Application to wheat triticum aestivum and barley hordeum vulgare of 2 leaf photosynthesis models for 3 carbon pathway plants

Day, W.; Parkinson, K.J.

Plant Cell and Environment 5(6): 501-507


ISSN/ISBN: 0140-7791
Accession: 004775123

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Two models describing the relationship between net photosynthesis of leaves of C3 [3-carbon pathway] plants, light intensity and CO2 concentration in the substomatal cavities are described and fitted to data obtained in a constant environment cabinet and in the field. The 1st model, based on a resistance analog for gaseous diffusion and Michaelis-Menten biochemistry, gave the best fit to the data. For the field data, 4 parameters were required (quantum yield, mesophyll resistance, day respiration and a photorespiration constant). For the cabinet data, a parameter representing the limiting photosynthesis rate was required. The 2nd model, based on a recent, more rigorous biochemical analysis of photosynthesis, contains 5 parameters (quantum yield, maximum carboxylation rate, day respiration, a photorespiration constant and a maximum electron transport rate. It fitted the data less well.