| 摘要: |
| 本试验以3种结球生态型，6个大白菜品种为材料，研究其秋冬期间田间抗寒性的差异。结果表明，随田间气温的降低，3种结球生态型大白菜叶片渗透势均先降低后升高；电解质渗漏率呈递增趋势；叶片含水量下降，自由水与束缚水质量比变小，至2001年1月14日自由水与束缚水质量比接近1；叶绿素含量和叶绿素a与b质量比呈降低趋势。但在低温胁迫下直筒型品种的电解质渗漏率较平头型和卵圆型低。叶片含水率和自由水与束缚水质量比较低，而叶绿素含量较高，耐寒性较好。 |
| 关键词: 大白菜 生态型 抗寒性 渗透势 自由水与束缚水质量比 |
| DOI：10.11841/j.issn.1007-4333.2004.04.096 |
| 修订日期：2004-03-31 |
| 基金项目: |
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| Primary evaluation of freezing-tolerance of Chinese cabbage with different ecotypes |
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| Abstract: |
| Six varieties of Chinese cabbage with different ecotypes were used in this experiment to investigate their freezing tolerance. The results showed that the water content and the ratio of free to binded water in leaf decreased, but electrolytic leakage increased slowly with temperature decrease. Osmosis potential firstly decreased,and then increased with decreasing temperature. The free water content was nearly equal to the binded water content in January 14. The chlorophyll content and the ratio of chlorophyll a/b also decreased slowly.However, under low temperature stress, electrolytic leakage, leaf water content and the ratio of free to binded water of ecotp. cylindrica were all lower than those of ecotp. ocata and ecotp. depressa . It was obvious that ecotp. cylindrica had stronger ability against freezing. |
| Key words: Chinese cabbage,ecotype,freezing-tolerance,osmosis potential,the ratio of free to binded water |
