The Phenotypic and Genetic Underpinnings of Flower Size in Polemoniaceae

Frontiers in Plant Science
Jacob B LandisPamela S Soltis

Abstract

Corolla length is a labile flower feature and has strong implications for pollinator success. However, the phenotypic and genetic bases of corolla elongation are not well known, largely due to a lack of good candidate genes for potential genetic exploration and functional work. We investigate both the cellular phenotypic differences in corolla length, as well as the genetic control of this trait, in Saltugilia (Polemoniaceae). Taxa in this clade exhibit a large range of flower sizes and differ dramatically in pollinator guilds. Flowers of each species were collected from multiple individuals during four stages of flower development to ascertain if cell number or cell size is more important in determining flower size. In Saltugilia, increased flower size during development appears to be driven more by cell size than cell number. Differences in flower size between species are governed by both cell size and cell number, with the large-flowered S. splendens subsp. grantii having nearly twice as many cells as the small-flowered species. Fully mature flowers of all taxa contain jigsaw cells similar to cells seen in sepals and leaves; however, these cells are not typically found in the developing flowers of most species. The proportio...Continue Reading

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Citations

Sep 4, 2019·Nature Plants·Hongyan ShanHongzhi Kong
Jun 28, 2016·Applications in Plant Sciences·Richard G J HodelPamela S Soltis

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Methods Mentioned

BETA
confocal microscopy
RNA-Seq
aminoacylation

Software Mentioned

BLAST
MarkerMiner
Geneious mapper
cutadapt
Trinity
BLAT
MP
Mesquite
EdgeR Bioconductor
R

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