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- Author or Editor: Andy Mauromoustakos x
Temperature is an important factor determining net CO2 assimilation (A). The reported optimum temperature for A in apple (Malus × domestic, Borkh.) under controlled conditions is between 16-30C. Response of A to temperature as it occurs in the field was measured with an open system IRGA for both spur and shoot leaves during 12 days from April through August of 1992. Trees studied were 11-year-old `Golden Delicious', `Spartan' and `Newred Jonathan' on M.7a trained to a three wire trellis. Response to temperature from 17-36C was quadratic for both spur and shoot leaves, but at each temperature A varied by about 10 μmol.m-2.s-1. Part of the variation was attributed to varying ambient [CO2] which varied from 321 to 396 ppm, depending on date of measurement. Covariate analysis using [CO2] as the covariate was conducted. Thus, the A model of temperature response takes into account [CO2]. The data will be discussed in view of interpreting plant response in the field and inherent problems with measuring A in situ.