Response of net photosynthesis in bean (Phaseolus vulgaris) leaves to the elevation of the partial pressures of oxygen and carbon dioxide |
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Authors: | Stanislaw Maleszewski,Zofia Kami ska,Agnieszka Kondracka,Maria Mikulska |
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Affiliation: | Photosynthesis Lab. Inst. of Botany, Univ. of Warsaw, Krakowskie-Przedmieście 26/28, PL 00-927 Warsaw, Poland. |
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Abstract: | Bean ( Phaseolus vulgaris L. cv. Golden Saxa) plants were grown under low artificial light or under natural daylight. The rate of net photosynthesis (PN) was measured at: CO2 partial pressure, p(CO2), of 0.03, 0.09 or 0.15 kPa; O2 partial pressure, p(O2), of 2, 21 or 31 kPa and at light intensities of 350 or 1000 μmol m−2 s−1 (photosynthetically active radiation). In plants which had been grown under natural light, stimulation of PN at 21 kPa p(O2) was found only at elevated p(CO2) and high light. It is proposed that this phenomenon is dependent on a high capacity of the photosynthetic apparatus to regenerate ribulose 1.5-bisphosphate. |
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Keywords: | Bean carbon dioxide concentration light intensity oxygen concentration Phaseolus vulgaris Photosynthesis |
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