EIN3-like gene expression during fruit ripening of Cavendish banana (Musa acuminata cv. Grande naine)

Mbéguié-A-Mbéguié Didier, Hubert Olivier, Fils-Lycaon Bernard, Chillet Marc, Baurens Franc-Christophe. 2008. EIN3-like gene expression during fruit ripening of Cavendish banana (Musa acuminata cv. Grande naine). Physiologia Plantarum, 133 (2) : 435-448.

Résumé : Ethylene signal transduction initiates with ethylene binding at receptor proteins and terminates in a transcription cascade involving the EIN3/EIL transcription factors. Here, we have isolated four cDNAs homologs of the Arabidopsis EIN3/EIN3-like gene, MA-EILs (Musa acuminata ethylene insensitive 3-like) from banana fruit. Sequence comparison with other banana EIL gene already registered in the database led us to conclude that, at this day, at least five different genes namely MA-EIL1, MA-EIL2/AB266318, MA-EIL3/AB266319, MA-EIL4/AB266320 and AB266321 exist in banana. Phylogenetic analyses included all banana EIL genes within a same cluster consisting of rice OsEILs, a monocotyledonous plant as banana. However, MA-EIL1, MA-EIL2/AB266318, MA-EIL4/AB266320 and AB266321 on one side, and MA-EIL3/AB266319 on the other side, belong to two distant subclusters. MA-EIL mRNAs were detected in all examined banana tissues but at lower level in peel than in pulp. According to tissues, MA-EIL genes were differentially regulated by ripening and ethylene in mature green fruit and wounding in old and young leaves. MA-EIL2/AB266318 was the unique ripening- and ethylene-induced gene; MA-EIL1, MA-EIL4/Ab266320 and AB266321 genes were downregulated, while MA-EIL3/AB266319 presented an unusual pattern of expression. Interestingly, a marked change was observed mainly in MA-EIL1 and MA-EIL3/Ab266319 mRNA accumulation concomitantly with changes in ethylene responsiveness of fruit. Upon wounding, the main effect was observed in MA-EIL4/AB266320 and AB266321 mRNA levels, which presented a markedly increase in both young and old leaves, respectively. Data presented in this study suggest the importance of a transcriptionally step control in the regulation of EIL genes during banana fruit ripening.

Mots-clés Agrovoc : Musa acuminata, expression des gènes, développement biologique, fruit (botanique), mûrissage, éthylène, régulation physiologique

Classification Agris : F30 - Génétique et amélioration des plantes
F62 - Physiologie végétale - Croissance et développement

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

Auteurs et affiliations

• Mbéguié-A-Mbéguié Didier, CIRAD-PERSYST-UMR QUALITROP (GLP) ORCID: 0000-0002-9256-3999
• Hubert Olivier, CIRAD-PERSYST-UMR Qualisud (GLP)
• Fils-Lycaon Bernard, INRA (GLP)
• Chillet Marc, CIRAD-PERSYST-UMR Qualisud (GLP)
• Baurens Franc-Christophe, CIRAD-BIOS-UMR DAP (FRA) ORCID: 0000-0002-5219-8771

Source : Cirad - Agritrop (https://agritrop.cirad.fr/543967/)

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