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Structural and functional leaf diversity lead to variability in photosynthetic capacity across a range of Juglans regia genotypes
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  • Mina Momayyezi,
  • Devin Rippner,
  • Fiona Duong,
  • Pranav Raja,
  • Pat Brown,
  • Dan Kluepfel,
  • Jeffrey Earles,
  • Elisabeth Forrestel,
  • Matthew Gilbert,
  • Andrew McElrone
Mina Momayyezi
UC Davis

Corresponding Author:[email protected]

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Devin Rippner
US Department of Agriculture
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Fiona Duong
University of California Davis
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Pranav Raja
University of California Davis
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Pat Brown
University of California, Davis
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Dan Kluepfel
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Jeffrey Earles
University of California Davis
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Elisabeth Forrestel
University of California Davis
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Matthew Gilbert
University of California Davis
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Andrew McElrone
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Similar to other cropping systems, few walnut cultivars are used as scion in commercial production. Germplasm collections can be used to diversify cultivar options and hold potential for improving crop productivity, disease resistance and stress tolerance. In this study we explored the anatomical and biochemical bases of photosynthetic capacity in 11 J. regia accessions in the USDA-ARS National Clonal Germplasm Repository. Net assimilation rate (An) differed significantly among accessions and was greater in those from lower latitudes coincident with increases in stomatal and mesophyll conductance, leaf thickness, mesophyll porosity and gas-phase diffusion, and leaf nitrogen, and lower leaf mass and stomatal density. High CO2-saturated assimilation rates led to increases in An under limiting conditions. Greater An was found in lower latitude accessions native to climates with more frost-free days, greater precipitation seasonality, and lower temperature seasonality. As expected, water stress consistently impaired photosynthesis with the highest % reductions in three lower latitude accessions (A3, A5, and A9), which had the highest An under well-watered conditions. However, An for A3 and A5 remained amongst the highest under dehydration. J. regia accessions, which have leaf structural traits and biochemistry that enhance photosynthesis, could be used as commercial scions or breeding parents to enhance productivity.
01 Oct 2021Submitted to Plant, Cell & Environment
04 Oct 2021Submission Checks Completed
04 Oct 2021Assigned to Editor
10 Oct 2021Reviewer(s) Assigned
12 Feb 2022Review(s) Completed, Editorial Evaluation Pending
27 Feb 2022Editorial Decision: Revise Minor
18 Apr 20221st Revision Received
20 Apr 2022Assigned to Editor
20 Apr 2022Submission Checks Completed
23 Apr 2022Reviewer(s) Assigned
05 May 2022Review(s) Completed, Editorial Evaluation Pending
08 May 2022Editorial Decision: Revise Minor
17 May 20222nd Revision Received
18 May 2022Assigned to Editor
18 May 2022Submission Checks Completed
28 May 2022Review(s) Completed, Editorial Evaluation Pending
28 May 2022Editorial Decision: Accept
Aug 2022Published in Plant, Cell & Environment volume 45 issue 8 on pages 2351-2365. 10.1111/pce.14370