Photoprotective isoprenoids as physiological markers for the adaptation of Douglas fir to drought stress and climate change

光保护类异戊二烯作为花旗松适应干旱胁迫和气候变化的生理标记

• 批准号: 141948004
• 负责人: Professor Dr. Ingo Ensminger
• 金额: --
• 依托单位: Department of Biology
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/141948004?language=en
• 关键词: Photoprotective; isoprenoids; physiological; markers; adaptation

The aim of this study is to determine the diversity of isoprenoid-related mechanisms of drought tolerance in Douglas fir. Essential isoprenoids such as carotenoids, absicic acid and xanthophylls are present in all green organisms whereas nonessential isoprenoids are common in numerous but not in all plant species. The latter include volatile compounds such as isoprene, monoterpenes and sesquiterpenes. Besides other functions, non-essential isoprenoids are assumed to possess antioxidative properties, mediating protection against oxidative stress such as drought stress or stress by high temperatures. In this study we will analyse patterns and magnitude of volatile isoprenoid emissions by five Douglas fir provenances and elucidate the production of essential isoprenoids (being downstream of the biosynthetic pathway) in the same trees. By using provenances which have evolutionary adapted to contrasting environments, we will be able to relate isoprenoid emission patterns and formation of essential isoprenoids to provenance specific adaptive mechanisms of drought/high temperature tolerance. For this purpose we will use 50 year old trees in the field from large provenance-trials as well as seedlings derived through controlled selfing from the respective provenances in experiments simulating drought.

本研究旨在探讨道格拉斯冷杉类异戊二烯相关耐旱机制的多样性。必需类异戊二烯如类胡萝卜素、天冬氨酸和叶黄素存在于所有绿色生物中，而非必需类异戊二烯在许多但不是所有植物物种中常见。后者包括挥发性化合物如异戊二烯、单萜和倍半萜。除了其他功能外，非必需类异戊二烯被认为具有抗氧化特性，介导对氧化应激如干旱应激或高温应激的保护。在这项研究中，我们将分析模式和挥发性类异戊二烯排放量的五个道格拉斯冷杉种源和阐明生产的必需类异戊二烯（下游的生物合成途径）在同一棵树。通过使用种源，具有进化适应对比环境，我们将能够与异戊二烯排放模式和形成必要的异戊二烯种源特定的适应机制的干旱/高温耐受性。为此目的，我们将使用50岁的树木在现场从大型种源试验，以及通过控制自交来自各自的种源在模拟干旱的实验中的幼苗。