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以-0.5 MPa的PEG6000作渗透介质模拟干旱条件,对不同生态区的谷子(Setaria italica(L.)Beauv.)品种(系)进行种子萌发耐旱鉴定。结果表明:在PEG6000胁迫下,萌发耐旱指数与相对根芽比、芽生长抑制率呈极显著负相关;与根生长抑制率呈正相关,但相关系数小,相关不显著;与相对发芽势呈极显著正相关,且相关系数达0.939,可以反映谷子芽期耐旱性。根据萌发耐旱指数,将201份谷子品种(系)划分为极抗旱、抗旱、中度抗旱、不抗旱和极不抗旱5个等级。
The PEG6000 with -0.5 MPa as the osmotic medium was used to simulate the drought conditions, and the germination and drought tolerance of the germplasm (germplasm) of Setaria italica (L.) Beauv. In different ecoregions were evaluated. The results showed that under the drought stress of PEG6000, the germination drought index was significantly negatively correlated with the relative root shoot ratio and bud growth inhibition rate, but positively correlated with the root growth inhibition rate, but the correlation coefficient was small but the correlation was not significant. Very significant positive correlation, and the correlation coefficient of 0.939, can reflect the drought-resistant millet bud stage. According to germination drought tolerance index, 201 grain millet varieties (lines) were divided into 5 levels, that is, extremely drought resistance, drought resistance, moderate drought resistance, no drought resistance and very no drought resistance.