caa a22 4500 39752286X CHVBK 20180308164638.0 cr unu---uuuuu 161202e199509 xx s 000 0 eng 10.1093/jxb/46.special_issue.1389 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.special_issue.1389 Improving plant production by selection for survival at low CO2 concentrations [Elektronische Daten] [Hipolito Medrano, Alfred J. Keys, David W. Lawlor, Martin A.J. Parry, Joaquim Azcon-Bieto, Esteban Delgado] Attempts to select C3 plants with slow rates of photo-respiration and increased rates of net photosynthesis have met with little success. This review analyses the properties of mutant genotypes of tobacco (Nicotiana tabacum L. cv. Wisconsin), derived from selection of haploid plants (produced by in vitro mutagenesis of anthers) which survived in CO2 concentrations close to the compensation point. Survivors were diploidized and doubled-haploid plants were self-pollinated to obtain seeds (the selected genotypes). Several glasshouse and field experiments showed that the method of selection at low CO2 concentrations gave genotypes with increased capacity for total dry matter accumulation; increases were similar (mean 24%; range 14-36%) in different conditions for two selected genotypes (SP422 and SP451) when compared to the parental genotype Wisconsin-38. This increase was related to a greater leaf area per plant (mean increase 19%; range 9-43%), to faster photosynthetic rates in mature and old leaves and to similar rates of dark respiration per unit leaf area, but smaller rates per unit dry matter. These changes were related to a greater number of mesophyll cells of smaller size in the selected genotypes. However, the increased productivity could not be related to reduced photorespiration rate or CO2 compensation point nor to improved Rubisco properties (e.g. increased specificity factor) which the selection method was designed to achieve. Selection by survival at low CO2 produced genotypes able to invest more assimilate in growing larger leaves and to maintain a better leaf carbon balance than the parent genotype. These features improved light capture and carbon accumulation and thus increased dry matter production. © 1995 Oxford University Press Photorespiration: Alternative Pathways: Carbon Allocation nationallicence Photosynthesis nationallicence tobacco nationallicence plant production nationallicence CO2 compensation point nationallicence Medrano Hipolito Departamento de Biologia Ambiental, Universitat de les Illes Balears, Institut d'Estudts Avançais de les Illes Balears (CSIC) 07071-Palma de Mallorca, Spain aut Keys Alfred J. Department of Biochemistry and Physiology, Rothamsted Experimental Station Harpenden, Herts AL5 2JQ, UK aut Lawlor David W. Department of Biochemistry and Physiology, Rothamsted Experimental Station Harpenden, Herts AL5 2JQ, UK aut Parry Martin A.J. Department of Biochemistry and Physiology, Rothamsted Experimental Station Harpenden, Herts AL5 2JQ, UK aut Azcon-Bieto Joaquim Departamento de Biologia Vegetal, Facultad de Biologia, Universitat de Barcelona Diagonal 65, 08028-Barcelona, Spain aut Delgado Esteban Departamento de Biologia Ambiental, Universitat de les Illes Balears, Institut d'Estudts Avançais de les Illes Balears (CSIC) 07071-Palma de Mallorca, Spain aut Journal of Experimental Botany Oxford University Press 46/special_issue(1995-09), 1389-1396 0022-0957 46:special_issue<1389 1995 46 exbotj https://doi.org/10.1093/jxb/46.special_issue.1389 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.special_issue.1389 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Medrano Hipolito Departamento de Biologia Ambiental, Universitat de les Illes Balears, Institut d'Estudts Avançais de les Illes Balears (CSIC) 07071-Palma de Mallorca, Spain aut NATIONALLICENCE 700 1- Keys Alfred J. Department of Biochemistry and Physiology, Rothamsted Experimental Station Harpenden, Herts AL5 2JQ, UK aut NATIONALLICENCE 700 1- Lawlor David W. Department of Biochemistry and Physiology, Rothamsted Experimental Station Harpenden, Herts AL5 2JQ, UK aut NATIONALLICENCE 700 1- Parry Martin A.J. Department of Biochemistry and Physiology, Rothamsted Experimental Station Harpenden, Herts AL5 2JQ, UK aut NATIONALLICENCE 700 1- Azcon-Bieto Joaquim Departamento de Biologia Vegetal, Facultad de Biologia, Universitat de Barcelona Diagonal 65, 08028-Barcelona, Spain aut NATIONALLICENCE 700 1- Delgado Esteban Departamento de Biologia Ambiental, Universitat de les Illes Balears, Institut d'Estudts Avançais de les Illes Balears (CSIC) 07071-Palma de Mallorca, Spain aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/special_issue(1995-09), 1389-1396 0022-0957 46:special_issue<1389 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