Abstract
The effects of CO2 enrichment on growth and N allocation of rice (Oryza sativa L.) were examined. The plants were grown hydroponically in growth chambers with a 14-h photoperiod (1000 [mu]mol quanta m-2 s-1) and a day/night temperature of 25/20[deg]C. From the 28th to 70th d after germination, the plants were exposed to two CO2 partial pressures, namely 36 and 100 Pa. The CO2 enrichment increased the final biomass, but this was caused by a stimulation of the growth rate during the first week of the exposure to elevated CO2 partial pressures. The disappearance of the initial stimulation of the growth rate was associated with a decreased leaf area ratio. Furthermore, CO2 enrichment decreased the investment of N in the leaf blades, whereas the N allocation into the leaf sheaths and roots increased. Thus, the decrease in leaf N content by CO2 enrichment was not due to dilution of N caused by a relative increase in the plant biomass but was due to the change in N allocation at the whole-plant level. We conclude that the growth responses of rice to CO2 enrichment are mainly controlled by leaf area expansion and N allocation into leaf blades at the whole-plant level.
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Selected References
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- Makino A., Nakano H., Mae T. Responses of Ribulose-1,5-Bisphosphate Carboxylase, Cytochrome f, and Sucrose Synthesis Enzymes in Rice Leaves to Leaf Nitrogen and Their Relationships to Photosynthesis. Plant Physiol. 1994 May;105(1):173–179. doi: 10.1104/pp.105.1.173. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Masle J., Hudson G. S., Badger M. R. Effects of Ambient CO2 Concentration on Growth and Nitrogen Use in Tobacco (Nicotiana tabacum) Plants Transformed with an Antisense Gene to the Small Subunit of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase. Plant Physiol. 1993 Dec;103(4):1075–1088. doi: 10.1104/pp.103.4.1075. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Nakano H., Makino A., Mae T. The Effect of Elevated Partial Pressures of CO2 on the Relationship between Photosynthetic Capacity and N Content in Rice Leaves. Plant Physiol. 1997 Sep;115(1):191–198. doi: 10.1104/pp.115.1.191. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Roden J. S., Ball M. C. The Effect of Elevated [CO2] on Growth and Photosynthesis of Two Eucalyptus Species Exposed to High Temperatures and Water Deficits. Plant Physiol. 1996 Jul;111(3):909–919. doi: 10.1104/pp.111.3.909. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Xu D. Q., Gifford R. M., Chow W. S. Photosynthetic Acclimation in Pea and Soybean to High Atmospheric CO2 Partial Pressure. Plant Physiol. 1994 Oct;106(2):661–671. doi: 10.1104/pp.106.2.661. [DOI] [PMC free article] [PubMed] [Google Scholar]