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Abstract：
Isoprene and other plastidial isoprenoids are produced primarily from recently assimilated photosynthates via the 2-C-methyl-D-erythritol 4-phosphate (MEP) pathway. However, when environmental conditions limit photosynthesis, a fraction of carbon for MEP pathway can come from extrachloroplastic sources. The flow of extrachloroplastic carbon depends on the species and on leaf developmental and environmental conditions. The exchange of common phosphorylated intermediates between the MEP pathway and other metabolic pathways can occur via plastidic phosphate translocators. C1 and C2 carbon intermediates can contribute to chloroplastic metabolism, including photosynthesis and isoprenoid synthesis. Integration of these metabolic processes provide an example of metabolic flexibility, and results in the synthesis of primary metabolites for plant growth and secondary metabolites for plant defense, allowing effective use of environmental resources under multiple stresses.
摘要：
异戊二烯和其他质体类异戊二烯主要通过2-C-甲基-D-赤藓糖醇4-磷酸（MEP）途径从最近同化的光合产物中产生。然而,当环境条件限制光合作用时，用于MEP途径的碳的一部分可以来自于外氯塑料来源。氯外塑料碳的流动取决于物种以及叶片发育和环境条件。MEP途径和其他代谢途径之间常见的磷酸化中间体的交换可以通过质体磷酸盐易位物发生。C1和C2碳中间体可以促进叶绿体代谢，包括光合作用和类异戊二烯合成。这些代谢过程的整合提供了代谢灵活性的一个例子，并导致植物生长的初级代谢产物和植物防御的次级代谢产物的合成，允许在多重压力下有效利用环境资源。
