Plant Physiol. Drug Metab Dispos
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First published online April 9, 2002; 10.1104/pp.010613

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Plant Physiol, May 2002, Vol. 129, pp. 300-309

Molecular and Genetic Characterization of a Non-Climacteric Phenotype in Melon Reveals Two Loci Conferring Altered Ethylene Response in Fruit1

Christophe Périn,2 MariCarmen Gomez-Jimenez,2 Lynda Hagen, Catherine Dogimont, Jean-Claude Pech, Alain Latché, Michel Pitrat,* and Jean-Marc Lelièvre

Institut National de la Recherche Agronomique, Station de Génétique et d'Amélioration des Fruits et Légumes, Domaine St. Maurice, Boîte Postale 94, 84143 Montfavet cedex, France (C.P., L.H., C.D., M.P.); and Unité Mixte de Recherche Institut National de la Recherche Agronomique 990, Ecole Nationale Supérieure Agronomique de Toulouse, Boîte Postale 107, 31326 Castanet-Tolosan cedex, France (M.G.-J., J.-C.P., A.L., J.-M.L.)

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 × 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.

1 This work was supported in part by the Institut National de la Recherche Agronomique Action Incitative Programmée Aptitude à l'utilisation des Grains et des Fruits contracts in both laboratories. C.P. was a recipient of a doctoral fellowship from the Institut National de la Recherche Agronomique and Région Provence-Alpes Cote-d'Azur (France). M.G.-J. was a recipient of a postdoctoral fellowship from the Spanish "Ministerio de Educacion y Cultura."

2 These authors contributed equally to the paper.

* Corresponding author e-mail Michel.Pitrat{at}avignon.inra.fr; fax 33-4-32-72-27-02.

© 2002 American Society of Plant Physiologists


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