The Major Veins of Mesomorphic Leaves Revisited: Tests for Conductive Overload in Acer saccharum (Aceraceae) and Quercus rubra (Fagaceae)

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The Major Veins of Mesomorphic Leaves Revisited: Tests for Conductive Overload in Acer saccharum (Aceraceae) and Quercus rubra (Fagaceae)

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dc.contributor.author Holbrook, Noel
dc.contributor.author Cowan, Peter D.
dc.contributor.author Sack, Lawren
dc.date.accessioned 2011-01-25T20:09:18Z
dc.date.issued 2003
dc.identifier.citation Sack, Lawren, Peter D. Cowan, and Noel Michelle Holbrook. 2003. The major veins of mesomorphic leaves revisited: Tests for conductive overload in Acer saccharum (Aceraceae) and Quercus rubra (Fagaceae). American Journal of Botany 90(1): 32-39. en_US
dc.identifier.issn 1537-2197 en_US
dc.identifier.issn 0002-9122 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:4686756
dc.description.abstract Many leaves survive the severing of their major veins in apparently excellent health. According to the classical explanation, the leaf minor veins provide "conductive overload," an excess of parallel conductive paths, rendering the major veins hydraulically dispensable. Whether such an excess of conductive paths exists has important implications for vascular design and for leaf response to vascular damage. We subjected leaves of Acer saccharum and Quercus rubra to cutting treatments that disrupted the major vein system and determined leaf survival, stomatal conductance (g), quantum yield of photosystem II (Phi(PSII)), and leaf hydraulic conductance (K-leaf). For A. saccharum, the cuts led to the death of distal lamina. For Q. rubra, however, the treated leaves typically remained apparently healthy. Despite their appearance, the treated Q. rubra leaves had a strongly reduced K-leaf,K- relative to control leaves, and g and Phi(PSII) were reduced distal to the cuts, respectively, by 75-97% and 48-76%. Gas exchange proximal to the cuts was unaffected, indicating the independence of lamina regions and their local stomata. Analogous results were obtained with excised Q. rubra leaves. These studies demonstrate an indispensable, vital role of the major veins in conducting water throughout the lamina. en_US
dc.description.sponsorship Organismic and Evolutionary Biology en_US
dc.language.iso en_US en_US
dc.publisher Botanical Society of America en_US
dc.relation.isversionof http://dx.doi.org/10.3732/ajb.90.1.32 en_US
dash.license LAA
dc.subject vascular architecture en_US
dc.subject temperate forest en_US
dc.subject stomatal conductance en_US
dc.subject leaf hydraulic conductance en_US
dc.subject hydraulic architecture en_US
dc.subject herbivory en_US
dc.subject drought response en_US
dc.subject biological networks en_US
dc.title The Major Veins of Mesomorphic Leaves Revisited: Tests for Conductive Overload in Acer saccharum (Aceraceae) and Quercus rubra (Fagaceae) en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal American Journal of Botany en_US
dash.depositing.author Holbrook, Noel
dc.date.available 2011-01-25T20:09:18Z

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  • FAS Scholarly Articles [7470]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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