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Is The Parameter Electron Transport Rate Useful As A Predictor Of Photosynthetic Carbon Assimilation Rate

Y. Miyazawa, H. Yahata
Published 2006 · Chemistry

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We compared the photosynthetic carbon assimilation rate (A) and the simultaneously measured electron transport rate (ETR) through photosystem II in order to examine the reliability of the A estimation method based on the ETR values and A-ETR relationships under fi eld conditions. We fi rst compared the ETR with the A values, which were calculated using biochemical models, under different temperature conditions typical in August, November and February. We established the regression lines of A with ETR values at reference conditions (mean leaf temperature and leaf intercellular CO2 partial pressure, Ci in each season). When leaf temperatures and Ci changed from the reference conditions according to diurnal changes in the environment, the relationship between A and ETR changed from the regression lines, but the error of the estimated A values was modest in each season’s biochemical calculations. The correlation of A with the ETR values derived from the data in the fi eld measurements was, however, too weak to precisely regress the A values based on the ETR values. This weak correlation would be due to the low leaf internal conductance in the measured leaves and large differences in physiological traits, such as temperature dependence, among the leaves. Thus, we concluded that in a fi eld with spatially and temporally heterogeneous environmental conditions, A estimation based on the ETR values would be diffi cult.
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