Energy-dependent quenching adjusts the excitation diffusion length to regulate photosynthetic light harvesting

Proceedings of the National Academy of Sciences of the United States of America
Doran I G BennettKapil Amarnath

Abstract

An important determinant of crop yields is the regulation of photosystem II (PSII) light harvesting by energy-dependent quenching (qE). However, the molecular details of excitation quenching have not been quantitatively connected to the fraction of excitations converted to chemical energy by PSII reaction centers (PSII yield), which determines flux to downstream metabolism. Here, we incorporate excitation dissipation by qE into a pigment-scale model of excitation transfer and trapping for a 200 × 200-nm patch of the grana membrane. We show that excitation transport can be rigorously coarse grained to a 2D random walk with an excitation diffusion length determined by the extent of quenching. We present an alternative method for analyzing pulse amplitude-modulated chlorophyll fluorescence measurements that incorporates the effects of a variable excitation diffusion length during qE activation.

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Citations

Jun 24, 2020·Emerging Topics in Life Sciences·Thomas D Sharkey
Feb 28, 2019·Proceedings of the National Academy of Sciences of the United States of America·Soomin ParkGraham R Fleming
Jul 22, 2019·The Journal of Chemical Physics·Arend G Dijkstra, Almut Beige
Oct 28, 2019·The Biochemical Journal·Petar H Lambrev, Parveen Akhtar
Feb 6, 2019·The New Phytologist·Helmut Kirchhoff
Jun 18, 2021·Physical Review. E·Jean-Christian Anglès d'Auriac, Ferenc Iglói
Dec 23, 2021·Science Advances·Wojciech J NawrockiRoberta Croce

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Methods Mentioned

BETA
light harvesting
Fluorescence

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