The Regulation of Plant Secondary Metabolism in Response to Abiotic Stress: Interactions Between Heat Shock and Elevated CO2
The Regulation of Plant Secondary Metabolism in Response to Abiotic Stress: Interactions Between Heat Shock and Elevated CO2
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DOI：
10.3389/fpls.2019.01463
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发表时间：
2019-11-14
影响因子：
5.6
通讯作者：
Cameron, Duncan Drummond
中科院分区：
文献类型：
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作者：
Austen, Nichola;Walker, Heather J.;Cameron, Duncan Drummond
未来的气候变化将对全球植被的生理表现产生影响。温度和大气CO2浓度的增加将影响植物生长、净初级生产力、光合能力和其他对正常代谢功能至关重要的生化功能。除了植物生长发育的初级代谢功能外，生物和非生物胁迫对植物次生代谢的影响也将受到未来气候变化的影响。使用一个非目标的代谢指纹的方法，排放量测量，我们第一次调查如何升高大气中的CO2和温度都独立和交互影响植物次生代谢，通过资源分配，与由此产生的“权衡”之间的次生代谢过程中柳属。特别是异戊二烯生物合成。虽然以前有报道说，异戊二烯是抑制在升高的CO2的时候，异戊二烯的排放量增加，作为对短期热休克的反应，没有研究调查在代谢水平上的相互作用。我们已经证明，在代谢水平上，异戊二烯仍然在升高的CO2和温度期间产生，并且最终温度具有更大的影响。随着全球气温和大气CO2浓度因人类活动而上升，必须了解大气过程和全球植被之间的相互作用，特别是考虑到全球异戊二烯排放有可能有助于减缓大气变暖。
Future climate change is set to have an impact on the physiological performance of global vegetation. Increasing temperature and atmospheric CO2 concentration will affect plant growth, net primary productivity, photosynthetic capability, and other biochemical functions that are essential for normal metabolic function. Alongside the primary metabolic function effects of plant growth and development, the effect of stress on plant secondary metabolism from both biotic and abiotic sources will be impacted by changes in future climate. Using an untargeted metabolomic fingerprinting approach alongside emissions measurements, we investigate for the first time how elevated atmospheric CO2 and temperature both independently and interactively impact on plant secondary metabolism through resource allocation, with a resulting "trade-off" between secondary metabolic processes in Salix spp. and in particular, isoprene biosynthesis. Although it has been previously reported that isoprene is suppressed in times of elevated CO2, and that isoprene emissions increase as a response to short-term heat shock, no study has investigated the interactive effects at the metabolic level. We have demonstrated that at a metabolic level isoprene is still being produced during periods of both elevated CO2 and temperature, and that ultimately temperature has the greater effect. With global temperature and atmospheric CO2 concentrations rising as a result of anthropogenic activity, it is imperative to understand the interactions between atmospheric processes and global vegetation, especially given that global isoprene emissions have the potential to contribute to atmospheric warming mitigation.