Chloroplast ATP synthase restricts photosynthesis under fluctuating light in tomato but not in maize.

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  • Additional Information
    • Source:
      Publisher: Elsevier Science Country of Publication: France NLM ID: 9882449 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-2690 (Electronic) Linking ISSN: 09819428 NLM ISO Abbreviation: Plant Physiol Biochem Subsets: MEDLINE
    • Publication Information:
      Publication: Amsterdam : Elsevier Science
      Original Publication: Paris : Gauthier-Villars, c1987-
    • Subject Terms:
      Zea mays*/enzymology ; Zea mays*/metabolism ; Zea mays*/radiation effects ; Zea mays*/physiology ; Solanum lycopersicum*/enzymology ; Solanum lycopersicum*/metabolism ; Solanum lycopersicum*/physiology ; Solanum lycopersicum*/radiation effects ; Photosynthesis*/physiology ; Chloroplast Proton-Translocating ATPases*/metabolism ; Light*; Chloroplasts/metabolism ; Chloroplasts/enzymology ; Plant Leaves/metabolism ; Plant Leaves/enzymology ; Plant Leaves/radiation effects ; Plant Leaves/physiology
    • Abstract:
      Photosynthesis in fluctuating light requires coordinated adjustments of diffusion conductance and biochemical capacity, but the role of chloroplast ATP synthase activity (g H + ) in dynamic photosynthesis is not well understood. In this study, we measured gas exchange, chlorophyll fluorescence and electrochromic shift signals in fluctuating light for leaves of tomato (Solanum lycopersicum) and maize (Zea mays). During the transition from sun to shade, simultaneous increases in g H + , effective quantum yield of PSII, and net CO 2 assimilation rate (A N ) occurred in tomato but uncoupled in maize, indicating that g H   +  limited A N during the sun-to-shade transition in tomato but not in maize. During the shade-to-sun transition, g H   +  increased simultaneously with stomatal conductance, mesophyll conductance and Rubisco carboxylation capacity in tomato, suggesting that g H + is an overlooked factor affecting light induction of A N in tomato. By comparison, g H   +  maintained at high levels in maize and its A N was mainly restricted by stomatal conductance. Our results reveal that the kinetics of g H + in fluctuating light differs between species, and chloroplast ATP synthase may be a potential target for improving dynamic photosynthesis in crops such as tomato.
      Competing Interests: Declaration of competing interest The authors declare no conflict of interest.
      (Copyright © 2024 Elsevier Masson SAS. All rights reserved.)
    • Contributed Indexing:
      Keywords: Chloroplast ATP synthase; Diffusion conductance; Fluctuating light; Photosynthesis
    • Accession Number:
      EC 3.6.3.- (Chloroplast Proton-Translocating ATPases)
    • Publication Date:
      Date Created: 20240911 Date Completed: 20241107 Latest Revision: 20241107
    • Publication Date:
      20241107
    • Accession Number:
      10.1016/j.plaphy.2024.109115
    • Accession Number:
      39260262