Abstract: 【Objective】 To screen the suitable PEG-6000 concentration to evaluate the drought resistance of flax, and explore the causes of drought resistance in flax seeds.【Method】 Different PEG-6000 concentrations (0, 5%, 10%, 15%, 20%, 25% and 30%) were used to simulate the drought stress on germination stage in 15 flax seeds and seven indicators including germination energy, germination rate were measured. Membership function method was used to comprehensively analyze the correlation among the water absorption rate, thousand-grain weight and drought resistance of flax seeds.【Result】 Under 5% PEG-6000 stress, except Atalante, the germination rate of the remaining cultivars was higher than that of CK. All of the variation coefficients of 20% PEG-6000 concentration were the highest among the three indicators of germination rate, bud length and total length. Under different treatments, the water absorption rate of flax seeds in 48 hours was obviously negatively correlated with the drought resistance of flax.【Conclusion】 Low PEG-6000 concentration can promote the germination of flax seeds. 20% PEG-6000 concentration is the optimum concentration of flax drought resistance to evaluate the difference of varieties in flax. The water absorption rate of seeds is one of the factors affecting the drought resistance of flax.

Key words: flax; PEG-6000; drought; optimum concentration; seeds water absorption rate

摘要： 【目的】 筛选出能够评价亚麻品种抗旱性的适宜PEG-6000浓度,研究造成亚麻种子抗旱差异的原因,为亚麻旱地栽培及抗旱育种提供基础。【方法】 采用不同的PEG-6000浓度(0、5%、10%、15%、20%、25%、30%)模拟干旱对15种亚麻种子进行胁迫,记录发芽势、发芽率等七个指标,通过隶属函数各指标进行综合评价,分析亚麻种子吸水率、千粒重与抗旱性相关性。【结果】 5% PEG-6000胁迫下,除Atalante外,其余品种发芽率均高于对照;在发芽率、芽长和全长这三个指标中,20% PEG-6000浓度胁迫下,各品种数据的变异系数最大;不同处理下,48 h内的种子吸水率均与亚麻抗旱性呈负相关关系。【结论】 浓度PEG-6000溶液对亚麻种子的萌发有促进作用;20% PEG-6000浓度为评价亚麻抗旱性的最适浓度;种子吸水率为影响亚麻抗旱性的因素之一。

关键词: 亚麻, PEG-6000, 干旱, 最适浓度, 种子吸水率