16个荞麦品种幼苗的耐盐性筛选与评价

为明确荞麦品种间在不同种类盐胁迫下耐盐性的差异，以16个荞麦品种为材料，设置了NaCl、Na₂SO₄和NaHCO₃ 3种单盐处理，研究了其对荞麦发芽率、发芽势、相对伤害率等的影响，最后对荞麦的耐盐性进行综合性评价。结果表明：荞麦对3种盐胁迫的响应存在明显差异，以NaHCO₃处理时16个荞麦品种的发芽率、发芽势、相对发芽势和相对发芽指数均相对较低，对荞麦种子萌发抑制作用最明显；NaCl对荞麦种子萌发的抑制作用最小，其中荞杂1号、平荞2号和川荞1号的萌发率和对照处理一致。荞麦种类间以甜荞的耐盐性高于苦荞。耐盐性综合性评价筛选出耐盐性较强的苦荞品种为九江苦荞和云荞1号，甜荞品种为宁荞1号和贵红甜1号。

Screening and evaluation of salt stress in 16 seedlings of buckwheat varieties

In order to clarify the difference of salt tolerance among buckwheat varieties under different kinds of salt stress, in this experiment, 16 buckwheat varieties were used as the materials, three single-salt treatments, such as NaCl, Na₂SO₄ and NaHCO₃, were set up to study the effects of the germination rate, germination potential, relative damage rate, etc., and the salt tolerance of buckwheat was evaluated comprehensively. The results showed that there were significant differences in the response of buckwheat to the three kinds of salt stress. The germination rate, germination potential, relative germination potential and relative germination indexes of 16 buckwheat varieties treated with NaHCO₃ were relatively low, and the inhibition effect on germination of buckwheat seeds was the most obvious; the germination of buckwheat seeds was the least inhibited by NaCl, and the germination rates of buckwheat seeds of Zaqiao1, Pingqiao 2 and Chuanqiao 1 were the same as those of the control. The salt tolerance of buckwheat was higher in common buckwheat than Tartary buckwheat. By comprehensive evaluation of salt tolerance, Jiujiang Tartary buckwheat and Yunqiao 1 buckwheat were selected as the buckwheat varieties with strong salt tolerance, while Ningqiao 1 and Guihongtian 1 were selected as the common buckwheat varieties. These buckwheat varieties could be popularized in saline-alkali areas.