Regulation of carboxylation and photosynthetic oscillations during sun-shade acclimation in Helianthus annuus measured with a rapid-response gas exchange system
Regulation of carboxylation and photosynthetic oscillations during sun-shade acclimation in Helianthus annuus measured with a rapid-response gas exchange system
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用快速响应气体交换系统测量向日葵遮阳驯化过程中羧化和光合振荡的调节
DOI：
10.1071/pp9880239
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
A. Laisk
中科院分区：
文献类型：
--
作者：
C. Osmond;V. Oja;A. Laisk
研究了从遮荫到阳光的适应对调节光合代谢的影响，反之亦然。一年生的一个快速响应的气体交换系统被用来评估羧化相关的参数（叶肉电导率，同化电荷和CO2容量）的变化，并分析振荡CO2固定转移到高CO2浓度作为细胞间CO2浓度和光强度的函数。数据显示，在任何一个方向的驯化过程中，所有羧化相关的参数的两到三倍的变化。动态调节羧化，在振荡响应的变化作为CO2浓度的函数，在光饱和，保持不变，一致的核酮糖-1，5-二磷酸羧化酶-加氧酶在驯化过程中的协调调节。然而，光依赖性的振荡变化在驯化过程中从阴影到阳光，振荡的范围是密切相关的最大速率的稳态光合作用在CO2饱和。这些数据意味着光吸收和电子传递组件的光合机构的变化的基础上的调整行为在驯化过程中的转变。
The consequences of acclimation from shade to sun and vice versa for regulated photosynthetic metabolism were examined in H. annuus. A rapid-response gas exchange system was used to assess changes in carboxylation-related parameters (mesophyll conductance, assimilatory charge and CO2 capacity) and to analyse oscillations in CO2 fixation following transfer to high CO2 concentration as a function of intercellular CO2 concentration and light intensity. Data showed a two- to threefold change in all carboxylation-related parameters during acclimation in either direction. Dynamic regulation of carboxylation, indicated by changes in oscillatory response as a function of CO2 concentration at light saturation, remained unchanged, consistent with concerted regulation of ribulose-1,5-bisphosphate carboxylase-oxygenase during acclimation. However, the light dependency of oscillations changed during acclimation from shade to sun, and the range of oscillation was closely tied to the maximum rate of steady-state photosynthesis at CO2 saturation. These data imply that changes in the light-absorbing and electron transport components of the photosynthetic apparatus underlie the shift in regulatory behaviour during acclimation.