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Diverging temperature responses of CO(2) assimilation and plant development explain the overall effect of temperature on biomass accumulation in wheat leaves and grains

机译：CO（2）同化和植物发育的不同温度响应解释了温度对小麦叶片和谷粒中生物量积累的总体影响

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There is a growing consensus in the literature that rising temperatures influence the rate of biomass accumulation by shortening the development of plant organs and the whole plant and by altering rates of respiration and photosynthesis. A model describing the net effects of these processes on biomass would be useful, but would need to reconcile reported differences in the effects of night and day temperature on plant productivity. In this study, the working hypothesis was that the temperature responses of CO2 assimilation and plant development rates were divergent, and that their net effects could explain observed differences in biomass accumulation. In wheat (Triticum aestivum) plants, we followed the temperature responses of photosynthesis, respiration and leaf elongation, and confirmed that their responses diverged. We measured the amount of carbon assimilated per "unit of plant development" in each scenario and compared it to the biomass that accumulated in growing leaves and grains. Our results suggested that, up to a temperature optimum, the rate of any developmental process increased with temperature more rapidly than that of CO2 assimilation and that this discrepancy, summarised by the CO2 assimilation rate per unit of plant development, could explain the observed reductions in biomass accumulation in plant organs under high temperatures. The model described the effects of night and day temperature equally well, and offers a simple framework for describing the effects of temperature on plant growth.
机译：文献中越来越多的共识是，升高温度通过缩短植物器官和整个植物的发育以及通过改变呼吸和光合作用的速率来影响生物量的积累速率。描述这些过程对生物量的净影响的模型将是有用的，但将需要调和已报道的昼夜温度对植物生产力的影响的差异。在这项研究中，有效的假设是CO2同化的温度响应和植物发育速率不同，并且它们的净效应可以解释观察到的生物量积累差异。在小麦（Triticum aestivum）植物中，我们跟踪了光合作用，呼吸作用和叶片伸长的温度响应，并确认它们的响应有所不同。我们测量了每种情况下每个“植物发育单位”吸收的碳量，并将其与生长在叶片和谷物中的生物量进行了比较。我们的结果表明，在最高温度下，任何发育过程的速率随温度的增加比二氧化碳同化的速度更快，而这一差异（以每单位植物发育的二氧化碳同化率来概括）可以解释观察到的减少量。高温下植物器官中的生物量积累。该模型很好地描述了昼夜温度的影响，并提供了一个简单的框架来描述温度对植物生长的影响。

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