不同香稻品种种子萌发和苗期对NaCl胁迫的响应

【目的】研究不同香稻品种的耐盐性,筛选出适应新疆盐渍化稻区的香稻耐盐品种。【方法】分析不同NaCl浓度(0、3、6、9和12 g/L)对20个香型水稻品种种子萌发和幼苗生长的影响。【结果】不同香稻品种的发芽势、发芽率、芽长、根长、根数、成活率及叶片成活率均随着NaCl浓度的增加呈下降的趋势;中、高盐浓度(9、12 g/L)显著抑制种子的萌发,降低种子的发芽势和发芽率,缩短芽长和根长,减少根数,致使盐害指数增加;同一盐浓度处理下,不同水稻材料的耐盐表现有差异。【结论】香型水稻品种的芽期和苗期的适宜筛选NaCl盐浓度可为6 g/L,超过其浓度对水稻的萌发及苗期生长均不利;粮香6-4香型品种的芽期和苗期的综合耐盐性好,97-4-3、粮香2-1、新策粳1号、新粳香1号、新粳香83号和新粳香8号的芽期耐盐性强,以上香稻品种可作为耐盐的香稻品种或资源进行利用。

Responses of Seeds of Different Fragrant Rice Varieties to NaCl Stress in Germination and Seedling Stages

【Objective】 To screen the salt tolerant varieties suitable for the salinized rice area in Xinjiang by exploring the salt tolerance of different fragrant rice cultivars.【Method】 The effects of different NaCl concentrations (0, 3, 6, 9 and 12 g/L) on seed germination and seedling growth of 20 aromatic rice varieties were studied.【Result】 The results showed that the germination potential, germination rate, shoot length, root length, root number, survival rate and leaf survival rate of different aroma rice varieties all decreased with the increase of NaCl concentrations. Medium salt concentration and high salt concentration (9 g/L, 12 g/L) significantly inhibited the seed germination, reduced the seed germination potential and its germination rate, shortened the length of shoots and roots, and decreased the root number, resulting in an increase in the salt damage index; The salt tolerance performance of different rice materials was different under the same salt concentration treatment.【Conclusion】 Through comprehensive analysis, it was concluded that the suitable NaCl salt concentration for screening at the bud stage and seedling stage of aroma-type rice varieties could be 6 g/L, exceeding the concentration would be detrimental to the germination and seedling growth of rice; The Liangxiang 6-4 fragrance variety has good comprehensive salt tolerance at the bud stage and seedling stage, 97-4-3, Liangxiang 2-1, Xincejing 1, Xinjingxiang 1, Xinjiangxiang 83 and Xinjiangxiang 8 have strong salt tolerance at the bud stage, and the above fragrant rice varieties can be used as salt-tolerant fragrant rice varieties or resources.