Diurnal and Seasonal Variations in the Photosynthetic Characteristics and the Gas Exchange Simulations of Two Rice Cultivars Grown at Ambient and Elevated CO(2).
Diurnal and Seasonal Variations in the Photosynthetic Characteristics and the Gas Exchange Simulations of Two Rice Cultivars Grown at Ambient and Elevated CO(2).
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常温和高二氧化碳条件下生长的两个水稻品种的光合特性和气体交换模拟的日变化和季节变化
DOI：
10.3389/fpls.2021.651606
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发表时间：
2021
影响因子：
5.6
通讯作者：
Wang D
中科院分区：
文献类型：
--
作者：
Miao Y;Cai Y;Wu H;Wang D
研究未来大气CO2条件下植物光合作用的日变化和季节变化，对于了解植物对全球变化的适应和估计生态生理模型的参数是必不可少的。本研究测定了两个水稻品种在开顶式气室中生长的两个水稻品种的净光合速率(ANT)、气孔导度(GS)和光化学效率(Fv‘/Fm’)在2年的生长季节中的日变化。结果表明，CO_2浓度升高显著提高了玉米的净资产，尤其是拔节期。这种刺激随着生长季节的推进而适应，不受气孔限制和Rubisco活性的影响。光合作用模型中的模型参数(Vcmax、Jmax和Rd)和两个气孔导度模型(m和g1)的参数在不同的生育时期是不同的，m和g1在不同的(CO2)处理和不同品种之间也是不同的，这使得使用这些品种、CO2和阶段特定的参数来模拟光合作用和气孔导度更加准确。研究结果表明，在未来CO2浓度升高的条件下，光合作用能力驯化的主导因素仍需进一步研究。该研究还强调，有必要研究其他环境因素，如氮和臭氧，以及非环境因素，如额外的水稻品种，对光合作用和气孔导度模型中这些参数的变化的影响，以及它们对大尺度碳和水循环模拟的进一步影响。
Investigating the diurnal and seasonal variations of plant photosynthetic performance under future atmospheric CO2 conditions is essential for understanding plant adaptation to global change and for estimating parameters of ecophysiological models. In this study, diurnal changes of net photosynthetic rate (Anet), stomatal conductance (gs), and photochemical efficiency of PSII (Fv′/Fm′) were measured in two rice cultivars grown in the open-top-chambers at ambient (∼450 μmol mol–1) and elevated (∼650 μmol mol–1) CO2 concentration [(CO2)] throughout the growing season for 2 years. The results showed that elevated (CO2) greatly increased Anet, especially at jointing stage. This stimulation was acclimated with the advance of growing season and was not affected by either stomatal limitations or Rubisco activity. Model parameters in photosynthesis model (Vcmax, Jmax, and Rd) and two stomatal conductance models (m and g1) varied across growing stages and m and g1 also varied across (CO2) treatments and cultivars, which led to more accurate photosynthesis and stomatal conductance simulations when using these cultivar-, CO2-, and stage- specific parameters. The results in the study suggested that further research is still needed to investigate the dominant factors contributing to the acclimation of photosynthetic capacity under future elevated CO2 conditions. The study also highlighted the need of investigating the impact of other environmental, such as nitrogen and O3, and non-environmental factors, such as additional rice cultivars, on the variations of these parameters in photosynthesis and stomatal conductance models and their further impacts on simulations in large scale carbon and water cycles.
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影响因子：
6.2
作者：
Ainsworth, EA;Rogers, A;Long, SP
通讯作者：
Long, SP
影响因子：
11.6
作者：
Cai, Chuang;Yin, Xinyou;Pan, Genxing
通讯作者：
Pan, Genxing
影响因子：
7.3
作者：
Bernacchi, CJ;Singsaas, EL;Long, SP
通讯作者：
Long, SP
影响因子：
3.7
作者：
Bunce, JA
通讯作者：
Bunce, JA
影响因子：
7.3
作者：
Bernacchi, CJ;Pimentel, C;Long, SP
通讯作者：
Long, SP