6 winter wheat varieties (or lines) were used as materials, their coleoptile l ength, seedling length and main radicle length of wheat seedlings were investig ated under different concentrations of PEG-6000 osmotic solution simulated drou ght stress, and their relations with the yield components and drought tolerance under rainfed and rainout shelters were further analyzed. Under different conce ntrations PEG-6000 osmotic solution simulated drought stress, significant diffe r ences were observed among different wheat varieties. The correlation analysis on their coleoptile length in seedlings under different treatments with their yiel d drought tolerance index revealed significant and positive association with cor relation coefficient of 0.9600. The longer the coleoptile length of the variety is , the higher the drought tolerance index is. Coleoptile length were observed in different varieties,and the differences among varieties were consistent under different simulated drought stresses, therefore, coleoptile length could be us ed in the evaluation of drought in wheat at the early stage.%以6个抗旱性不同的冬小麦品种(系)为材料,通过不同浓度的PEG-6000渗透溶液模拟干旱胁迫处理,研究了小麦苗期的胚芽鞘长度、苗高、主胚根长等性状,并与其在大田及防雨棚控水条件下的产量构成和抗旱性的关系进行分析.结果表明,在不同浓度的PEG-600 0渗透溶液干旱胁迫处理下,小麦苗期胚芽鞘长度在品种间差异显著;产量的抗旱指数与苗期不同干旱胁迫处理下的胚芽鞘长度的相关性分析表明,小麦的胚芽鞘长度与其抗旱指数呈极显著正相关(相关系数为0.9600),抗旱性强的品种胚芽鞘较长,抗旱性弱的品种胚芽鞘较短.在不同程度的干旱胁迫处理下,各品种的胚芽鞘长度变化趋势大致相同 ,因此利用胚芽鞘长度可以在早期对小麦的抗旱性进行鉴选.
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