Lancaster EPrints

Photosynthesis, ribulose-1,5-bisphosphate carboxylase and leaf characteristics of Nicotiana tabacum L. genotypes selected by survival at low CO2 concentrations

Delgado, Esteban and Parry, Martin A. J. and Lawlor, David W. and Keys, Alfred J. and Medrano, Hipolito (1993) Photosynthesis, ribulose-1,5-bisphosphate carboxylase and leaf characteristics of Nicotiana tabacum L. genotypes selected by survival at low CO2 concentrations. Journal of Experimental Botany, 44 (1). pp. 1-7. ISSN 0022-0957

Full text not available from this repository.

Abstract

The photosynthetic characteristics (responses to CO2 and light), ribulose-1,5-bisphosphate carboxylase (Rubisco) properties, and the size and number of cells of the mesophyll of Nicotiana tabacum L. leaves of genotypes selected for survival at low atmospheric CO2 concentrations are described. When grown in the greenhouse with nutrient solutions, the total dry matter production of the selected genotypes was 23% greater than that of the parent genotype; this increase was related to a greater number of mesophyll cells of smaller size in the selected plants compared to the parent. However, it was not related to changes in the photosynthetic characteristics nor to Rubisco properties. These results suggest that the increased dry matter accumulation of the selected genotypes is not due to a reduction in photorespiration nor an increase in the CO2 assimilation rates. Rather, the selection of haploid tobacco plantlets in low CO2 has resulted in plants with greater leaf area (shown in previous work), due to the production of more cells of smaller size and to lower respiration rates per unit of leaf dry mass (previous work), thus increasing light capture, reducing the loss of assimilates and increasing total plant dry matter production.

Item Type: Article
Journal or Publication Title: Journal of Experimental Botany
Uncontrolled Keywords: Genotypes ; Leaf anatomy ; Photosynthesis ; Ribulose-1,5-bisphosphate carboxylase ; Tobacco
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 76050
Deposited By: ep_importer_pure
Deposited On: 21 Oct 2015 06:04
Refereed?: Yes
Published?: Published
Last Modified: 30 Aug 2017 14:50
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/76050

Actions (login required)

View Item