Impacts of the Photoinhibition of Photosystem I and its Photoprotective Mechanisms on the Photosynthetic Efficiency

• Grant number: 18/04258-6
• Support Opportunities: Regular Research Grants
• Start date: June 01, 2018
• End date: November 30, 2020
• Field of knowledge: Biological Sciences - Botany - Pant Physiology
• Principal Investigator: Milton Costa Lima Neto
• Grantee: Milton Costa Lima Neto
• Host Institution: Instituto de Biociências (IB-CLP). Universidade Estadual Paulista (UNESP). Campus Experimental do Litoral Paulista. São Vicente , SP, Brazil
• Associated scholarship(s): 19/19245-0 - Quantum efficiency and the role of NPQ as a photoprotective mechanism for higher photosynthetic efficiency, BP.TT; 19/19601-0 - P700 redox state kinetics in plants under abiotic stresses, BP.TT

Abstract

Photosynthesis is the key process for converting light energy into chemical energy, sustaining most of the planet's trophic chain. Today, agricultural systems are under tremendous pressure due to increases in world population, demand for food, scarcity of space, consumption and the need for new energy matrices. Particularly, with the current scenario of climate change, agricultural production must suffer with its efficiency and growth, especially in developing countries. Thus, the understanding of photosynthesys and photoprotective mechanisms are crucial and strategic. Several groups have studied the importance of photoinhibition of photosystem II (PSII). However, studies regarding photoinhibition of photosystem I and its photoprotective mechanisms are scarce. Therefore, this proposal has the main objective to evaluate and elucidate the role of photoinhibition of PSI, as well as its photoprotective mechanisms. As an experimental model, leaves of rice (Oryza sativa L.), physic nut (Jatropha curcas) and castor bean (Ricinus communis) with different degrees of photoinhibition of PSI will be used. Gas exchanges, chlorophyll a fluorescence, NIR absorbance, high resolution kinetics of PSI and PSII, enzymatic activities and key proteins of the electron transport chain of the chloroplast by westernblots will be evaluated. This knowledge will make possible the selection of genotypes and cultivars more tolerant to abiotic stresses, as well as better photosynthetic efficiency (AU)

Scientific publications

(8)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MOSCHETTO, FERNANDA AUGUSTO; LOPES, MARINA FAGUNDES; SILVA, BRUNO PEREIRA; LIMA NETO, MILTON COSTA. Sodium benzoate inhibits germination, establishment and development of rice plants. THEORETICAL AND EXPERIMENTAL PLANT PHYSIOLOGY, v. 31, n. 3, p. 377-385, SEP 2019. (18/04258-6)

SILVA, BRUNO PEREIRA; SABALLO, HELOISA MARIA; LOBO, ANA KARLA MOREIRA; NETO, MILTON COSTA LIMA. The plasticity of the photosynthetic apparatus and antioxidant responses are critical for the dispersion of Rhizophora mangle along a salinity gradient. Aquatic Botany, v. 185, p. 10-pg., 2023-03-01. (19/26850-7, 18/04258-6)

ZIOTTI, ANA B. S.; SILVA, BRUNO P.; SERSHEN; LIMA NETO, MILTON C.. Photorespiration is crucial for salinity acclimation in castor bean. ENVIRONMENTAL AND EXPERIMENTAL BOTANY, v. 167, NOV 2019. (18/04258-6, 18/06366-0)

SOUZA, NAIARA CELIDA S.; SILVEIRA, JOAQUIM ALBENISIO G.; SILVA, EVANDRO NASCIMENTO; LIMA NETO, MILTON COSTA; LIMA, CRISTINA SILVA; ARAGAO, RAFAEL MAGALHAES; FERREIRA-SILVA, SERGIO LUIZ. High CO2 favors ionic homeostasis, photoprotection, and lower photorespiration in salt-stressed cashew plants. ACTA PHYSIOLOGIAE PLANTARUM, v. 41, n. 9, AUG 8 2019. (18/04258-6)

NETO, MILTON C. LIMA; CARVALHO, FABRICIO E. L.; SOUZA, GUSTAVO M.; SILVEIRA, JOAQUIM A. G.. Understanding photosynthesis in a spatial-temporal multiscale: The need for a systemic view. THEORETICAL AND EXPERIMENTAL PLANT PHYSIOLOGY, v. 33, n. 2, p. 113-124, JUN 2021. (18/04258-6)

CERQUEIRA, JOAO V. A.; SILVEIRA, JOAQUIM A. G.; CARVALHO, FABRICIO E. L.; CUNHA, JULIANA R.; LIMA NETO, MILTON C.. The regulation of P700 is an important photoprotective mechanism to NaCl-salinity in Jatropha curcas. PHYSIOLOGIA PLANTARUM, v. 167, n. 3, p. 404-417, NOV 2019. (18/04258-6)

ZWAR, INGRID P.; TROTTA, CATERINA DO VALLE; ZIOTTI, ANA B. S.; NETO, MILTON LIMA; ARAUJO, WELINGTON L.; DE MELO, ITAMAR S.; OTTONI, CRISTIANE A.; DE SOUZA, ANA O.. Biosynthesis of silver nanoparticles using actinomycetes, phytotoxicity on rice seeds, and potential application in the biocontrol of phytopathogens. JOURNAL OF BASIC MICROBIOLOGY, v. 63, n. 1, p. 11-pg., 2022-11-06. (18/04258-6, 20/12867-2)

CALZADILLA, P. I.; CARVALHO, F. E. L.; GOMEZ, R.; NETO, M. C. LIMA; SIGNORELLI, S.. Assessing photosynthesis in plant systems: A cornerstone to aid in the selection of resistant and productive crops. ENVIRONMENTAL AND EXPERIMENTAL BOTANY, v. 201, p. 19-pg., 2022-09-01. (18/04258-6)