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Title: Cell wall properties in Oryza sativa influence mesophyll CO 2 conductance

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.15173· OSTI ID:1434177
 [1];  [1];  [2];  [1]
  1. School of Biological Sciences Washington State University Pullman WA 99164‐4236 USA
  2. School of Biological Sciences Washington State University Pullman WA 99164‐4236 USA, Laboratory of Anatomy and Morphology V.L. Komarov Botanical Institute of the Russian Academy of Sciences St Petersburg 197376 Russia

Summary Diffusion of CO 2 from the leaf intercellular air space to the site of carboxylation ( g m ) is a potential trait for increasing net rates of CO 2 assimilation ( A net ), photosynthetic efficiency, and crop productivity. Leaf anatomy plays a key role in this process; however, there are few investigations into how cell wall properties impact g m and A net . Online carbon isotope discrimination was used to determine g m and A net in Oryza sativa wild‐type ( WT ) plants and mutants with disruptions in cell wall mixed‐linkage glucan ( MLG ) production ( CslF6 knockouts) under high‐ and low‐light growth conditions. Cell wall thickness ( T cw ), surface area of chloroplast exposed to intercellular air spaces ( S c ), leaf dry mass per area ( LMA ), effective porosity, and other leaf anatomical traits were also analyzed. The g m of CslF6 mutants decreased by 83% relative to the WT , with c . 28% of the reduction in g m explained by S c . Although A net / LMA and A net /Chl partially explained differences in A net between genotypes, the change in cell wall properties influenced the diffusivity and availability of CO 2 . The data presented here indicate that the loss of MLG in CslF6 plants had an impact on g m and demonstrate the importance of cell wall effective porosity and liquid path length on g m .

Sponsoring Organization:
USDOE
OSTI ID:
1434177
Journal Information:
New Phytologist, Journal Name: New Phytologist Vol. 219 Journal Issue: 1; ISSN 0028-646X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 63 works
Citation information provided by
Web of Science

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