Parallel evolution of storage roots in morning glories (Convolvulaceae)

BMC Plant Biology
Lauren A EsermanJames H Leebens-Mack

Abstract

Storage roots are an ecologically and agriculturally important plant trait that have evolved numerous times in angiosperms. Storage roots primarily function to store carbohydrates underground as reserves for perennial species. In morning glories, storage roots are well characterized in the crop species sweetpotato, where starch accumulates in storage roots. This starch-storage tissue proliferates, and roots thicken to accommodate the additional tissue. In morning glories, storage roots have evolved numerous times. The primary goal of this study is to understand whether this was through parallel evolution, where species use a common genetic mechanism to achieve storage root formation, or through convergent evolution, where storage roots in distantly related species are formed using a different set of genes. Pairs of species where one forms storage roots and the other does not were sampled from two tribes in the morning glory family, the Ipomoeeae and Merremieae. Root anatomy in storage roots and fine roots was examined. Furthermore, we sequenced total mRNA from storage roots and fine roots in these species and analyzed differential gene expression. Anatomical results reveal that storage roots of species in the Ipomoeeae tribe, s...Continue Reading

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Datasets Mentioned

BETA
PRJNA448837

Methods Mentioned

BETA
dissectus
RNA-seq
PCR

Software Mentioned

EdgeR
Trinity package
IsoPct
SATé
Seq
OrthoFinder
Bowtie 2
Transdecoder
Bowtie
RAxML

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