不同水分胁迫下胡杨种子活力测定分析

Determination of Seed Vigor of Populus euphratica Oliv. under Different Water-Stress

摘要: 以塔里木河下游采集的成熟胡杨种子为材料，采用室内实验法分别对不同贮藏条件下胡杨种子活力和不同水分胁迫下的胡杨种子发芽率等进行了研究。结果表明，胡杨种子不耐贮藏，4℃密封贮藏能够有效延长种子寿命；不同浓度的PEG胁迫处理对种子的萌发均有一定的抑制作用，种子的发芽率、发芽势随胁迫强度的增加呈现明显下降趋势，26%的PEG胁迫处理时，胡杨种子的发芽率和发芽势相对保持在较高水平，可以将其作为评价种子活力状况的关键浓度。

Abstract: Using the ripe Populus euphratica Oliv. seed from the lower reaches of Tarim River as plant materials, seed vigor in two different storage conditions and under different water-stress was determined in laboratory conditions. The results showed that the seed of Populus euphratica Oliv. was not resistant to storage, and that aging of the seeds could be effectively extended in the storage of sealed under 4˚C. Seed germination had certain inhibitive effect in different concentrations of PEG. Seed germination rate and germination potential presented an obvious downward trend with the increase of the water-stress intensity. Because seed germination rate and germination potential remained relatively at a higher level under 26% PEG treat, so the 26% PEG could be as a critical concentration of seed vigor evaluation.