Unraveling new genes associated with seed development and metabolism in Bixa orellana L. by expressed sequence tag (EST) analysis

Soares Virgínia L.F., Rodrigues Simone M., de Oliveira Tahise M., De Queiroz Talisson O., Lima Lívia S., Hora Junior Braz Tavares, Gramacho Karina Peres, Micheli Fabienne, Cascardo Julio Cezar M., Otoni Wagner C., Gesteira Abelmon, Costa Marcio Gilberto Cardoso. 2011. Unraveling new genes associated with seed development and metabolism in Bixa orellana L. by expressed sequence tag (EST) analysis. Molecular Biology Reports, 38 (2) : 1329-1340.

https://doi.org/10.1007/s11033-010-0234-8

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Quartile : Q2, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY

Résumé : The tropical tree Bixa orellana L. produces a range of secondary metabolites which biochemical and molecular biosynthesis basis are not well understood. In this work we have characterized a set of ESTs from a nonnormalized cDNA library of B. orellana seeds to obtain information about the main developmental and metabolic processes taking place in developing seeds and their associated genes. After sequencing a set of randomly selected clones, most of the sequences were assigned with putative functions based on similarity, GO annotations and protein domains. The most abundant transcripts encoded proteins associated with cell wall (prolyl 4-hydroxylase), fatty acid (acyl carrier protein), and hormone/flavonoid (2OG-Fe oxygenase) synthesis, germination (MADS FLClike protein) and embryo development (AP2/ERF transcription factor) regulation, photosynthesis (chlorophyll a-b binding protein), cell elongation (MAP65-1a), and stress responses (metallothionein- and thaumatin-like proteins). Enzymes were assigned to 16 different metabolic pathways related to both primary and secondary metabolisms. Characterization of two candidate genes of the bixin biosynthetic pathway, BoCCD and BoOMT, showed that they belong, respectively, to the carotenoid-cleavage dioxygenase 4 (CCD4) and caffeic acid O-methyltransferase (COMT) families, and are up-regulated during seed development. It indicates their involvement in the synthesis of this commercially important carotenoid pigment in seeds of B. orellana. Most of the genes identified here are the first representatives of their gene families in B. orellana.

Mots-clés Agrovoc : Bixa orellana

Mots-clés géographiques Agrovoc : Brésil

Classification Agris : F30 - Génétique et amélioration des plantes
F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

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