Energy dissipation and photosynthetic electron flow during the transition from juvenile red to mature green leaves in mango (<i>Mangifera indica</i> L.)

Gupta, Ramwant; Sharma, Ravi Kumar; Singh, Munna

doi:10.1080/11263504.2020.1810807

Cited by 8 publications

(3 citation statements)

References 46 publications

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“…65 During this inactivation of PSII reaction centers, damage to the OEC and/or decreased turnover of D1 protein observed in many plants. 3,16,30,66,67 The balance between optimal utility of light and thermal dissipation during high light intensity is of key impedance for plants. 68 Also, high light produces ROS, which inhibits the repair of PSII mainly through suppressing the de novo synthesis of proteins, 69 thus damaging the photochemical reaction center of PSII, the OEC in particular.…”

Section: High Light Intensitymentioning

confidence: 99%

“…14,15 These phases of fluorescence induction are linked with different energy fluxes, starts from light absorption (ABS), trapping (TR), dissipation (D1), electron transport (ET), and ends with the electron acceptor side at the PSI (RE). 15,16 Some additional parameters viz., the quantum yields of primary PSII photochemistry (φPo), electron transport from Q A to PQ (ψEo), and electron transport from Q A to final PSI acceptor (φRo) and the overall performance indices are characterized by O-J-I-P transients (Figure 1). 15,17,18 Various attempts have made to understand the impact of different abiotic stresses, i.e., high and low temperature, salinity, droughts, highintensity light, on the photosynthetic apparatus of the plants.…”

Section: Introductionmentioning

confidence: 99%

“…15,17,18 Various attempts have made to understand the impact of different abiotic stresses, i.e., high and low temperature, salinity, droughts, highintensity light, on the photosynthetic apparatus of the plants. 3,7,16,19,20 Many workers reviewed the structure and function of PSII under abiotic stresses; however, progress in understanding the structure and function of mysterious super catalyst, i.e., OEC of PSII is faraway. The present review aims to summarise the structural and functional cohesion of the oxygen-evolving complex in response to various abiotic stresses.…”

Section: Introductionmentioning

confidence: 99%

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The oxygen-evolving complex: a super catalyst for life on earth, in response to abiotic stresses

Gupta

2020

Plant Signaling & Behavior

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The oxygen-evolving complex is integrated into photosystem (PSII). An essential part of oxygenic photosynthetic apparatus, embedded in the thylakoid membrane of chloroplasts. The OEC is a super catalyst to split water into molecular oxygen in the presence of light. The OEC consist of four Mn atoms, one Ca atom and five oxygen atoms (CaMn 4 O 5 ) and this cluster is maintained by its surrounding proteins viz., PsbQ, PsbP, PsbO, PsbR. The function of this super catalyst with a high turnover frequency of 500 s −1 in standard condition. Chlorophyll a fluorescence (OJIP transients) are used to understand structural and functional cohesion of photosynthetic apparatus. A further K-peak in OJIP curve reflects damage at the OEC donor site in response to salinity, drought, and high temperature. The decline in performance indices (PI, SFI) also revealed structural damage of photosynthetic apparatus that leads to disruption of electron transport rate under abiotic conditions. This review discusses the structural and function cohesion of the OEC in plant against variable abiotic conditions.

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