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Plant Reproduction

, Volume 27, Issue 2, pp 79–94 | Cite as

Flower development in Coffea arabica L.: new insights into MADS-box genes

  • Raphael Ricon de Oliveira
  • Igor Cesarino
  • Paulo Mazzafera
  • Marcelo Carnier Dornelas
Original Article

Abstract

Coffea arabica L. shows peculiar characteristics during reproductive development, such as flowering asynchrony, periods of floral bud dormancy, mucilage secretion and epipetalous stamens. The MADS-box transcription factors are known to control several developmental processes in plants, including flower and fruit development. Significant differences are found among plant species regarding reproductive development and little is known about the role of MADS-box genes in Coffea reproductive development. Thus, we used anatomical and comparative molecular analyses to explore the flowering process in coffee. The main morphological changes during flower development in coffee were observed by optical and scanning electron microscopy. Flowering asynchrony seems to be related to two independent processes: the asynchronous development of distinct buds before the reproductive induction and the asynchronous development of floral meristems within each bud after the reproductive induction. A total of 23 C. arabica MADS-box genes were characterized by sequence comparison with putative Arabidopsis orthologs and their expression profiles were analyzed by RT-PCR in different tissues. The expression of the ABC model orthologs in Coffea during floral development was determined by in situ hybridization. The APETALA1 (AP1) ortholog is expressed only late in the perianth, which is also observed for the APETALA3 and TM6 orthologs. Conversely, the PISTILLATA ortholog is widely expressed in early stages, but restrict to stamens and carpels in later stages of flower development, while the expression of the AGAMOUS ortholog is always restricted to fertile organs. The AP1 and PISTILLATA orthologs are also expressed at specific floral organs, such as bracts and colleters, respectively, suggesting a potential role in the development of such structures. Altogether, the results from our comprehensive expression analyses showed significant differences between the spatiotemporal expression profiles of C. arabica MADS-box genes and their orthologs, which suggests differential functionalization in coffee. Moreover, these differences might also partially explain the particular characteristics of floral development in coffee, such as mucilage secretion and formation of epipetalous stamens.

Keywords

Coffea arabica L. Flower development MADS-box genes Gene expression In situ hybridization 

Notes

Acknowledgments

We thank Instituto Agronômico de Campinas (IAC) for providing the plant materials, Dr. Sandra Maria Carmello-Guerreiro (IB/Unicamp) for the support and useful comments on the morphological analyses, Dr. Elliot W. Kitajima (NAP/ESALQ-USP) for the assistance in the scanning electron microscopy analysis, Dr. Siu Mui Tsai (Genome Lab/CENA) for the sequencing, Dr. Maria Bernadette Silvarolla (IAC) for support and assistance and Dr. David Newman for kindly proofreading the manuscript. Raphael Ricon de Oliveira thanks the Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the student fellowship, Paulo Mazzafera and Marcelo Carnier Dornelas thank CNPq for the research fellowships. This work was supported by FAPESP and CNPq.

Supplementary material

497_2014_242_MOESM1_ESM.doc (814 kb)
Supplementary material 1 (DOC 813 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Raphael Ricon de Oliveira
    • 1
  • Igor Cesarino
    • 2
    • 3
  • Paulo Mazzafera
    • 4
  • Marcelo Carnier Dornelas
    • 4
  1. 1.Centro de Biologia Molecular e Engenharia GenéticaUniversidade Estadual de CampinasCampinasBrazil
  2. 2.Department of Plant Systems BiologyVIBGhentBelgium
  3. 3.Department of Plant Biotechnology and BioinformaticsGhent UniversityGhentBelgium
  4. 4.Departamento de Biologia VegetalUniversidade Estadual de CampinasCampinasBrazil

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