Non-photochemical quenching (NPQ) is a complex and still unclear mechanism essential for higher plants. The intensive research on this subject has highlighted three main components of NPQ: energy-dependent process (qE); state transitions to balance the excitation of PSII and PSI (qT); and photoinhibitory processes (qI). Recently, these components have been resolved as quantum yields according to the energy partitioning approach that takes into account the rate constants of every process involved in the quenching mechanisms of excited chlorophylls. In this study a fully extended quantum yield approach and the introduction of novel equations to assess the yields of each NPQ component are presented. Furthermore, a complete analysis of the yield of NPQ in Beta vulgaris exposed to different irradiances has been carried out. In agreement with experimental results here it is shown that the previous approach may amplify the yield of qE component and flatten the quantitative results of fluorescence analysis. Moreover, the significance of taking into account the physiological variability of NPQ for a correct assessment of energy partitioning is demonstrated

A revised energy partitioning approach to assess the yields of non-photochemical quenching components / Guadagno, CARMELA ROSARIA; Virzo, Amalia; D'Ambrosio, Nicola. - In: BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS. - ISSN 0005-2728. - STAMPA. - 1797:5(2010), pp. 525-530. [10.1016/j.bbabio.2010.01.016]

A revised energy partitioning approach to assess the yields of non-photochemical quenching components

GUADAGNO, CARMELA ROSARIA;VIRZO, AMALIA;D'AMBROSIO, NICOLA
2010

Abstract

Non-photochemical quenching (NPQ) is a complex and still unclear mechanism essential for higher plants. The intensive research on this subject has highlighted three main components of NPQ: energy-dependent process (qE); state transitions to balance the excitation of PSII and PSI (qT); and photoinhibitory processes (qI). Recently, these components have been resolved as quantum yields according to the energy partitioning approach that takes into account the rate constants of every process involved in the quenching mechanisms of excited chlorophylls. In this study a fully extended quantum yield approach and the introduction of novel equations to assess the yields of each NPQ component are presented. Furthermore, a complete analysis of the yield of NPQ in Beta vulgaris exposed to different irradiances has been carried out. In agreement with experimental results here it is shown that the previous approach may amplify the yield of qE component and flatten the quantitative results of fluorescence analysis. Moreover, the significance of taking into account the physiological variability of NPQ for a correct assessment of energy partitioning is demonstrated
2010
A revised energy partitioning approach to assess the yields of non-photochemical quenching components / Guadagno, CARMELA ROSARIA; Virzo, Amalia; D'Ambrosio, Nicola. - In: BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS. - ISSN 0005-2728. - STAMPA. - 1797:5(2010), pp. 525-530. [10.1016/j.bbabio.2010.01.016]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/366339
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