Photosynthetica 2016, 54(1):152-157 | DOI: 10.1007/s11099-015-0166-6

An improved method for the simultaneous determination of photosynthetic O2 evolution and CO2 consumption in Rhizophora mucronata leaves

T. Z. Ulqodry1,3, A. Nose2,*, S. H. Zheng2
1 The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima, Japan
2 Faculty of Agriculture, Saga University, Saga, Japan
3 Department of Marine Science, Sriwijaya University, South Sumatera, Indonesia

The photosynthetic gas-exchange has been assessed traditionally either as O2 evolution or CO2 consumption. In this study, we used a liquid-phase O2 electrode combined with CO2 optodes to examine simultaneously photosynthesis in intact leaves of mangrove Rhizophora mucronata. We verified suitable conditions for leaf photosynthetic rates by assessing pH levels and NaHCO3 concentrations and compared these to the gas-exchange method at various PAR levels. The photosynthetic rate in response to pH exhibited a similar pattern both for O2 evolution and CO2 consumption, and higher rates were associated with intermediate pH compared with low and high pH values. The net photosynthetic quotient (PQ) of R. mucronata leaves ranged from 1.04-1.28. The PQ values, which were never lesser than 1, suggested that photorespiration did not occur in R. mucronata leaves under aqueous conditions. The similar maximum photosynthetic rates suggested that all measurements had a high capacity to adjust the photosynthetic apparatus under a light saturation condition. The simultaneous measurements of O2 evolution and CO2 consumption using the Clark oxygen electrode polarographic sensor with the CO2 optode sensor provided a simple, stable, and precise measurement of PQ under aqueous and saturated light conditions.

Keywords: carbon dioxide consumption; oxygen evolution; photosynthetic performance

Received: April 8, 2015; Accepted: June 22, 2015; Published: March 1, 2016Show citation

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Ulqodry, T.Z., Nose, A., & Zheng, S.H. (2016). An improved method for the simultaneous determination of photosynthetic O2 evolution and CO2 consumption in Rhizophora mucronata leaves. Photosynthetica, 54(1), 152-157. doi: 10.1007/s11099-015-0166-6.
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