Identification of transcription factors controlling floral morphology in wild Petunia species with contrasting pollination syndromes

Yarahmadov, Tural; Robinson, Sarah; Hanemian, Mathieu; Pulver, Valentin; Kuhlemeier, Cris (2020). Identification of transcription factors controlling floral morphology in wild Petunia species with contrasting pollination syndromes. The plant journal, 104(2), pp. 289-301. Wiley 10.1111/tpj.14962

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Adaptation to different pollinators is an important driver of speciation in the angiosperms. Genetic approaches such as QTL mapping have been successfully used to identify the underlying speciation genes. However, these methods are often limited by widespread suppression of recombination due to divergence between species. While the mutations that caused the interspecific differences in floral color and scent have been elucidated in a variety of plant genera, the genes that are responsible for morphological differences remain mostly unknown. Differences in floral organ length determine the pollination efficiency of hawkmoths and hummingbirds, and therefore the genes that control these differences are potential speciation genes. Identifying such genes is challenging, especially in non‐model species and when studying complex traits for which little prior genetic and biochemical knowledge is available. Here we combine transcriptomics with detailed growth analysis to identify candidate transcription factors underlying interspecific variation in the styles of Petunia flowers. Starting from a set of 2284 genes, stepwise filtering for expression in styles, differential expression between species, correlation with growth‐related traits, allele‐specific expression in interspecific hybrids, and/or high‐impact polymorphisms resulted in a set of 43 candidate speciation genes. Validation by virus‐induced gene silencing identified two MYB transcription factors, EOBI and EOBII, that were previously shown to regulate floral scent emission, a trait associated with pollination by hawkmoths.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Development

UniBE Contributor:

Yarahmadov, Tural; Robinson, Sarah Jane; Hanemian, Mathieu Julien; Pulver, Valentin Johannes and Kuhlemeier, Cris

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0960-7412

Publisher:

Wiley

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

21 Sep 2020 15:17

Last Modified:

24 Feb 2021 09:52

Publisher DOI:

10.1111/tpj.14962

PubMed ID:

32780443

Uncontrolled Keywords:

speciation genes; Petunia; transcription factors; MYB; style; floral morphology; transcriptomics; growth analysis; biomechanics; ACME; RNAseq

BORIS DOI:

10.7892/boris.146530

URI:

https://boris.unibe.ch/id/eprint/146530

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