PEG模拟干旱胁迫对不同黄瓜品种种子萌发的影响

以中农16号、津园6号、蔬春宝优26号黄瓜品种的种子为材料,采用不同浓度PEG6000(渗透势)模拟干旱胁迫,研究干旱胁迫对种子发芽率、发芽指数、活力指数、胚根长、下胚轴长、幼胚一级侧根数、电解质外渗率、胚根干质量的影响。结果表明,低渗透势对3个黄瓜品种的发芽率、发芽指数、活力指数、胚根长、下胚轴长、幼胚一级侧根数、胚根干质量有明显促进作用,高渗透势对上述指标有明显抑制作用,但电解质外渗率随渗透势的增加而降低。不同黄瓜品种抗旱性强弱依次为中农16号津园6号蔬春宝优26号。

Effects of PEG Simulated Drought Stress on Seed Germination of Different Cucumber Varieties

Taking the seeds of cucumber（Cucumis sativus L.）varieties‘Zhongnong No.16’, ‘Jinyuan No.6’and‘Shuchunbaoyou No.26’as experimental materials, by using different concentration PEG6000 to simulate drought stress conditions, we studied the effects of drought stress on seed germination rate, germination index, vigor index, radicle length, hypocotyl length, lateral root number, electrolyte leakage rate, the dry weight of radicle. The results showed that the low osmotic potential treatment had significant promotion effect on germination rate, germination index, vigor index, radicle length, hypocotyl length, lateral root number and the dry weight of radicle. While the high osmotic potential treatment had obvious inhibition role on the germination rate, germination index, vigor index, radicle length, hypocotyl length, lateral root number and the dry weight of radicle, However, the electrolyte leakage rate is reduced with the increase of osmotic potential treatment. The drought resistance sequence of different cucumber species is‘Zhongnong No.16’>‘Jinyuan No.6’>‘Shuchunbaoyou No.26’.