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Abstract Detail


Reproductive Development

Dornelas, Marcelo C. [1], Camargo, Raquel L. B. [2], Takita, Marco A. [2], Carmello-Guerreiro, Sandra [3], Machado, Marcos A. [2].

A genetic framework for flower development in Citrus spp.

The floral transition is one the most drastic changes occurring during the life cycle of a plant. The shoot apical meristem switches from the production of leaves with associated secondary shoot meristems to the production of flower meristems. This transition is abrupt and generally irreversible, suggesting it is regulated by a robust gene regulatory network capable of driving sharp transitions. Following this transition, the development of floral organ primordia takes place under the control of a hierarchically organized network of transcription factors. A large number of genes acting within these pathways have been cloned in herbaceous model plants such as Arabidopsis thaliana. In this paper we report the results of our search in the Citrus expressed sequence tag (CitEST) database for expressed sequence tags (ESTs) showing sequence homology with known elements of flower development pathways. We have searched all sequence clusters in the CitEST database and identified more than one hundred Citrus spp sequences that codify putative conserved elements of the autonomous, vernalization-, photoperiod response- and gibberelic acid-controlled flowering-time pathways. Additionally, we have characterized in silico putative members of the Citrus spp homologs to the Arabidopsis CONSTANS and MADS families of transcription factors.


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Related Links:
http://www.centrodecitricultura.br/


1 - Universidade Estadual de Campinas, UNICAMP, Instituto de Biologia, Departamento de Fisiologia Vegetal, Cidade Universitária ¨Zeferino Vaz¨, Campinas, SP, 13.083-970, Brazil
2 - Instituto Agronômico de Campinas, Centro APTA ¨Sylvio Moreira¨
3 - Universidade Estadual de Campinas, UNICAMP, Departamento de Botanica

Keywords:
Citrus
flowering pathways
MADs box genes
CONSTANS genes
data mining
EST
Functional genomics.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P28028
Abstract ID:859


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