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

Increased bundle‐sheath leakiness of CO2 during photosynthetic induction shows a lack of coordination between the C4 and C3 cycles

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  • Medientyp: E-Artikel
  • Titel: Increased bundle‐sheath leakiness of CO2 during photosynthetic induction shows a lack of coordination between the C4 and C3 cycles
  • Beteiligte: Wang, Yu; Stutz, Samantha S.; Bernacchi, Carl J.; Boyd, Ryan A.; Ort, Donald R.; Long, Stephen P.
  • Erschienen: Wiley, 2022
  • Erschienen in: New Phytologist
  • Sprache: Englisch
  • DOI: 10.1111/nph.18485
  • ISSN: 0028-646X; 1469-8137
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  • Beschreibung: <jats:title>Summary</jats:title><jats:p> <jats:list list-type="bullet"> <jats:list-item><jats:p>Use of a complete dynamic model of NADP‐malic enzyme C<jats:sub>4</jats:sub> photosynthesis indicated that, during transitions from dark or shade to high light, induction of the C<jats:sub>4</jats:sub> pathway was more rapid than that of C<jats:sub>3</jats:sub>, resulting in a predicted transient increase in bundle‐sheath CO<jats:sub>2</jats:sub> leakiness (<jats:italic>ϕ</jats:italic>).</jats:p></jats:list-item> <jats:list-item><jats:p>Previously, <jats:italic>ϕ</jats:italic> 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 <jats:italic>ϕ</jats:italic> in sorghum and maize through the nonsteady‐state condition of photosynthetic induction.</jats:p></jats:list-item> <jats:list-item><jats:p>In both species, <jats:italic>ϕ</jats:italic> showed a transient increase to &gt; 0.35 before declining to a steady state of 0.2 by 1500 s after illumination. Average <jats:italic>ϕ</jats:italic> was 60% higher than at steady state over the first 600 s of induction and 30% higher over the first 1500 s.</jats:p></jats:list-item> <jats:list-item><jats:p>The transient increase in <jats:italic>ϕ</jats:italic>, which was consistent with model prediction, indicated that capacity to assimilate CO<jats:sub>2</jats:sub> into the C<jats:sub>3</jats:sub> cycle in the bundle sheath failed to keep pace with the rate of dicarboxylate delivery by the C<jats:sub>4</jats:sub> cycle. Because nonsteady‐state light conditions are the norm in field canopies, the results suggest that <jats:italic>ϕ</jats:italic> in these major crops in the field is significantly higher and energy conversion efficiency lower than previous measured values under steady‐state conditions.</jats:p></jats:list-item> </jats:list> </jats:p>
  • Zugangsstatus: Freier Zugang