Dynamic Acclimation of Photosynthesis Increases Plant Fitness in Changing Environments
Dynamic Acclimation of Photosynthesis Increases Plant Fitness in Changing Environments
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DOI：
10.1104/pp.109.149351
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发表时间：
2010-01-01
期刊：
影响因子：
7.4
通讯作者：
Johnson, Giles N.
中科院分区：
文献类型：
--
作者：
Athanasiou, Kleovoulos;Dyson, Beth C.;Johnson, Giles N.
生长在不同环境中的植物具有不同的光合作用能力-光合作用的发育适应。完全发育的叶片也有可能改变其光合作用能力--动态适应。适应的重要性以前从未被证明过。在这里，我们表明，发育和动态适应是不同的过程。此外，我们还证明了动态驯化在提高植物在自然环境中的适合度方面发挥了重要作用。拟南芥植株在弱光下生长，然后转移到强光下长达9d，这导致光合作用能力增加约40%。微阵列分析表明，在强光下，编码葡萄糖-6-磷酸/磷酸转运体GPT2的基因At1g61800的表达显著但短暂地增加。这种基因被破坏的植物无法进行动态驯化。然而，他们仍然能够适应发展。当在受控条件下生长时，无论GPT2的表达如何，以种子产量和发芽率衡量的适合度是相同的。然而，在自然变化的条件下，缺乏适应能力的植物的适合度大大降低。与野生型相比，gpt2转基因植物的种子产量减少了一半，种子萌发的产量大大减少。因此，光合作用的动态驯化在决定植物在变化的环境中生长的适合性方面发挥着关键的、以前未被认识到的作用。
Plants growing in different environments develop with different photosynthetic capacities-developmental acclimation of photosynthesis. It is also possible for fully developed leaves to change their photosynthetic capacity-dynamic acclimation. The importance of acclimation has not previously been demonstrated. Here, we show that developmental and dynamic acclimation are distinct processes. Furthermore, we demonstrate that dynamic acclimation plays an important role in increasing the fitness of plants in natural environments. Plants of Arabidopsis (Arabidopsis thaliana) were grown at low light and then transferred to high light for up to 9 d. This resulted in an increase in photosynthetic capacity of approximately 40%. A microarray analysis showed that transfer to high light resulted in a substantial but transient increase in expression of a gene, At1g61800, encoding a glucose-6-phosphate/phosphate translocator GPT2. Plants where this gene was disrupted were unable to undergo dynamic acclimation. They were, however, still able to acclimate developmentally. When grown under controlled conditions, fitness, measured as seed output and germination, was identical, regardless of GPT2 expression. Under naturally variable conditions, however, fitness was substantially reduced in plants lacking the ability to acclimate. Seed production was halved in gpt2- plants, relative to wild type, and germination of the seed produced substantially less. Dynamic acclimation of photosynthesis is thus shown to play a crucial and previously unrecognized role in determining the fitness of plants growing in changing environments.