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Głowacka, Katarzyna; Kromdijk, Johannes; Salesse‐Smith, Coralie E.; Smith, Cailin; Driever, Steven M.; Long, Stephen P.

Is chloroplast size optimal for photosynthetic efficiency?

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  • Media type: E-Article
  • Title: Is chloroplast size optimal for photosynthetic efficiency?
  • Contributor: Głowacka, Katarzyna; Kromdijk, Johannes; Salesse‐Smith, Coralie E.; Smith, Cailin; Driever, Steven M.; Long, Stephen P.
  • imprint: Wiley, 2023
  • Published in: New Phytologist
  • Language: English
  • DOI: 10.1111/nph.19091
  • ISSN: 0028-646X; 1469-8137
  • Origination:
  • Footnote:
  • Description: <jats:title>Summary</jats:title><jats:p><jats:list list-type="bullet"> <jats:list-item><jats:p>Improving photosynthetic efficiency has recently emerged as a promising way to increase crop production in a sustainable manner. While chloroplast size may affect photosynthetic efficiency in several ways, we aimed to explore whether chloroplast size manipulation can be a viable approach to improving photosynthetic performance.</jats:p></jats:list-item> <jats:list-item><jats:p>Several tobacco (<jats:italic>Nicotiana tabacum</jats:italic>) lines with contrasting chloroplast sizes were generated via manipulation of chloroplast division genes to assess photosynthetic performance under steady‐state and fluctuating light. A selection of lines was included in a field trial to explore productivity.</jats:p></jats:list-item> <jats:list-item><jats:p>Lines with enlarged chloroplasts underperformed in most of the measured traits. Lines with smaller and more numerous chloroplasts showed a similar efficiency compared with wild‐type (WT) tobacco. Chloroplast size only weakly affected light absorptance and light profiles within the leaf. Increasing chloroplast size decreased mesophyll conductance (<jats:italic>g</jats:italic><jats:sub>m</jats:sub>) but decreased chloroplast size did not increase <jats:italic>g</jats:italic><jats:sub>m</jats:sub>. Increasing chloroplast size reduced chloroplast movements and enhanced non‐photochemical quenching. The chloroplast smaller than WT appeared to be no better than WT for photosynthetic efficiency and productivity under field conditions.</jats:p></jats:list-item> <jats:list-item><jats:p>The results indicate that chloroplast size manipulations are therefore unlikely to lead to higher photosynthetic efficiency or growth.</jats:p></jats:list-item> </jats:list></jats:p>