| 摘要: |
| 杜鹃花为世界三大高山花卉和中国十大传统名花之一, 具有极高的观赏价值和广阔的园林应用前景。但是,杜鹃花大多自然分布于高海拔山地, 受遗传机制制约, 性喜冷凉湿润气候, 干旱是制约其迁地保育和园林应用的关键因子。杜鹃花种类繁多、分布地域较广、生态类型多样, 不同物种(品种)对干旱胁迫的响应机制存在差异。该文从种子发芽、形态与解剖特征、生理与生化指标、基因表达等方面综述了杜鹃花对干旱胁迫的响应机制以及外源物质提高杜鹃花抗旱性的国内外研究进展, 分析了当前该研究领域存在的不足, 提出了今后工作中应加强不同生态类型及不同抗旱性杜鹃的水分利用策略和抗旱机制, 以及菌根真菌提高杜鹃花抗旱性的基因调控机制与优良菌株筛选等研究,为我国杜鹃花多样性保育、抗旱性资源发掘及园林应用等提供参考依据。 |
| 关键词: 杜鹃花, 干旱胁迫, 响应机制, 外源物质, 抗旱性 |
| DOI：10.11931/guihaia.gxzw202004006 |
| 分类号:Q945.78 |
| 文章编号:1000-3142(2022)04-0700-14 |
| 基金项目:国家国际科技合作项目(2014DFA31720); 国家科技基础性工作专项(2015 FY210100-7); 中国科学院科技服务网络计划(STS计划)区域重点项目(KFJ-STS-QYZD-178)[Supported by the International S & T Cooperation Project of China(2014DFA31720); Ministry of Science and Technology of China(2015 FY210100-7); Regional Key Projects of the Science and Technology Service Network Initiative(STS plan)of the Chinese Academy of Sciences(KFJ-STS-QYZD-178)]。 |
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| Research progress of drought stress on Rhododendron |
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LI Dandan1,2, LI Xiaohua1,2, ZHANG Lehua1,2*
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1. Lushan Botanical Garden, Jiangxi Province and Chinese Academy of Sciences, Lushan 332900, Jiangxi, China;2. Provincial
Key Laboratory of Plant Ex Situ Conservation and Utilization, Jiujiang 332015, Jiangxi, China
1. Lushan Botanical Garden, Jiangxi Province and Chinese Academy of Sciences, Lushan 332900, Jiangxi, China; 2. Provincial
Key Laboratory of Plant Ex Situ Conservation and Utilization, Jiujiang 332015, Jiangxi, China
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| Abstract: |
| As one of the three alpine flowers in the world and one of the ten traditional famous flowers in China, Rhododendron has high ornamental value and broad landscape applications. However, most of them are naturally distributed in high-altitude mountains, and they prefer cool and humid climate for the restriction of genetic mechanism. Drought is the key factor to restrict their ex-situ conservation and landscape application. As Rhododendron have many different species, cultivars and ecological types, distributed in a wide area, the mechanisms of different species or cultivars responses to drought stress are different. In this paper, how Rhododendron responses to drought stress and the effects of exogenous substances on improving the drought resistance of Rhododendron in China and abroad were reviewed from the aspects of seed germination, morphological and anatomical characteristics, physiological and biochemical parameters, gene expression, etc. In addition, the deficiency of current research and the future research directions were also discussed. It is proposed that the water use strategy and drought resistance mechanism of different ecological types and different drought resistances of Rhododendron should be future studied, as well as the gene regulation mechanism of mycorrhizal fungi for improving the drought resistance and the screening of excellent strains. This study provides the basis for the diversity conservation, the exploitation of drought resistance resources and the landscape applications of Rhododendron in China. |
| Key words: Rhododendron, drought stress, response mechanism, exogenous substances, drought resistance |
