Abstract
Significant linear relationships between photosynthetic capacity and principal components loaded by phloem cell numbers and tracheary elements per minor vein as well as the latter two normalized for vein density (proxy for apoplastic phloem loading capacity involving membrane transporters) were revealed for all apoplastic loaders (summer annuals and winter annual Arabidopsis thaliana). In addition, significant linear relationships between photosynthetic capacity and a principal component loaded by tracheary element cross-sectional areas and volumes per unit of leaf area (water flux capacity proxy) was present for symplastic and apoplastic loaders. Lastly, a significant linear relationship between photosynthetic capacity and a principal component loaded by phloem cell cross-sectional areas and volumes per unit of leaf area (proxy for symplastic loading capacity involving cytosolic enzymes for companion cells) was revealed for summer annual symplastic loaders as well as for A. thaliana (in the case of sieve elements, a proxy for sugar export capacity from the leaves).
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Abbreviations
- CC:
-
companion cell
- LC:
-
loading cell (i.e., CC and PPC)
- PC:
-
principal component
- PCA:
-
principal component analysis
- PPC:
-
phloem parenchyma cell
- SA:
-
summer annual
- SE:
-
sieve element
- TE:
-
tracheary element
- VD:
-
vein density
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Acknowledgements: We thank Profs. Doug Schemske and Jon Ågren for providing seed of the Italian and Swedish ecotypes of A. thaliana, the USDA GRIN for providing seed of the wild H. annuus, Drs. Christopher Cohu and Onno Muller for data collection, and Dr. Stacey Smith, Dr. Samuel Flaxman, and Mr. Blake Stevison for valuable discussion. This work was supported by the National Science Foundation (Award Number DEB-1022236 to BD-A and WWA) and the University of Colorado at Boulder.
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Polutchko, S.K., Stewart, J.J., Demmig-Adams, B. et al. Evaluating the link between photosynthetic capacity and leaf vascular organization with principal component analysis. Photosynthetica 56, 392–403 (2018). https://doi.org/10.1007/s11099-017-0764-6
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DOI: https://doi.org/10.1007/s11099-017-0764-6