In vivo temperature response functions of parameters required to model RuBP-limited photosynthesis
In vivo temperature response functions of parameters required to model RuBP-limited photosynthesis
复制标题
DOI：
10.1046/j.0016-8025.2003.01050.x
复制
发表时间：
2003-09-01
影响因子：
7.3
通讯作者：
Long, SP
中科院分区：
文献类型：
--
作者：
Bernacchi, CJ;Pimentel, C;Long, SP
Farquhar，von Caemmerer & Berry（Planta 149，78 - 90，1980）的C-3光合作用的叶片模型为从叶片到冠层的碳交换和地球系统模型提供了基础，并被广泛用于预测生物圈对全球变化的响应。这种缩放需要在比模型最初参数化的温度范围更宽的温度范围内使用叶子模型。叶片模型假设叶片内的光合CO2吸收要么受到核酮糖-1，5-二磷酸（RuBP）再生速率的限制，要么受到RuBP羧化酶-加氧酶（Rubisco）活性的限制。以前，我们报告了一个重新参数化的Rubisco活性的温度响应，证明了强大的应用到一系列的物种时。在这里，这是扩展到重新参数化的RuBP限制光合作用的温度响应。RuBP限制的光合作用被假定为依赖于整个链的电子传递速率，这是一个三参数的非矩形双曲函数的光子通量。本文中，这三个参数是在10至40摄氏度的温度下通过同时测量烟草叶片的叶绿素荧光和CO2交换来确定的。所有变化显着的温度，并进一步修改与变化的生长温度从15至35摄氏度。这些参数密切预测RuBP限制光合作用的响应，在柠檬和白杨测量的温度，并显示出显着的改善预测的基础上早期的参数化。我们提供了使用Farquhar等人（1980）的模型所需的方程，并给出了新推导的温度函数，用于预测Rubisco和RuBP限制的光合作用。
The leaf model of C-3 photosynthesis of Farquhar, von Caemmerer & Berry ( Planta 149, 78 - 90, 1980) provides the basis for scaling carbon exchange from leaf to canopy and Earth-System models, and is widely used to project biosphere responses to global change. This scaling requires using the leaf model over a wider temperature range than that for which the model was originally parameterized. The leaf model assumes that photosynthetic CO2 uptake within a leaf is either limited by the rate of ribulose-1,5-bisphosphate (RuBP) regeneration or the activity of RuBP carboxylase-oxygenase ( Rubisco). Previously we reported a re-parameterization of the temperature responses of Rubisco activity that proved robust when applied to a range of species. Herein this is extended to re-parameterizing the response of RuBP-limited photosynthesis to temperature. RuBP-limited photosynthesis is assumed to depend on the whole chain electron transport rate, which is described as a three-parameter non-rectangular hyperbolic function of photon flux. Herein these three parameters are determined from simultaneous measurement of chlorophyll fluorescence and CO2 exchange of tobacco leaves, at temperatures from 10 to 40 degreesC. All varied significantly with temperature and were modified further with variation in growth temperature from 15 to 35 degreesC. These parameters closely predicted the response of RuBP-limited photosynthesis to temperature measured in both lemon and poplar and showed a significant improvement over predictions based on earlier parameterizations. We provide the necessary equations for use of the model of Farquhar et al. (1980) with our newly derived temperature functions for predicting both Rubiscoand RuBP-limited photosynthesis.