Jul 23, 2013

A quantitative genetic basis for leaf morphology in a set of precisely defined tomato introgression lines

The Plant Cell
Daniel H ChitwoodNeelima R Sinha

Abstract

Introgression lines (ILs), in which genetic material from wild tomato species is introgressed into a domesticated background, have been used extensively in tomato (Solanum lycopersicum) improvement. Here, we genotype an IL population derived from the wild desert tomato Solanum pennellii at ultrahigh density, providing the exact gene content harbored by each line. To take advantage of this information, we determine IL phenotypes for a suite of vegetative traits, ranging from leaf complexity, shape, and size to cellular traits, such as stomatal density and epidermal cell phenotypes. Elliptical Fourier descriptors on leaflet outlines provide a global analysis of highly heritable, intricate aspects of leaf morphology. We also demonstrate constraints between leaflet size and leaf complexity, pavement cell size, and stomatal density and show independent segregation of traits previously assumed to be genetically coregulated. Meta-analysis of previously measured traits in the ILs shows an unexpected relationship between leaf morphology and fruit sugar levels, which RNA-Seq data suggest may be attributable to genetically coregulated changes in fruit morphology or the impact of leaf shape on photosynthesis. Together, our results both imp...Continue Reading

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  • Citations56

Citations

Mentioned in this Paper

Quantitative Trait Loci
Genes, Plant
Meta-Analysis (Publications)
Fructose
Epidermal Cell
Science of Morphology
Tomatoes
Solanum lycopersicum extract
Gene Expression Regulation, Plant
Genome Mapping

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