Abstract
Carbon dioxide compensation concentration,Г, net photosynthetic rate,Pn, and photorespiration rate,Rl, were measured in young, adult and old primary leaves ofPhaseolus vulgaris L. over a range of photon flux densities using a closed system with IRGA. Irrespective of leaf age,Г decreased rapidly with rising photon flux density up toca. 260 (μmol m−2 s−1. From this valueГ did not change with photon flux density under constant temperature, reaching on the average 178, 118 and 239 mg m−3 in young, adult and old leaves, respectively. Changes with age in curves relatingPn andRl to photon flux density were found.
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