Analysis of the Floral Transcriptome Uncovers New Regulators of Organ Determination and Gene Families Related to Flower Organ Differentiation in Gerbera Hybrida (Asteraceae)

Overview

Journal Genome Res

Specialty Genetics

Date 2005 Mar 23

PMID 15781570

Citations 35

Authors

Roosa A E Laitinen

Juha Immanen

Petri Auvinen

Stephen Rudd

Edward Alatalo

Lars Paulin

Miia Ainasoja

Mika Kotilainen

Satu Koskela

Teemu H Teeri

Paula Elomaa

Affiliations

Soon will be listed here.

Abstract

Development of composite inflorescences in the plant family Asteraceae has features that cannot be studied in the traditional model plants for flower development. In Gerbera hybrida, inflorescences are composed of morphologically different types of flowers tightly packed into a flower head (capitulum). Individual floral organs such as pappus bristles (sepals) are developmentally specialized, stamens are aborted in marginal flowers, petals and anthers are fused structures, and ovaries are located inferior to other floral organs. These specific features have made gerbera a rewarding target of comparative studies. Here we report the analysis of a gerbera EST database containing 16,994 cDNA sequences. Comparison of the sequences with all plant peptide sequences revealed 1656 unique sequences for gerbera not identified elsewhere within the plant kingdom. Based on the EST database, we constructed a cDNA microarray containing 9000 probes and have utilized it in identification of flower-specific genes and abundantly expressed marker genes for flower scape, pappus, stamen, and petal development. Our analysis revealed several regulatory genes with putative functions in flower-organ development. We were also able to associate a number of abundantly and specifically expressed genes with flower-organ differentiation. Gerbera is an outcrossing species, for which genetic approaches to gene discovery are not readily amenable. However, reverse genetics with the help of gene transfer has been very informative. We demonstrate here the usability of the gerbera microarray as a reliable new tool for identifying novel genes related to specific biological questions and for large-scale gene expression analysis.

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