Chlorophyll can be reduced in crop canopies with little penalty to photosynthesis

dc.contributor.author Walker, Berkley
dc.contributor.author Drewry, Darren
dc.contributor.author VanLoocke, Andy
dc.contributor.author Slattery, Rebecca
dc.contributor.author VanLoocke, Andy
dc.contributor.author Cho, Young
dc.contributor.author Ort, Donald
dc.contributor.department Agronomy
dc.date 2018-01-26T08:18:24.000
dc.date.accessioned 2020-06-29T23:04:57Z
dc.date.available 2020-06-29T23:04:57Z
dc.date.issued 2017-10-01
dc.description.abstract <p>The hypothesis that reducing chlorophyll content (Chl) can increase canopy photosynthesis in soybeans was tested using an advanced model of canopy photosynthesis. The relationship between leaf Chl, leaf optical properties, and photosynthetic biochemical capacity were measured in 67 soybean accessions showing large variation in leaf Chl. These relationships were integrated into a biophysical model of canopy-scale photosynthesis to simulate the intercanopy light environment and carbon assimilation capacity of canopies with WT, a Chl-deficient mutant (Y11y11), and 67 other mutants spanning the extremes of Chl to quantify the impact of variation in leaf-level Chl on canopy-scale photosynthetic assimilation and identify possible opportunities for improving canopy photosynthesis through Chl reduction. These simulations demonstrate that canopy photosynthesis should not increase with Chl reduction due to increases in leaf reflectance and non-optimal distribution of canopy nitrogen. However, similar rates of canopy photosynthesis can be maintained with a 9% savings in leaf nitrogen resulting from decreased Chl. Additionally, analysis of these simulations indicate that the inability of Chl reductions to increase photosynthesis arises primarily from the connection between Chl and leaf reflectance and secondarily from the mismatch between the vertical distribution of leaf nitrogen and the light absorption profile. These simulations suggest that future work should explore the possibility of using reduced Chl to improve canopy performance by adapting the distribution of the "saved" nitrogen within the canopy to take greater advantage of the more deeply penetrating light.</p>
dc.description.comments <p>This is a manuscript of an article published as Walker, Berkley J., Darren T. Drewry, Rebecca A. Slattery, Andy VanLoocke, Young B. Cho, and Donald R. Ort. "Chlorophyll can be reduced in crop canopies with little penalty to photosynthesis." <em>Plant physiology</em> (2017). doi: <a href="https://doi.org/10.1104/pp.17.01401">10.1104/pp.17.01401</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/407/
dc.identifier.articleid 1459
dc.identifier.contextkey 11423619
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/407
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4762
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/407/2017_VanLoocke_ChlorophyllReducedManuscript.pdf|||Sat Jan 15 00:08:41 UTC 2022
dc.source.uri 10.1104/pp.17.01401
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Plant Biology
dc.subject.disciplines Plant Breeding and Genetics
dc.title Chlorophyll can be reduced in crop canopies with little penalty to photosynthesis
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication b88ab303-e9ba-4ac1-ba87-5ae642e91270
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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