干旱是一种最严重的非生物胁迫因子，极大地限制了植物生产力。随着我国干旱频率和强度及受旱区域不断增加，这势必会给干旱敏感的箭竹自然更新造成严重影响，使大熊猫将面临缺食危机。然而，有关箭竹抗旱及调控的机制鲜见报道。此外，根系及其呼吸代谢极易受土壤环境变化影响，在植物适应环境变化中发挥着核心作用，但这在木本植物上很少受关注。为此，本项目以缺苞箭竹和青川箭竹根系为研究对象，利用RT-PCR等技术方法，在组织及亚细胞水平上研究干旱和施磷下箭竹根系呼吸代谢（各代谢途径、呼吸底物、主要代谢产物、关键酶等）及其过程中线粒体内活性氧防御途径（交替呼吸途径中各种耗能组分、抗氧化防御系统、泛醌库氧化还原态等）以及线粒体结构和功能（数目、超微结构、P/O等）变化，以明确箭竹根系呼吸代谢及其过程中线粒体内活性氧防御途径对干旱响应和磷素调控的生理与分子机制，为退化的大熊猫栖息地植被恢复和管理提供理论依据。

Drought is the most severe abiotic stress factor limiting plant production. Drought frequency and intensity as well as drought-hit regions are increasing in China, as inevitably has a serious impact on natural regeneration of the drought-sensitive Fargesia, resulting in the food shortage crisis of panda. However, the response of Fargesia to drought is lack of study. Furthermore, Plant root and its respiratory metabolism are affected vulnerably by soil environmental changes and play a central role in the process of plant adaptation to environmental change, whereas, little attention is given to them in woody plants. Hence, in our study, we investigated the changes of respiratory metabolism (metabolic pathways, respiratory substrates, the main metabolites, the key enzymes, etc.), mitochondrial ROS defense pathways (various energy-dissipating alternative respiratory components, antioxidant defense system, ubiquinone redox states, etc.) as well as mitochondrial structure and function (number, ultrastructure, P/O, etc.) in Fargesia root to drought and phosphorus application, which would reveal the physiological and molecular mechanism of the response of respiratory metabolism and mitochondrial ROS defense pathways in Fargesia root to drought and phosphorus regulation. These results would provide theoretical basis and practical guideline for the vegetation restoration and management of degraded panda habitat.