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国际合作项目 |
| 中国西北荒漠分布的两种沙蒿种子修补的分子生态学机理 |
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负责人：黄振英，Daphne Osborne
来源: 中科院与英国皇家学会
实施时间: 2003.6-2006.6
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合作内容：
Artemisia species inhabit the harsh sandy deserts of Northwest China. How do their seeds germinate successfully where rainfall is rare and unpredictable and desiccation is extreme! We proposed that seed survival depends upon cellular repair occurring whenever enough water becomes available through high condensation of dew. Artemisia seeds are special in possessing thick polysaccharide coats that become mucilaginous when wetted, thereby prolonging the time seeds take to re-dry. We have just shown that dew alone can permit repair of DNA damage. We seek to investigate further how these desiccation-adapted seeds are able to maintain DNA repair at such low hydration. |
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