Maintenance of a high photosynthetic performance is linked to flooding tolerance in citrus |
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| Authors: | Vicent Arbona María F López-Climent Rosa M Pérez-Clemente Aurelio Gómez-Cadenas |
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| Institution: | 1. Agronomic Institute (IAC), Center for Research and Development in Ecophysiology and Biophysics, Laboratory of Plant Physiology ‘Coaracy M. Franco’, P.O. Box 28, 13012-970 Campinas, SP, Brazil;2. University of Campinas (UNICAMP), Institute of Biology, Department of Plant Biology, CP6109, 13083-970 Campinas, SP, Brazil;1. Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture/Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, P.R. China;2. College of Resources and Environment, South China Agricultural University, Guangzhou 510642, P.R. China;1. Plant Pathology Department, Citrus Research and Education Center, IFAS, University of Florida, Lake Alfred, Florida, USA;2. Department of Agricultural Botany, Faculty of Agriculture, Tanta University, Tanta, Egypt;1. Institute of Horticultural Plants, College of Horticulture, China Agricultural University, Beijing 100193, PR China;2. Key Laboratory of Stress Physiology and Molecular Biology for Fruit Trees in Beijing Municipality, China Agricultural University, Beijing 100193, PR China;3. Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Nutrition and Physiology), Ministry of Agriculture, China Agricultural University, Beijing 100193, PR China;1. Dipartimento di Coltivazioni e Difesa delle Specie Legnose ‘G. Scaramuzzi’, Università di Pisa, I-56124 Pisa, Italy;2. Dipartimento di Scienze e Tecnologie per l’Agricoltura, le Foreste, la Natura e l’Energia, Via S. C. DeLellis s.n.c, Università della Tuscia, Viterbo 01100, Italy;1. University of Florida, IFAS, Citrus Research and Education Center, Lake Alfred, FL 33850, USA;2. CEBAS, CSIC, Murcia, Spain |
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| Abstract: | Citrus trees have been considered as flooding-sensitive although important differences in tolerance among species have been reported. The tolerance to flooding has been linked to optimal photosynthetic performance in other woody plants. To test whether there was a relationship between photosynthetic performance and flooding tolerance, leaf damage, chlorophyll content, net photosynthetic rate, stomatal conductance, the ratio of internal to ambient CO2 concentration (Ci/Ca), water use efficiency and chlorophyll fluorescence parameters were studied in leaves of three citrus genotypes differing in their tolerance to flooding during continuous substrate flooding and alternate cycles of flooding and recovery. In Cleopatra and Citrumelo genotypes, marked reductions in net photosynthetic rate and stomatal conductance as well as increases in Ci/Ca in response to flooding stress were observed although with differences in the magnitude of the variation. In contrast, in Carrizo, a relatively flooding-tolerant genotype, there were no changes in net photosynthetic rate or in Ci/Ca and only a slight decrease in stomatal conductance occurred in response to flooding. Significant correlation between net photosynthetic rate and chlorophyll fluorescence parameters during flooding indicated a biochemical impairment of photosynthetic activity. This effect was apparently linked to damage in the PSII light-harvesting complexes induced by flooding and a subsequent effect on PSII to PSI electron flow that may alter the redox status in cells. Such biochemical impairment could lead to an increase in oxidative damage in Cleopatra and Citrumelo. The maintenance of good photosynthetic performance together with mechanisms to adjust electron flow in the photosynthetic apparatus could be linked to flooding tolerance in these woody plants. |
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