Leaf isoprene emission as a trait that mediates the growth-defense tradeoff in the face of climate stress
Leaf isoprene emission as a trait that mediates the growth-defense tradeoff in the face of climate stress
复制标题
DOI：
10.1007/s00442-020-04813-7
复制
发表时间：
2021-01-08
期刊：
影响因子：
2.7
通讯作者：
Sharkey, Thomas D.
中科院分区：
文献类型：
--
作者：
Monson, Russell K.;Weraduwage, Sarathi M.;Sharkey, Thomas D.
已知植物异戊二烯排放有助于非生物胁迫耐受性，特别是在高温和干旱期间，以及在细胞氧化胁迫期间。最近的研究表明，增加或去除异戊二烯排放的遗传转化会引起包括已知信号传导途径在内的细胞修饰级联，并相互作用以重塑适应性生长-防御权衡。异戊二烯信号传导最令人信服的证据是在莽草酸和苯丙酸途径中发现的，这些途径产生水杨酸、生物碱、单宁、花青素、黄酮醇和其他类黄酮;所有这些都在胁迫耐受性和植物防御中发挥作用。异戊二烯还影响萜类生物合成途径中的关键基因表达模式，以及茉莉酸、赤霉酸和细胞分裂素信号传导网络，这些信号传导网络在控制诱导型防御反应和影响植物生长和发育中具有重要作用，特别是在落叶后。在这篇综合论文中，利用过去对转基因白杨、烟草和拟南芥的研究，我们提出了异戊二烯作为一种代谢产物的证据，这种代谢产物协调细胞信号传导的各个方面，从而在气候胁迫期间增强化学防御，同时最大限度地降低生长成本。这一观点代表了我们思维的重大转变，从异戊二烯的直接影响，例如，通过改变膜特性或淬灭ROS，到间接影响，通过改变基因表达和蛋白质丰度。认识到异戊二烯在生长-防御权衡中的作用，为性状的进化、其对植物适应性和恢复力的贡献以及其最有效的生态位提供了新的视角。
Plant isoprene emissions are known to contribute to abiotic stress tolerance, especially during episodes of high temperature and drought, and during cellular oxidative stress. Recent studies have shown that genetic transformations to add or remove isoprene emissions cause a cascade of cellular modifications that include known signaling pathways, and interact to remodel adaptive growth-defense tradeoffs. The most compelling evidence for isoprene signaling is found in the shikimate and phenylpropanoid pathways, which produce salicylic acid, alkaloids, tannins, anthocyanins, flavonols and other flavonoids; all of which have roles in stress tolerance and plant defense. Isoprene also influences key gene expression patterns in the terpenoid biosynthetic pathways, and the jasmonic acid, gibberellic acid and cytokinin signaling networks that have important roles in controlling inducible defense responses and influencing plant growth and development, particularly following defoliation. In this synthesis paper, using past studies of transgenic poplar, tobacco and Arabidopsis, we present the evidence for isoprene acting as a metabolite that coordinates aspects of cellular signaling, resulting in enhanced chemical defense during periods of climate stress, while minimizing costs to growth. This perspective represents a major shift in our thinking away from direct effects of isoprene, for example, by changing membrane properties or quenching ROS, to indirect effects, through changes in gene expression and protein abundances. Recognition of isoprene's role in the growth-defense tradeoff provides new perspectives on evolution of the trait, its contribution to plant adaptation and resilience, and the ecological niches in which it is most effective.