
TY  - JOUR
A1  - Osmond, CB 
A1  - Oja, V 
A1  - Laisk, A 
T1  - Regulation of Carboxylation and Photosynthetic Oscillations During Sun-Shade Acclimation in <I>Helianthus annuus</I> Measured With a Rapid-Response Gas Exchange System
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 1988
VL  - 15
IS  - 2
SP  - 239
EP  - 251
KW  - 
UR  - https://doi.org/10.1071/PP9880239 
N2  - 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. 
ER  -

