Activation of photoprotective winter photoinhibition in plants from different environments: a literature compilation and meta-analysis
Activation of photoprotective winter photoinhibition in plants from different environments: a literature compilation and meta-analysis
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DOI：
10.1111/ppl.12329
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发表时间：
2015-12-01
影响因子：
6.4
通讯作者：
Ignacio Garcia-Plazaola, Jose
中科院分区：
文献类型：
--
作者：
Miguez, Fatima;Fernandez-Marin, Beatriz;Ignacio Garcia-Plazaola, Jose
越冬植物面临着光捕获和利用这种激发进行光合作用之间的明显不平衡。作为响应，植物上调热耗散，伴随着光化学效率的降低，在一个过程中，其特征在于在变暖后缓慢恢复。这种持续的光化学效率下降在这里被称为冬季光抑制（WPI）。WPI已在针叶树和少数越冬作物中得到广泛研究，但其他植物物种受到的关注较少。此外，文献显示了一些关于WPI与叶黄素的关联以及控制叶黄素转化的环境条件的争议。为了概述当前知识并确定WPI机制的知识差距，我们对1991-2011年期间发表的文献进行了全面的荟萃分析。所有出版物包含测量的Fv/Fm的寒冷时期和相应的温暖的控制，包括在我们的最终数据库的190项研究162种。WPI估计为Fv/Fm的相对降低。高WPI总是伴随着高（A+Z）/（V+A+Z）。持久WPI的激活与空气温度直接相关，阈值约为0 ℃。热带植物比非热带植物呈现更早（在> 0 ° C的温度下）和更高的WPI。我们的结论是：（1）叶黄素依赖的WPI机制的激活是维持光合结构在零度以下的温度，而（2）缺乏（或低水平）的WPI不一定与低（A+Z）/（V+A+Z）;和（3）的空气温度，触发持久的WPI，和WPI的最高水平，不依赖于植物的生长习性或生物气候起源的物种。
Overwintering plants face a pronounced imbalance between light capture and use of that excitation for photosynthesis. In response, plants upregulate thermal dissipation, with concomitant reductions in photochemical efficiency, in a process characterized by a slow recovery upon warming. These sustained depressions of photochemical efficiency are termed winter photoinhibition (WPI) here. WPI has been extensively studied in conifers and in few overwintering crops, but other plant species have received less attention. Furthermore, the literature shows some controversies about the association of WPI with xanthophylls and the environmental conditions that control xanthophylls conversion. To overview current knowledge and identify knowledge gaps on WPI mechanisms, we performed a comprehensive meta-analysis of literature published over the period 1991-2011. All publications containing measurements of Fv/Fm for a cold period and a corresponding warm control were included in our final database of 190 studies on 162 species. WPI was estimated as the relative decrease in Fv/Fm. High WPI was always accompanied by a high (A+Z)/(V+A+Z). Activation of lasting WPI was directly related to air temperature, with a threshold of around 0 degrees C. Tropical plants presented earlier (at a temperature of > 0 degrees C) and higher WPI than non-tropical plants. We conclude that (1) activation of a xanthophyll-dependent mechanism of WPI is a requisite for maintaining photosynthetic structures at sub-zero temperatures, while (2) absence (or low levels) of WPI is not necessarily related to low (A+Z)/(V+A+Z); and (3) the air temperature that triggers lasting WPI, and the maximum level of WPI, do not depend on plant growth habit or bioclimatic origin of species.