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Modeling development and quantitative trait mapping reveal independent genetic modules for leaf size and shape
Author(s) -
Baker Robert L.,
Leong Wen Fung,
Brock Marcus T.,
Markelz R. J. Cody,
Covington Michael F.,
Devisetty Upendra K.,
Edwards Christine E.,
Maloof Julin,
Welch Stephen,
Weinig Cynthia
Publication year - 2015
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.13509
Subject(s) - biology , quantitative trait locus , allometry , trait , inbred strain , leaf size , quantitative genetics , genetics , genetic variation , evolutionary biology , botany , gene , ecology , computer science , programming language
Summary Improved predictions of fitness and yield may be obtained by characterizing the genetic controls and environmental dependencies of organismal ontogeny. Elucidating the shape of growth curves may reveal novel genetic controls that single‐time‐point ( STP ) analyses do not because, in theory, infinite numbers of growth curves can result in the same final measurement. We measured leaf lengths and widths in Brassica rapa recombinant inbred lines ( RIL s) throughout ontogeny. We modeled leaf growth and allometry as function valued traits ( FVT ), and examined genetic correlations between these traits and aspects of phenology, physiology, circadian rhythms and fitness. We used RNA ‐seq to construct a SNP linkage map and mapped trait quantitative trait loci ( QTL ). We found genetic trade‐offs between leaf size and growth rate FVT and uncovered differences in genotypic and QTL correlations involving FVT vs STP s. We identified leaf shape (allometry) as a genetic module independent of length and width and identified selection on FVT parameters of development. Leaf shape is associated with venation features that affect desiccation resistance. The genetic independence of leaf shape from other leaf traits may therefore enable crop optimization in leaf shape without negative effects on traits such as size, growth rate, duration or gas exchange.

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