In vivo temperature limitations of photosynthesis in Phaseolus vulgaris L |
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| Affiliation: | 1. Departamento de Fitotecnia, Instituto de Agronomia, Universidade Federal Rural do Rio de Janeiro, CEP 23851-970, Seropédica, RJ, Brazil;2. Laboratório de Fisiologia Vegetal “Coaracy M. Franco”, CP 28, Instituto Agronômico (IAC), CEP 13020-902, Campinas, SP, Brazil;3. Departamento de Botânica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil;4. Departamento de Ciências Biológicas, CP 09, Escola Superior de Agricultura Luiz de Queiroz-USP, CEP 13419-110, Piracicaba, SP, Brazil;1. Department of Agricultural Botany, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra 444 104, India;2. Plant Stress Physiology and Biotechnology Section, Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra 450 085, India;1. Programa de Pós-Graduação em Ciências Biológicas (Biologia Vegetal), Universidade Estadual Paulista, UNESP, Instituto de Biociências, Departamento de Botânica, Av. 24-A, 1515, 13506-900, Rio Claro, SP, Brazil;2. Centro de P&D de Sanidade Vegetal, Laboratório de Bioquímica Fitopatológica, Instituto Biológico, Av. Conselheiro R. Alves, 1252, 04014-002, São Paulo, SP, Brazil;3. Instituto de Ciências Biológicas, Universidade de Brasília, UnB, Campus Universitário Darcy Ribeiro, Asa Norte, 70910-900, Brasília, DF, Brazil;4. Departamento de Ciência Florestal, Universidade Estadual Paulista, UNESP, Faculdade de Ciências Agronômicas, C.P. 237, 18603-970, Botucatu, SP, Brazil;5. Departamento de Botânica, Universidade Estadual Paulista, UNESP, Instituto de Biociências, C.P. 510, 18618-970, Botucatu, SP, Brazil;6. Department of Plant Biology, Institute of Biology, P.O. Box: 6109, University of Campinas – UNICAMP, 13083-970, Campinas, SP, Brazil;7. Departamento de Botânica, Universidade Estadual Paulista, UNESP, Instituto de Biociências, Av. 24-A, 1515, 13506-900, Rio Claro, SP, Brazil;1. Department of Biological Sciences, University of Lethbridge, University Drive 4401, Lethbridge, AB, Canada T1K3M4;2. Laboratory for Foodborne Zoonoses, Public Health Agency of Canada, Animal Diseases Research Institute, Lethbridge, Alberta, Canada;1. Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan;2. Department of Advanced Transplant and Regenerative Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan;3. Hirosaki University Graduate School of Medicine, Hirosaki, Japan;1. Mohammed VI Polytechnic University, School of Science of Agriculture, Fertilizing and Environment, Ben Guerir, Morocco;2. Bioenergetics and Microbiology laboratory, University of Geneva, CH-1254 Jussy-Geneva, Switzerland;3. Department of Biophysics and Radiobiology, Faculty of Biology, St. Kliment Ohridski University of Sofia, Sofia, Bulgaria |
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| Abstract: | The purpose of this study was to evaluate the temperature response of photosynthesis in two common bean genotypes differing in crop yield when grown under warm conditions. The cultivar Nobre is sensitive to high temperatures, whereas Diplomata shows better crop yield under high temperatures. Plants were grown in a greenhouse prior to transferring to a controlled environment cabinet for the temperature treatments. In a first experiment, 30 days-old plants were subjected to a short exposure (1 day) at temperatures that varied from 9 °C to 39 °C. Diplomata had lower net CO2 assimilation rate (A) at 15 °C and 21 °C, but higher from 27 °C to 39 °C. Photosynthetic parameters calculated from modeling the response of A to the intercellular CO2 concentration suggested that the different temperature responses of the two genotypes are caused by different rates of diffusion of CO2 to the assimilation site, not by differences in biochemical limitations of photosynthesis. While stomatal conductance (gs) did not differ between the genotypes, mesophyll conductance (gm) was slightly greater for Nobre at 15 °C, but much higher in Diplomata from 21 °C to 39 °C. In a second experiment, no difference was observed in biomass accumulation between the two genotypes after growth for 24 days under a 35/20 °C (day/night) regime. Hence, the differences in photosynthesis did not cause variation in plant growth at the vegetative stage. The differential genotypic response of gm to temperature suggests that gm might be an important limitation to photosynthesis in Nobre, the common bean genotype sensitive to elevated temperature. However, more studies are needed employing other methods for gm evaluation to validate these results. |
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| Keywords: | Day respiration rate Maximum carboxylation rate Maximum electron transport rate Mesophyll conductance |
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