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Effect of phosphorus deficiency on photosynthetic and respiratory CO 2 exchanges were analysed in primary leaves of 2-week-old bean (Phaseolus vulgaris L. cv. Golden Saxa) plants under non-photorespiratory (2 % O 2 ) and photorespiratory (21 % O 2 ) conditions. Low P decreased maximum net photosynthetic rate (P Nmax ) and increased the time necessary to reach it. In the leaves of P-deficient plants the relative decrease of P Nmax at 2 % O 2 was larger than at 21 % O 2 . The results suggested the influence of photorespiration in the cellular turnover of phosphates.

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