Light responses of photosynthesis and transpiration of two tomato cultivars under ambient and altered CO2 and O2 |
| |
Authors: | AN Lakso JF Bierhuizen GFP Martakis |
| |
Institution: | Department of Horticulture, Agricultural University, Wageningen, The Netherlands |
| |
Abstract: | Young plants of two tomato (Lycopersicon esculentum L.) cultivars, ‘Sonatine’ and ‘F6-IVT’, were examined for whole plant photosynthesis and transpiration in a closed gas-exchange system under different light levels and a combination of high or low oxygen (21 or 1%) and high or low carbon dioxide concentrations (1850 or 550 mg m?3). With saturating light, both cultivars showed approximately equivalent increases in photosynthesis in response to lowering the oxygen concentration, raising the carbon dioxide, or both. Under non-saturating light, ‘F6-IVT’ responded positively to lowered oxygen but CO2 had little effect. In ‘Sonatine’, changes in O2 as well as CO2 gave photosynthetic enhancement under low light. Stomates responded primarily to CO2 with little response to O2. As a result of the stomatal behavior to light, plant water-use efficiency in the short term peaked at moderate light levels, was enhanced by low O2, but was enhanced most by high CO2, regardless of O2 concentration. |
| |
Keywords: | carbon dioxide concentration light oxygen concentration photosynthesis tomato transpiration |
本文献已被 ScienceDirect 等数据库收录! |
|