Premise:Leaf lobing and leaf size vary considerably across and within species,including among grapevines (Vitisspp.), some of the best‐studied leaves. Weexamined the relationship between leaf lobing and leaf area across grapevinepopulations that varied in extent of leaf lobing.
Methods:We used homologous landmarking techniques to measure 2632 leavesacross 2 years in 476 unique, genetically distinct grapevines fromfive biparentalcrosses that vary primarily in the extent of lobing. We determined to what extent leafarea explained variation in lobing, vein length, and vein to blade ratio.
Results:Although lobing was the primary source of variation in shape across theleaves we measured, leaf area varied only slightly as a function of lobing. Rather, leafarea increases as a function of total major vein length, total branching vein length, andvein to blade ratio. These relationships are stronger for more highly lobed leaves, withthe residuals for each model differing as a function of distal lobing.
Conclusions:For leaves with different extents of lobing but the same area, the morehighly lobed leaves have longer veins and higher vein to blade ratios, allowing themto maintain similar leaf areas despite increased lobing. Thesefindings show howmore highly lobed leaves may compensate for what would otherwise result in areduced leaf area, allowing for increasedphotosynthetic capacity through similarleaf size
American Journal of Botany
DOI of Published Version
Copyright © 2022 the Authors
Migicovsky, Zoë; Swift, Joel F.; Helget, Zachary; Klein, Laura L.; Ly, Anh; Maimaitiyiming, Matthew; Woodhouse, Karoline; Fennell, Anne; Kwasniewski, Misha; Miller, Allison J.; Cousins, Peter; and Chitwood, Daniel H., "Increases in Vein Length Compensate for Leaf Area Lost to Lobing in Grapevine" (2022). Agronomy, Horticulture and Plant Science Faculty Publications. 394.
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