Can Chlorophyll a Fluorescence and Photobleaching Be a Stress Signal under Abiotic Stress in Vigna unguiculata L.?

Marcelo F. Pompelli (), Daniela Vegliante Arrieta, Yirlis Yadeth Pineda Rodríguez, Ana Melisa Jiménez Ramírez, Ana Milena Vasquez Bettin, María Angélica Quiñones Avilez, Jesús Adolfo Ayala Cárcamo, Samuel Giovanny Garcia-Castaño, Lina María Mestra González, Elias David Florez Cordero, Marvin José Perneth Montaño, Cristian Camilo Pacheco Mendoza, Anthony Ricardo Ariza González, Alberto José Tello Coley, Alfredo Jarma-Orozco and Luis Alfonso Rodriguez Paez
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Marcelo F. Pompelli: Facultad de Ciencias Agronómicas, Universidad de Córdoba, Montería 230002, Colombia
Daniela Vegliante Arrieta: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Yirlis Yadeth Pineda Rodríguez: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Ana Melisa Jiménez Ramírez: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Ana Milena Vasquez Bettin: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
María Angélica Quiñones Avilez: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Jesús Adolfo Ayala Cárcamo: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Samuel Giovanny Garcia-Castaño: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Lina María Mestra González: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Elias David Florez Cordero: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Marvin José Perneth Montaño: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Cristian Camilo Pacheco Mendoza: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Anthony Ricardo Ariza González: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Alberto José Tello Coley: Post-Graduation in Crop Science, Universidad de Córdoba, Montería 230002, Colombia
Alfredo Jarma-Orozco: Facultad de Ciencias Agronómicas, Universidad de Córdoba, Montería 230002, Colombia
Luis Alfonso Rodriguez Paez: Facultad de Ciencias Agronómicas, Universidad de Córdoba, Montería 230002, Colombia

Sustainability, 2022, vol. 14, issue 23, 1-21

Abstract: Greenhouse gas emissions continue raising the planet’s temperature by 1.5 °C since the industrial age, while the world population growth rate is 1.1%. So, studies aimed at food security and better land use are welcomed. In this paradigm, we choose Vigna unguiculata to test how it would behave in the face of severe abiotic stresses, such as drought and salt stress. This study shows that under abiotic stresses V. unguiculata tries to overcome the stress by emitting chlorophyll a fluorescence and promoting photobleaching. Thus, fewer photons are directed to photosystem I, to generate lethal reactive oxygen species. The antioxidant system showed a high activity in plants submitted to drought stress but fell in salt-stressed plants. Thus, the reductor power not dissipated by fluorescence or heat was captured and converted into hydrogen peroxide (H 2 O 2 ) which was 2.2-fold higher in salt-stressed V. unguiculata plants. Consequently, the malondialdehyde (MDA) increased in all treatment. Compiling all data, we can argue that the rapid extinguishing of chlorophyll a fluorescence, mainly in non-photochemical quenching and heat can be an indicator of stress as a first defense system, while the H 2 O 2 and MDA accumulation would be considered biochemical signals for plant defenses or plant injuries.

Keywords: osmotic stress; drought stress; waterlogging; chlorophyll a fluorescence; antioxidative enzymes; food security; global climate change (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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