Changes induced by low oxygen concentration in photosynthetic and respiratory CO2 exchange in phosphate-deficient bean leaves
Maleszewski, S.(University of Bialystok (Poland). Inst. of Biology)E-mail:[email protected] | Ciereszko, I.(University of Bialystok (Poland). Inst. of Biology) | Skowronska, A.(University of Bialystok (Poland). Inst. of Biology) | Mieczejko, E.(University of Bialystok (Poland). Inst. of Biology) | Kozlowska-Szerenos, B.(University of Bialystok (Poland). Inst. of Biology)
Effect of phosphorus deficiency on photosynthetic and respiratory CO2 exchanges were analysed in primary leaves of 2-week-old bean (Phaseolus vulgaris cv. Golden Saxa) plants under non-photorespiratory (2% O2) and photorespiratory (21% O2) conditions. Low P decreased maximum net photosynthetic rate (PNmax) and increased the time necessary to reach it. In the leaves of P-deficient plants the relative decrease of PNmax at 2% O2 was larger than at 21% O2. The results suggested the influence of photorespiration in the cellular turnover of phosphates.
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