Acclimation of photosynthesis to temperature in eight cool and warm climate herbaceous C3 species:: Temperature dependence of parameters of a biochemical photosynthesis model
Acclimation of photosynthesis to temperature in eight cool and warm climate herbaceous C3 species:: Temperature dependence of parameters of a biochemical photosynthesis model
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DOI：
10.1023/a:1006325724086
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发表时间：
2000-01-01
影响因子：
3.7
通讯作者：
Bunce, JA
中科院分区：
文献类型：
--
作者：
Bunce, JA
为了确定Farquhar型光合作用模型的参数如何随测量温度和生长温度而变化，在15和25摄氏度下生长了八种凉爽和温暖气候的草本作物和杂草物种，并在15 - 35摄氏度的范围内测量了单叶二氧化碳和水蒸气交换率。光合参数包括同化速率（A）对气孔下CO2浓度（C-i）的初始斜率、高C-i时的A和气孔导度。前两个测量允许计算V-Cmax，核酮糖二磷酸羧化酶的最大羧化速率和J（max），Farquhar型光合作用模型的光合电子传递的最大速率。在所有物种中，气孔导度随温度呈指数增加在整个范围内的15 - 35摄氏度，即使当A在高测量温度下降。在这个温度范围内，温暖气候物种的电导率（4.3倍）比凉爽气候物种（2.5倍）有较大的增加。A相对于C1的初始斜率表现出范围为20至30 ℃的最佳温度。在较暖的生长温度下，冷性树种的最适温度比暖性树种的最适温度有较大幅度的增加。A在高C-i下的最适温度范围为25 - 30 ℃，但随生长温度变化不大。在暖性气候种中，随着生长温度的升高，A对C-i的初始斜率和高C-i时的A的绝对值增加了约10%，而在冷性气候种中，则降低了约20%。标准化到20摄氏度的J（最大）- V-Cmax的比率在物种和生长温度之间变化超过2倍，但是光合作用的温度响应的差异与J（最大）和V-Cmax的温度依赖性的变化比它们的标准化值的比率更相关。
To determine how parameters of a Farquhar-type photosynthesis model varied with measurement temperature and with growth temperature, eight cool and warm climate herbaceous crop and weed species were grown at 15 and 25 degrees C and single leaf carbon dioxide and water vapor exchange rates were measured over the range of 15 - 35 degrees C. Photosynthetic parameters examined were the initial slope of the response of assimilation rate (A) to substomatal carbon dioxide concentration (C-i), A at high C-i, and stomatal conductance. The first two measurements allow calculation of V-Cmax, the maximum rate of carboxylation of ribulose bisphosphate carboxylase and J(max), the maximum rate of photosynthetic electron transport, of Farquhar-type photosynthesis models. In all species, stomatal conductance increased exponentially with temperature over the whole range of 15 - 35 degrees C, even when A decreased at high measurement temperature. There were larger increases in conductance over this temperature range in the warm climate species (4.3 x) than in the cool climate species (2.5 x). The initial slope of A vs. C-i exhibited an optimum temperature which ranged from 20 to 30 degrees C. There was a larger increase in the optimum temperature of the initial slope at the warmer growth temperature in the cool climate species than in the warm climate species. The optimum temperature for A at high C-i ranged from 25 to 30 degrees C among species, but changed little with growth temperature. The absolute values of both the initial slope of A vs. C-i and A at high C-i were increased about 10% by growth at the warmer temperature in the warm climate species, and decreased about 20% in the cool climate species. The ratio of J(max) - V-Cmax normalized to 20 degrees C varied by more than a factor of 2 across species and growth temperatures, but differences in the temperature response of photosynthesis were more related to variation in the temperature dependencies of J(max) and V-Cmax than to the ratio of their normalized values.