Title: Granal thylakoid structure and function: explaining an enduring mystery of higher plants

Journal Article · · New Phytologist
DOI: https://doi.org/10.1111/nph.18371 · OSTI ID:1879566
ORCiD logo [1];  [2]; ORCiD logo [3];  [2]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [3]
  1. Environmental Sciences Division and Climate Change Science Institute Oak Ridge National Laboratory Oak Ridge TN 37831 USA
  2. Department of Plant Agriculture University of Guelph Guelph ON N1G 2W1 Canada
  3. School of Integrative Plant Science Cornell University Ithaca NY 14853 USA
  4. School of Biology and Ecology University of Maine Orono ME 04469 USA
  5. Department of Hydrology and Atmospheric Sciences University of Arizona Tucson AZ 85721 USA

Summary In higher plants, photosystems II and I are found in grana stacks and unstacked stroma lamellae, respectively. To connect them, electron carriers negotiate tortuous multi‐media paths and are subject to macromolecular blocking. Why does evolution select an apparently unnecessary, inefficient bipartition? Here we systematically explain this perplexing phenomenon. We propose that grana stacks, acting like bellows in accordions, increase the degree of ultrastructural control on photosynthesis through thylakoid swelling/shrinking induced by osmotic water fluxes. This control coordinates with variations in stomatal conductance and the turgor of guard cells, which act like an accordion's air button. Thylakoid ultrastructural dynamics regulate macromolecular blocking/collision probability, direct diffusional pathlengths, division of function of Cytochrome  b 6 f complex between linear and cyclic electron transport, luminal pH via osmotic water fluxes, and the separation of pH dynamics between granal and lamellar lumens in response to environmental variations. With the two functionally asymmetrical photosystems located distantly from each other, the ultrastructural control, nonphotochemical quenching, and carbon‐reaction feedbacks maximally cooperate to balance electron transport with gas exchange, provide homeostasis in fluctuating light environments, and protect photosystems in drought. Grana stacks represent a dry/high irradiance adaptation of photosynthetic machinery to improve fitness in challenging land environments. Our theory unifies many well‐known but seemingly unconnected phenomena of thylakoid structure and function in higher plants.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Cornell Initiative for Digital Agriculture Research Innovation; National Science Foundation; Ontario Ministry of Agriculture, Food and Rural Affairs; USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER); United States Department of Agriculture
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1879566
Journal Information:
New Phytologist, Journal Name: New Phytologist Journal Issue: 2 Vol. 236; ISSN 0028-646X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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  • Badger, Murray R.; von Caemmerer, Susanne; Ruuska, Sari
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