Increased bundle‐sheath leakiness of CO 2 during photosynthetic induction shows a lack of coordination between the C 4 and C 3 cycles

Wang, Yu; Stutz, Samantha S.; Bernacchi, Carl J.; Boyd, Ryan A.; Ort, Donald R.; Long, Stephen P.

doi:10.1111/nph.18485

Title: Increased bundle‐sheath leakiness of CO ₂ during photosynthetic induction shows a lack of coordination between the C ₄ and C ₃ cycles

Journal Article · 29 September 2022 · New Phytologist

DOI: https://doi.org/10.1111/nph.18485 · OSTI ID:1890531

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The Carl R. Woese Institute for Genomic Biology University of Illinois Urbana‐Champaign 1206 W Gregory Dr Urbana IL 61801 USA, DOE Center for Advanced Bioenergy and Bioproducts Innovation University of Illinois at Urbana‐Champaign Urbana IL 61801 USA
The Carl R. Woese Institute for Genomic Biology University of Illinois Urbana‐Champaign 1206 W Gregory Dr Urbana IL 61801 USA
DOE Center for Advanced Bioenergy and Bioproducts Innovation University of Illinois at Urbana‐Champaign Urbana IL 61801 USA, USDA‐ARS Global Change and Photosynthesis Research Unit University of Illinois at Urbana‐Champaign Urbana IL 61801 USA, Departments of Plant Biology and Crop Sciences University of Illinois at Urbana‐Champaign Urbana IL 61801 USA
The Carl R. Woese Institute for Genomic Biology University of Illinois Urbana‐Champaign 1206 W Gregory Dr Urbana IL 61801 USA, DOE Center for Advanced Bioenergy and Bioproducts Innovation University of Illinois at Urbana‐Champaign Urbana IL 61801 USA, Departments of Plant Biology and Crop Sciences University of Illinois at Urbana‐Champaign Urbana IL 61801 USA
The Carl R. Woese Institute for Genomic Biology University of Illinois Urbana‐Champaign 1206 W Gregory Dr Urbana IL 61801 USA, DOE Center for Advanced Bioenergy and Bioproducts Innovation University of Illinois at Urbana‐Champaign Urbana IL 61801 USA, Departments of Plant Biology and Crop Sciences University of Illinois at Urbana‐Champaign Urbana IL 61801 USA, Lancaster Environment Centre Lancaster University Lancaster LA1 4YQ UK

Summary Use of a complete dynamic model of NADP‐malic enzyme C ₄ photosynthesis indicated that, during transitions from dark or shade to high light, induction of the C ₄ pathway was more rapid than that of C ₃ , resulting in a predicted transient increase in bundle‐sheath CO ₂ leakiness ( ϕ ). Previously, ϕ has been measured at steady state; here we developed a new method, coupling a tunable diode laser absorption spectroscope with a gas‐exchange system to track ϕ in sorghum and maize through the nonsteady‐state condition of photosynthetic induction. In both species, ϕ showed a transient increase to > 0.35 before declining to a steady state of 0.2 by 1500 s after illumination. Average ϕ was 60% higher than at steady state over the first 600 s of induction and 30% higher over the first 1500 s. The transient increase in ϕ , which was consistent with model prediction, indicated that capacity to assimilate CO ₂ into the C ₃ cycle in the bundle sheath failed to keep pace with the rate of dicarboxylate delivery by the C ₄ cycle. Because nonsteady‐state light conditions are the norm in field canopies, the results suggest that ϕ in these major crops in the field is significantly higher and energy conversion efficiency lower than previous measured values under steady‐state conditions.

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Research Organization:: Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0018420

OSTI ID:: 1890531

Journal Information:: New Phytologist, Journal Name: New Phytologist Journal Issue: 5 Vol. 236; ISSN 0028-646X

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
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tunable diode laser absorption spectroscopy

Title: Increased bundle‐sheath leakiness of CO 2 during photosynthetic induction shows a lack of coordination between the C 4 and C 3 cycles

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References (71)

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Title: Increased bundle‐sheath leakiness of CO ₂ during photosynthetic induction shows a lack of coordination between the C ₄ and C ₃ cycles