization has become the main way to improve the production of wheat, which is of great significance for the food security in China. According to the germination rate under 300 mmol/L NaCl stress and the height, root length, root number under 200 mmol/L and 400 mmol/L salt stress, salt tolerance of 21 winter wheat germplasm and hydroponic seedlings selected from different ecological zones were identified, salt tolerance ability was evaluated according to germination rate and plant change in seedling stage of experimental material. The results showed that three first-grade salt-tolerant varieties, three second-grade salt-tolerant varieties and 5 third-grade salt-tolerant varieties were screened out, which enriched the salt tolerance germplasm resource of wheat. Compared with the method of salt pool, the method in this paper had the advantages of small workload and fast speed, and the results were consistent to field performance. The results could provide theoretical and technical support for wheat salt resistance breeding, and increasing wheat yield in saline soil.