Molecular and genetic characterization of a non-climacteric phenotype in melon reveals two loci conferring altered ethylene response in fruit

Perin Christophe, Gomez-Jimenez Mari Carmen, Hagen Lynda, Dogimont Catherine, Pech Jean-Claude, Latché Alain, Pitrat Michel, Lelièvre Jean-Marc. 2002. Molecular and genetic characterization of a non-climacteric phenotype in melon reveals two loci conferring altered ethylene response in fruit. Plant Physiology, 129 (1) : 300-309.

Résumé : Fruit ripening and abscission are associated with an ethylene burst in several melon (#Cucumis melo#) genotypes. In cantaloupe as in other climacteric fruit, exogenous ethylene can prematurely induce abscission, ethylene production, and ripening. Melon genotypes without fruit abscission or without ethylene burst also exist and are, therefore, non-climacteric. In the nonabscising melon fruit PI 161375, exogenous ethylene failed to stimulate abscission, loss of firmness, ethylene production, and expression of all target genes tested. However, the PI 161375 etiolated seedlings displayed the usual ethylene-induced triple response. Genetic analysis on a population of recombinant cantaloupe Charentais x PI 161375 inbred lines in segregation for fruit abscission and ethylene production indicated that both characters are controlled by two independent loci, abscission layer (Al)-3 and Al-4. The non-climacteric phenotype in fruit tissues is attributable to ethylene insensitivity conferred by the recessive allelic forms from PI 161375. Five candidate genes (two ACO, two ACS, and ERS) that were localized on the melon genetic map did not exhibit colocalization with Al-3 or Al-4.

Mots-clés Agrovoc : Cucumis melo, maturation, abscission, éthylène, phénotype, génétique moléculaire, stade de développement végétal, expression des gènes, réponse de la plante

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

Auteurs et affiliations

• Perin Christophe, INRA (FRA) ORCID: 0000-0002-2469-310X
• Gomez-Jimenez Mari Carmen, INRA (FRA)
• Hagen Lynda, INRA (FRA)
• Dogimont Catherine, INRA (FRA)
• Pech Jean-Claude, INRA (FRA)
• Latché Alain, INRA (FRA)
• Pitrat Michel, INRA (FRA)
• Lelièvre Jean-Marc, INRA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/556790/)

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