Expression patterns of cell wall-modifying genes from banana during fruit ripening and in relationship with finger drop

Mbéguié-A-Mbéguié Didier, Hubert Olivier, Baurens Franc-Christophe, Matsumoto Takashi, Chillet Marc, Fils-Lycaon Bernard, Sidibé-Bocs Stéphanie. 2009. Expression patterns of cell wall-modifying genes from banana during fruit ripening and in relationship with finger drop. Journal of Experimental Botany, 60 (7) : 2021-2034.

Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Few molecular studies have been devoted to the finger drop process that occurs during banana fruit ripening. Recent studies revealed the involvement of changes in the properties of cell wall polysaccharides in the pedicel rupture area. In this study, the expression of cell-wall modifying genes was monitored in peel tissue during post-harvest ripening of Cavendish banana fruit, at median area (control zone) and compared with that in the pedicel rupture area (drop zone). To this end, three pectin methylesterase (PME) and seven xyloglucan endotransglycosylase/hydrolase (XTH) genes were isolated. The accumulation of their mRNAs and those of polygalaturonase, expansin, and pectate lyase genes already isolated from banana were examined. During post-harvest ripening, transcripts of all genes were detected in both zones, but accumulated differentially. MaPME1, MaPG1, and MaXTH4 mRNA levels did not change in either zone. Levels of MaPME3 and MaPG3 mRNAs increased greatly only in the control zone and at the late ripening stages. For other genes, the main molecular changes occurred 1-4 d after ripening induction. MaPME2, MaPEL1, MaPEL2, MaPG4, MaXTH6, MaXTH8, MaXTH9, MaEXP1, MaEXP4, and MaEXP5 accumulated highly in the drop zone, contrary to MaXTH3 and MaXTH5, and MaEXP2 throughout ripening. For MaPG2, MaXET1, and MaXET2 genes, high accumulation in the drop zone was transient. The transcriptional data obtained from all genes examined suggested that finger drop and peel softening involved similar mechanisms. These findings also led to the proposal of a sequence of molecular events leading to finger drop and to suggest some candidates.

Mots-clés Agrovoc : Musa (bananes), expression des gènes, mûrissage, chute de fruit, polyholoside, paroi cellulaire, qualité, hydrolyse enzymatique, enzyme, arn messager

Mots-clés géographiques Agrovoc : Guadeloupe, France

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

Champ stratégique Cirad : Axe 3 (2005-2013) - Alimentation accessible et de qualité

Auteurs et affiliations

• Mbéguié-A-Mbéguié Didier, CIRAD-PERSYST-UMR QUALITROP (GLP) ORCID: 0000-0002-9256-3999
• Hubert Olivier, CIRAD-PERSYST-UMR Qualisud (GLP)
• Baurens Franc-Christophe, CIRAD-BIOS-UMR DAP (FRA) ORCID: 0000-0002-5219-8771
• Matsumoto Takashi, NIAS (JPN)
• Chillet Marc, CIRAD-PERSYST-UMR Qualisud (BRA)
• Fils-Lycaon Bernard, INRA (GLP)
• Sidibé-Bocs Stéphanie, CIRAD-BIOS-UMR DAP (FRA) ORCID: 0000-0001-7850-4426

Source : Cirad - Agritrop (https://agritrop.cirad.fr/549341/)

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