以彩棉品种棕色棉BC05、陇绿棉3号为材料，采用不同浓度的PEG-6000处理，研究了彩棉种子萌发期对干旱胁迫的响应。结果表明，随着PEG-6000浓度的增加，BC05和陇绿棉3号子叶鲜重、子叶干重、胚根干重、下胚轴长、胚根长等指标均呈下降趋势。在PEG-6000胁迫浓度为25%时，BC05种子萌发被完全抑制，而陇绿棉3号在PEG-6000胁迫浓度为30%时种子萌发才被抑制。不同彩棉种子各指标降低的幅度存在差异。

In order to explore the growth of cotton seeds under water stress， the seeds of two colored cotton varieties BC05 and Longlümian 3 were treated with different concentrations of PEG-6000 to study the response of colored cotton seeds to drought stress during germination. The results showed that with the increase of PEG-6000 concentration， the cotyledon fresh weight， cotyledon dry weight， radicle dry weight， hypocotyl length and radicle length of BC05 and Longlümian 3 decreased. When the concentration of PEG-6000 stress was more than 25%， the seed germination of BC05 was completely inhibited， While that of Longlumian 3 was inhibited when the PEG-6000 stress was 30%. Therefore， there are differences in the decrease of each index of different colored cotton seeds.

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甘肃省农业科学院中青年基金项目(2019GAAS43)。