Response of Photosynthesis, Stomatal Conductance, Water Use Efficiency and Production to Long-Term Elevated CO2 in Winter Wheat

Tuba, Zoltán; Szente, K.; Koch, Judit

doi:10.1016/s0176-1617(11)80657-7

Cited by 77 publications

(35 citation statements)

References 34 publications

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“…Increase in grain yield under elevated CO 2 and applied nitrogen was due to production of higher number of panicles per hill and filled spikelets per panicle. This result is supported by previous reports (Siddique et al, 1989;Tuba et al, 1994) that an increase in grain yield at CO 2 enrichment and higher nitrogen could be explained by increase in total biomass and in panicle number per plant. As photosynthetic rates increased at high CO 2 and high nitrogen level, it further helped better grain filling and enhanced grain yield of rice (Reddy et al, 1995;Sharma et al, 1997).…”

Section: Filled Spikelets Per Paniclesupporting

confidence: 91%

Elevated CO2 and Nitrogen Interaction in Photosynthesis and Productivity of Modern and Local Rice (Oryza sativa L.) Cultivars

2010

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Photosynthetic rate and productivity of modern and local rice (Oryza sativa L.) cultivars were compared at different levels of nitrogen and elevated CO 2 concentrations. BRRIdhan 39 and Shakkorkhora representing modern and local cultivars, respectively were tested under the conditions of three nitrogen levels and three CO 2 concentrations. Nitrogen levels were (i) control (0 kg N ha -1 ), (ii) optimum (90 kg N ha -1 for modern and 60 kg N ha -1 for local cultivar) and (iii) supra optimum (135 kg N ha -1 for modern and 90 kg N ha -1 for local cultivar). Conversely, the three CO 2 concentrations were (i) open top chamber (OTC) with elevated CO 2 (570  50 ppm), (ii) OTC with ambient CO 2 (360 ppm) and (iii) open field. It was observed that the elevated CO 2 independently increased the photosynthetic rates in both cultivars. While in interaction, elevated CO 2 and supra optimal nitrogen increased the photosynthetic rate in modern rice cultivar only. Productivity of two rice cultivars corresponded to that of photosynthetic rates. The highest yield (50.82 g plant -1) was found in modern cultivar at supra optimal nitrogen and elevated CO 2 treatments. In contrary, the lowest yield (15.09 g plant -1) was observed in local cultivar at zero kg nitrogen treatment. However, productivity of local rice cultivar was substantially increased either by applied optimum nitrogen or by CO 2 enrichment.

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Section: Filled Spikelets Per Paniclesupporting

confidence: 91%

Elevated CO2 and Nitrogen Interaction in Photosynthesis and Productivity of Modern and Local Rice (Oryza sativa L.) Cultivars

2010

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“…Acclimation of stomatal conductance was consistently evident in wheat, potato and sorghum. Acclimation of stomatal conductance in wheat grown at twice the current ambient [CO 2 ] was also found by Tuba et al (1994). In wheat and potato the acclimation of stomatal conductance was tightly correlated with down-regulation of photosynthesis, such that C i / C a was constant (Bunce 2001a) where C i is the internal [CO 2 ].…”

Section: Stomatal Responses To the Aerial Environment At Elevated [Comentioning

confidence: 69%

“…They are wheat measured in Hungary, Arizona and Maryland, and sorghum measured in Arizona and Maryland. The mean reduction in midday stomatal conductance in wheat in Hungary at twice the current ambient [CO 2 ] was 39% (Tuba et al 1994), compared with 44% in Maryland (Bunce 2000). At about 1.5 times the current ambient [CO 2 ], the mean midday reduction in stomatal conductance in Arizona was 36% (Garcia et al 1998) and 34% in Maryland (Bunce 2000).…”

Section: Stomatal Responses To the Aerial Environment At Elevated [Comentioning

confidence: 96%

Carbon dioxide effects on stomatal responses to the environment and water use by crops under field conditions

2004

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Reductions in leaf stomatal conductance with rising atmospheric carbon dioxide concentration ([CO2]) could reduce water use by vegetation and potentially alter climate. Crop plants have among the largest reductions in stomatal conductance at elevated [CO2]. The relative reduction in stomatal conductance caused by a given increase in [CO2] is often not constant within a day nor between days, but may vary considerably with light, temperature and humidity. Species also differ in response, with a doubling of [CO2] reducing mean midday conductances by <15% in some crop species to >50% in others. Elevated [CO2] increases leaf area index throughout the growing season in some species. Simulations, and measurements in free air carbon dioxide enrichment systems both indicate that the relatively large reductions in stomatal conductance in crops would translate into reductions of <10% in evapotranspiration, partly because of increases in temperature and decreases in humidity in the air around crop leaves. The reduction in evapotranspiration in crops is similar to that in other types of vegetation which have smaller relative reductions in stomatal conductance, because of the poorer aerodynamic coupling of the canopy to the atmosphere in crops. The small decreases in evapotranspiration at elevated [CO2] may themselves be important to crop production in dry environments, but changes in climate and microclimate caused by reduced stomatal conductance could also be important to crop production.

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“…Emma in the first and cv. Martonvásári 15, MV-15) in the second experiment) [5,11]. The seed spacing was 13.0×1.5 cm.…”

Section: Winter Wheatmentioning

confidence: 99%

Modelling Net Photosynthetic Rate of Temperate Dry Grassland Species and Winter Wheat at Elevated Air Co2 Concentration

et al. 2006

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Abstract. A number of C 3 temperate dry grassland species and winter wheat plants were grown in open top chambers either at 365 µmol mol -1 (AC) or at 700 µmol mol -1 (EC) air CO 2 concentrations. Gas exchange measurements were made at several air CO 2 concentrations. When measured at higher CO 2 concentrations, net photosynthetic rate was higher in plants grown at EC than at AC. The widely accepted Farquhar net photosynthesis model was parameterized and tested using several observed data. After parameterization the test results corresponded satisfactorily with observed values under several environmental conditions.

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Response of Photosynthesis, Stomatal Conductance, Water Use Efficiency and Production to Long-Term Elevated CO2 in Winter Wheat

Cited by 77 publications

References 34 publications

Elevated CO<sub>2</sub> and Nitrogen Interaction in Photosynthesis and Productivity of Modern and Local Rice (<i>Oryza sativa</i> L.) Cultivars

Elevated CO<sub>2</sub> and Nitrogen Interaction in Photosynthesis and Productivity of Modern and Local Rice (<i>Oryza sativa</i> L.) Cultivars

Carbon dioxide effects on stomatal responses to the environment and water use by crops under field conditions

Modelling Net Photosynthetic Rate of Temperate Dry Grassland Species and Winter Wheat at Elevated Air Co2 Concentration

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