| 摘要: |
| 选用耐低温性不同的 4个黄瓜品种 ,研究了黄瓜发芽期耐低温性鉴定的方法与指标。在室温 ( 2 5± 0 .5)℃及低温 ( 1 5± 0 .5)℃条件下 ,发芽高峰后各品种超弱发光值与其耐低温性强弱相一致 ;低温条件下胚根相对伸长率可反映品种间的耐低温性差异 ;浸种后36～ 48h为耐低温性鉴定的适期 ;浸种 36h的种芽经 ( 2 .5± 0 .5)℃处理 2 4 h,恢复期的胚根伸长率可以区别品种间的低温耐受性 ;用种子活力综合指标、超弱发光指标及胚根伸长指标构建的黄瓜芽期低温鉴定指标体系可以全面、准确地反映黄瓜的低温耐受性。 |
| 关键词: 黄瓜,发芽期,耐冷性,鉴定指标 |
| DOI： |
| 分类号:S642.2 |
| 基金项目:国家“九五”科技攻关项目(96-002-02) |
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| Appraisal methods and indexes for low-temperature tolerance in cucumber (Cucumis sativus L.) at seed germination stage |
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YuShuancang CciHongwen MengHuanwen
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| Abstract: |
| Four varieties were used to study the appraisal methods and indexes at seed germ ination stage for cucumber low-temperature tolerance.The results showed that the Ultra-Weak Luminescence (UWL) value both at low temperature(15±0. 5)℃ and at room temperature (25±0. 5)℃ after the germinating peak corresponded well with their ability of low-temperature tolerance. The relative elongation rate of radicle under low-temperature could show the difference in low-temperature tolerance among varieties.The optional identification stagewas during 36-48 h after seed soaking.The application of 36 h germinating seeds suggested that the relative elongation rate of radicle during resuming period after 24 h (2. 5±1)℃ treatment well reflected the variety′s ability of low-temperature tolerance.Seed vigor comprehensive index,UWL and radicle elongation index in the test constituted an appraisal system that could explore cucumber low-temperature tolerance correctly. |
| Key words: cucumber,germination stage,low-temperate tolerance,appraisal index |
