| 张静,崔颖,孙尧,颜梅,胡立勇.不同程度干旱胁迫对油菜种子萌发及幼苗生长特性的影响[J].干旱地区农业研究,2011,29(2):164~167 |
| 不同程度干旱胁迫对油菜种子萌发及幼苗生长特性的影响 |
| Effect of different degree of drought stress on germination and seedling growth of rapeseed(Brassica napus L.) |
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| DOI：10.7606/j.issn.1000-7601.2011.02.28 |
| 中文关键词: 油菜 干旱胁迫 种子萌发 幼苗生长 |
| 英文关键词:rapeseed(Brassica napus L.) drought stress germination seedling growth |
| 基金项目:国家科技支撑计划项目(2006BAD21B03,2009BADA8B01)；湖北省农业科技创新岗位项目 |
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| 中文摘要: |
| 采用不同渗透势聚乙二醇(PEG 6000)模拟干旱胁迫处理,观察油菜种子的萌发及生长状况。结果表明,干旱胁迫不同程度降低了油菜种子的萌发速率和出苗速率,-0.5~-1.0 MPa处理的最终发芽率随着渗透势的降低而显著降低,较对照降低了3.9%~86.9%,在-0.6~-1.0 MPa渗透势范围内不能成苗。试验7 d后将不同胁迫条件下未萌发的种子转入蒸馏水后均迅速萌发,第8天发芽率达到97.3%~98.3%,与对照差异不显著。干旱胁迫降低了种子活力,随着渗透势的降低,种子的平均发芽天数增长0.1~1.5 d,发芽指数降低了2.9%~96.45%,幼苗活力指数(-0.1~-0.5 MPa)降低了5.0%~23.8%。干旱胁迫同时降低茎长和根长,但茎长的降低幅度明显大于根长,根/茎比值表现较强的增加趋势。 |
| 英文摘要: |
| Under drought stress simulated by different concentrations of PEG 6000, the rate of germination and e-
mergence were both reduced in each osmotic potential, but the final gemination percentage was not affected . The gemi-nation percentage was reduced by 3.9%~86.9%0 compared to the control with the decrease of osmotic potential at -0.5~-1. 0 MPa, and there was no emergence at
-0.6~- 1.0 MPa. On the 7th day，ungeminated seeds of each treament were transferred to the distilled water，the gemination percentage reached 97. 3%~98.3%, and the difference was not significant compared to the control . Drought stress reduced seed vigor, mean germination time (MGT) increased by 0.1~1.5 d, germination index (GI) deceased by 2.9%~96.45%, and seedling vigor index(SVI) (during -0.1~-0.5 MPa) deceased by 5.0%~23.8%. Drought stress reduced shoot and root length， while the shoot lengh de-creased more than root length， root/ shoot ratio was highly increased with osmotic decreasing. |
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