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Photosynthetic heat tolerances and extreme leaf temperatures
Functional Ecology ( IF 4.6 ) Pub Date : 2020-08-08 , DOI: 10.1111/1365-2435.13658 Timothy M. Perez 1, 2 , Kenneth J. Feeley 1, 2
中文翻译：
光合耐热性和极端叶片温度
更新日期：2020-08-08
Functional Ecology ( IF 4.6 ) Pub Date : 2020-08-08 , DOI: 10.1111/1365-2435.13658 Timothy M. Perez 1, 2 , Kenneth J. Feeley 1, 2
Affiliation
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- Photosynthetic heat tolerances (PHTs) have several potential applications including predicting which species will be most vulnerable to climate change. Given that plants exhibit unique thermoregulatory traits that influence leaf temperatures and decouple them from ambient air temperatures, we hypothesized that PHTs should be correlated with extreme leaf temperatures as opposed to air temperatures.
- We measured leaf thermoregulatory traits, maximum leaf temperatures (TMO) and two metrics of PHT (Tcrit and T50) quantified using the quantum yield of photosystem II for 19 plant species growing in Fairchild Tropical Botanic Garden (Coral Gables, FL, USA). Thermoregulatory traits measured at the Garden and microenvironmental variables were used to parameterize a leaf energy balance model that estimated maximum in situ leaf temperatures (TMIS) across the geographic distributions of 13 species.
- TMO and TMIS were positively correlated with T50 but were not correlated with Tcrit. The breadth of species' thermal safety margins (the difference between T50 and TMO) was negatively correlated with T50.
- Our results provide observational and theoretical support based on a first principles approach for the hypothesis that PHTs may be adaptations to extreme leaf temperature, but refute the assumption that species with higher PHTs are less susceptible to thermal damage. Our study also introduces a novel method for studying plant ecophysiology by incorporating biophysical and species distribution models, and highlights how the use of air temperature versus leaf temperature can lead to conflicting conclusions about species vulnerability to thermal damage.
中文翻译：
光合耐热性和极端叶片温度
- 光合耐热性（PHT）具有多种潜在应用，包括预测哪些物种最容易受到气候变化的影响。考虑到植物表现出独特的温度调节特性，这些特性会影响叶片温度并使它们与周围空气温度脱钩，因此我们假设PHT应该与极端叶片温度（而不是空气温度）相关联。
- 我们测量了光子系统的叶片温度调节性状，最高叶片温度（T MO）和两个PHT指标（T crit和T 50），使用光系统II的量子产率对飞兆热带植物园（佛罗里达州科勒尔盖布尔斯）中生长的19种植物进行了定量）。在花园测量的温度调节性状和微环境变量被用于参数化叶片能量平衡模型，该模型估计了13种物种地理分布中的最大原位叶片温度（T MIS）。
- T MO和T MIS与T 50呈正相关，与T crit无关。物种热安全裕度的广度（T 50与T MO之间的差）与T 50负相关。
- 我们的结果基于第一原理方法为PHT可能适应极端叶片温度的假设提供了观察和理论支持，但驳斥了具有较高PHT的物种对热损害较不敏感的假设。我们的研究还引入了一种通过结合生物物理模型和物种分布模型来研究植物生态生理学的新方法，并强调了使用气温与叶片温度的关系如何得出关于物种对热损害的脆弱性的矛盾结论。
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