Temperature response of photosynthesis in C3, C4, and CAM plants: temperature acclimation and temperature adaptation
Temperature response of photosynthesis in C3, C4, and CAM plants: temperature acclimation and temperature adaptation
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DOI：
10.1007/s11120-013-9874-6
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发表时间：
2013-06
影响因子：
3.7
通讯作者：
W. Yamori;K. Hikosaka;D. Way
中科院分区：
文献类型：
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作者：
W. Yamori;K. Hikosaka;D. Way
大多数植物显示出相当大的能力，以调整其光合特性，以适应其生长温度（温度驯化）。最典型的情况是光合作用的最佳温度的变化，这可以在生长温度下使光合速率最大化。这些塑料调节可以使植物在新的生长温度下更有效地进行光合作用。在这篇综述文章中，我们总结了C3，C4和CAM植物光合反应的基本差异。本文综述了C3、C4和CAM光合作用对温度响应的研究进展，并讨论了各光合类型光合作用温度适应的生理生化机制。最后，我们使用已发表的数据来评估高等植物光合温度驯化的程度，并分析哪些植物类群（即，光合类型和功能类型）具有比其它类型更大的光合适应温度的内在能力，因为已经报道了这种能力的种间差异。结果表明，C3、C4和CAM植物的光合作用对温度的适应能力不同，C3植物的功能类型也不同。C3植物在较宽的温度范围内具有较强的光合温度适应能力，CAM植物昼夜光合过程对温度的适应能力不同，C4植物对温暖环境的适应能力较强。此外，在C3物种中，万年青木本植物和多年生草本植物表现出更大的光合作用温度稳态（即，高生长温度下的光合速率除以低生长温度下的光合速率接近于1.0），这表明光合适应对于多年生、长寿物种尤其重要，这些物种在其生命周期中会经历生长季节温度的上升。有趣的是，在整个生长温度下，光合作用的温度动态平衡的程度被维持，而不管光合作用的最佳温度（Topt）的变化程度如何，这表明一些植物在生长温度下通过改变Topt来实现更大的光合作用，而另一些植物也可以通过改变光合作用-温度曲线的形状而不改变Topt来实现更大的光合作用。认为光合作用温度驯化内在稳定性的差异，反映在光合速率限制步骤的差异上。
Most plants show considerable capacity to adjust their photosynthetic characteristics to their growth temperatures (temperature acclimation). The most typical case is a shift in the optimum temperature for photosynthesis, which can maximize the photosynthetic rate at the growth temperature. These plastic adjustments can allow plants to photosynthesize more efficiently at their new growth temperatures. In this review article, we summarize the basic differences in photosynthetic reactions in C3, C4, and CAM plants. We review the current understanding of the temperature responses of C3, C4, and CAM photosynthesis, and then discuss the underlying physiological and biochemical mechanisms for temperature acclimation of photosynthesis in each photosynthetic type. Finally, we use the published data to evaluate the extent of photosynthetic temperature acclimation in higher plants, and analyze which plant groups (i.e., photosynthetic types and functional types) have a greater inherent ability for photosynthetic acclimation to temperature than others, since there have been reported interspecific variations in this ability. We found that the inherent ability for temperature acclimation of photosynthesis was different: (1) among C3, C4, and CAM species; and (2) among functional types within C3plants. C3plants generally had a greater ability for temperature acclimation of photosynthesis across a broad temperature range, CAM plants acclimated day and night photosynthetic process differentially to temperature, and C4plants was adapted to warm environments. Moreover, within C3species, evergreen woody plants and perennial herbaceous plants showed greater temperature homeostasis of photosynthesis (i.e., the photosynthetic rate at high-growth temperature divided by that at low-growth temperature was close to 1.0) than deciduous woody plants and annual herbaceous plants, indicating that photosynthetic acclimation would be particularly important in perennial, long-lived species that would experience a rise in growing season temperatures over their lifespan. Interestingly, across growth temperatures, the extent of temperature homeostasis of photosynthesis was maintained irrespective of the extent of the change in the optimum temperature for photosynthesis (Topt), indicating that some plants achieve greater photosynthesis at the growth temperature by shiftingTopt, whereas others can also achieve greater photosynthesis at the growth temperature by changing the shape of the photosynthesis–temperature curve without shiftingTopt. It is considered that these differences in the inherent stability of temperature acclimation of photosynthesis would be reflected by differences in the limiting steps of photosynthetic rate.