Dissertation Research: Multiple Carbon Sources for Isoprene Pproduction

标题：异戊二烯生产的多种碳源研究人员：Manuel T. Lerdau和Jennifer L. fun异戊二烯（2-甲基1,3-丁二烯）是从许多温带和热带森林排放的最丰富的挥发性有机化合物。异戊二烯在植物体内的产生对植物代谢和低层大气化学都具有重要意义。预测单个植物、森林冠层和较大区域的异戊二烯排放模式涉及综合在短期和长期尺度上起作用的调节因素。虽然异戊二烯的产生在极短的时间尺度上受光和温度变化的调控，但我们对生理和环境因素在更大的时间和空间尺度上调控异戊二烯排放的机制的了解有限。据信，异戊二烯生产中使用的碳主要来自最近通过光合作用同化的前体。然而，有人提出，当低光合速率限制了最近同化前体的供应时，储存的碳（碳水化合物）可以促进异戊二烯的产生。本研究将检验储存碳在异戊二烯生产中的重要性。这将通过(1)探索储存碳在异戊二烯生产中的作用及其在特定环境条件下的重要性，以及(2)基于这些发现评估现有的叶片水平模型来实现。了解储存的碳在异戊二烯生产中的作用将有助于阐明异戊二烯生产的基本环境生理学，并改进向大气排放的模型。

Title: Multiple Carbon Sources for Isoprene ProductionInvestigators: Manuel T. Lerdau and Jennifer L. FunkIsoprene (2-methyl 1,3-butadiene) is the most abundant volatile organic compound emitted from many temperate and tropical forests. The production of isoprene in plants has important implications for both plant metabolism and the chemistry of the lower atmosphere. Predicting patterns of isoprene emission from individual plants, forest canopies and larger regions involves the integration of regulatory factors operating on both short- and long-time scales. While the regulation of isoprene production on very short-time scales is dominated by changes in light and temperature, our knowledge of the mechanisms by which physiological and environmental factors regulate isoprene emission over larger temporal and spatial scales is limited. It is believed that the carbon used in isoprene production is derived primarily from recently assimilated precursors via photosynthesis. However, it has been proposed that stored carbon (carbohydrate) can contribute to isoprene production when low photosynthetic rates limit the supply of recently assimilated precursors. This research will examine the importance of stored carbon in isoprene production. This will be accomplished by (1) exploring the role of stored carbon in isoprene production and its importance under specific environmental conditions and (2) evaluating existing leaf-level models based on these findings. Understanding the role of stored carbon in isoprene production will help to elucidate the fundamental environmental physiology of isoprene production and improve efforts to model emission to the atmosphere.