Rubisco content changes are the key to determining the adaptive domestication of forest plants to high temperature adaptation.

The absorption and release of carbon by forest plant leaves plays an important role in the balance of the global atmospheric composition, which in turn affects the temperature of the Earth's surface.
Earth System Models (ESMs) are often used to predict changes in current and future carbon emissions and feedback to terrestrial ecosystems and atmospheric systems.
surface components (carbon qualm composition) in the ESM model depend heavily on understanding how environmental factors, such as temperature, affect the carbon assification process at the blade level.
Global warming is leading to a higher average daytime temperature, which is being reflected in many biomes, so how plants respond to continuous daytime temperature changes in the net photochemical rate (Anet) under light saturation conditions in vegetation ecosystems, i.e. how well they adapt (domesticate) and their internal mechanisms, has not been fully studied.
this study is a key knowledge gap for the importance of thermal adaptation to plant function in both current and future warming situations, and limits the predictive accuracy and implementation of earth system models (ESM models).
It is well known that when a plant experiences a higher growth temperature, its physiological condition, structure, bio-chemical regulation can affect the ideal photolytic temperature Topt or change its photolyzing capacity, although plants from the tropics or temperate zones (different thermal origins) will adapt, but the degree of adaptation varies according to species and functional type (Xiang et al.2013).
e.g. 76 of the 150 plants in 70 related studies currently covering multiple biomes and habitat conditions increased their light reasonable temperature or achieved a net photolytic static balance (constructive heat regulation, gain regulation) as the temperature increased, while the other 74 species The net photolysing rate decreased at high temperatures (detractable thermal regulation), and the gain-based thermal regulation response of evergreen tree species was only 36% of all cases, lower than that of C3 herbs, C4 plants and deciduous tree species, which also showed the urgency of explaining its internal mechanism.
The intrinsic physiological bio-chemical mechanisms of the three stages of the most widely used C3 plant photocodynthetic bio-chemical model (Farquhar et al.1980) (CO2 fixed enzyme (Rubisco) restricted phase, RuBP regeneration restricted phase, TPU restricted stage) are related to CO2 concentration and plant growth temperature (Tgrowth) and may affect the degree and trend of photonation domestication (adaptation).
the current ESMs model simply estimates the photolycing capacity of plants using a fixed relationship between Vcmax (maximum carbon assination rate) and nitrogen.
Therefore, as a tropical and temperate forest species with the main productivity of terrestrial ecosystems and a key ecosystem of the global atmospheric cycle, exploring their intrinsic physiological and ecological mechanisms for phototacculation/adaptation and adopting precise models are key to successfully addressing these problems.
In collaboration with the Australian National University, Associate Researcher at the Ecological Research Center of the Chengdu Institute of Biology of the Chinese Academy of Sciences analyzed and simulated models of the photochemical capabilities of 10 forest plants (6 temperate plants and 4 tropical plants) in response to multiple growth temperatures.
Based on the temperature conditions of the plants' origin, they were thermally and coldly adapted to three different daytime temperature patterns, and then CO2-Anet response curve simulations were performed on each growth temperature and co-growth temperature (25 degrees C), the maximum sterification rate (Vcmax) and the maximum electron transfer rate (Jmax) of Rubmax were calculated, and the abundance of the CO2 fixed enzyme Rubisco was determined to determine its leaf function indicators such as yelorophylor content, nitrogen content, and leaf specific gravity.
study reveals that changes in co2 fixed enzyme (Rubisco) content are key to determining the adaptive domestication of high temperatures in the photosynthetic process of tropical and temperate (wet) forest species: the leaf weight of all species decreases as temperature increases, and the maximum rate of Vcmax25 decreases linearly with growth temperature Tgrowth, accompanied by leaf proteins per unit area The decrease in content and the percentage of pyrethrinase (full nitrogen), which causes the maximum carbon assulation rate Vcmax and the net photolithing rate Anet to decrease, limits the growth of leaves in high-temperature habitats, which also makes the current widely used model not a good predictor of the actual condition of photometrics, as the current model does not take into account the regulation of Rubisco abundance by long temperature changes in rainforest tree species.
this paper proposes a new model to illustrate the effect of the decrease in Vcmax25 due to temperature regulation, which makes up for the research gap caused by the current photogasing thermal domestication model not being able to consider the sensitivity of temperature to Vcmax25.
the study, a collaboration between the Chengdu Institute of Biology of the Chinese Academy of Sciences and the Australian National University, was funded by the Chinese Academy of Sciences' Public Study Fund and the National Natural Science Foundation of China (No.31000290,31370594).
research was published in the international journal of ecology, Global Change Biology (2017), under the title Strong thermal acclimation of photosynthesis in tropical and temperate wet-forest tree species: theimportance of altered Rubisco content.
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