caa a22 4500 397521537 CHVBK 20180308164634.0 cr unu---uuuuu 161202e199507 xx s 000 0 eng 10.1093/jxb/46.7.847 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.7.847 The effect of elevated atmospheric CO2 and drought onstomatal frequency in groundnut (Arachis hypogaea (L.)) [Elektronische Daten] [S.C. Clifford, C.R. Black, J.A. Roberts, I.M. Stronach, P.R. Singleton-Jones, A.D. Mohamed, S.N. Azam-Ali] The effects of elevated atmospheric CO2, alone or in combination with water stress, on stomatal frequency in groundnut (Arachis hypogaea (L.) cv. Kadiri-3) were investigated. CO2 exerted significant effects on stomatal frequency only in irrigated plants. The effects of drought on leaf development out weighed the smaller effects of CO2 concentration, although reductions in stomatal frequency induced by elevated atmo-spheric CO2 were still observed. When stands of groundnut were grown under irrigated conditions with unrestricted root systems, an increase in atmospheric CO2 from 375 to 700 ppmv decreased stomatal frequency on both leaf surfaces by up to 16% in droughted plants, stomatal frequency was reduced by 8% on the adaxial leaf surface only. Elevated atmospheric CO2 promoted larger reductions in leaf conductance than the changes in stomatal frequency, indicating partial stomatal closure. As a result, the groundnut stands grown at elevated CO2 utilized the available soil moisture more slowly than those grown under ambient CO2, there by extending the growing period. Despite the large variations in cell frequencies induced by drought, there was no treatment effect on either stomatal index or the adaxial/abaxial stomatalfrequency ratio. The data suggest that the effects of future increases in atmospheric CO2 concentration on stomatal frequency in groundnut are likely to be small, especially under conditions of water stress, but that the combination of associated reductions in leaf con-ductance and enhanced assimilation at elevated CO2 will be important in semi-arid regions © Oxford University Press Research Papers nationallicence Arachis hypogaea L nationallicence Leguminosae nationallicence groundnu nationallicence stomatal frequency nationallicence CO2 nationallicence drought nationallicence Clifford S.C. Tropical Crops Research Unit, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut Black C.R. Department of Physiology and Environmental Science, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut Roberts J.A. Department of Physiology and Environmental Science, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut Stronach I.M. Tropical Crops Research Unit, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut Singleton-Jones P.R. Tropical Crops Research Unit, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut Mohamed A.D. Tropical Crops Research Unit, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut Azam-Ali S.N. Tropical Crops Research Unit, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut Journal of Experimental Botany Oxford University Press 46/7(1995-07), 847-852 0022-0957 46:7<847 1995 46 exbotj https://doi.org/10.1093/jxb/46.7.847 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.7.847 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Clifford S.C. Tropical Crops Research Unit, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut NATIONALLICENCE 700 1- Black C.R. Department of Physiology and Environmental Science, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut NATIONALLICENCE 700 1- Roberts J.A. Department of Physiology and Environmental Science, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut NATIONALLICENCE 700 1- Stronach I.M. Tropical Crops Research Unit, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut NATIONALLICENCE 700 1- Singleton-Jones P.R. Tropical Crops Research Unit, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut NATIONALLICENCE 700 1- Mohamed A.D. Tropical Crops Research Unit, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut NATIONALLICENCE 700 1- Azam-Ali S.N. Tropical Crops Research Unit, University of Nottingham Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/7(1995-07), 847-852 0022-0957 46:7<847 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford