Relationships between yield and some structural traits of the laticiferous system in Hevea clones resistant to South American leaf blight

Garcia Dominique, Le Guen Vincent, Mattos Carlos Raimunto Reis, De Souza Gonçalves Paulo, Clément-Demange André. 2002. Relationships between yield and some structural traits of the laticiferous system in Hevea clones resistant to South American leaf blight. Crop Breeding and Applied Biotechnology, 2 (2) : 307-317.

Autre titre : Relations entre le rendement et certaines caractéristiques structurales du système laticifère chez des clones d'hévéa résistants à la maladie sud-américaine des feuilles

Résumé : Latex yield and six anatomical bark traits were measured in a five-year-old rubber tree clonal trial planted in Ituberá (Bahia, Brazil), on forty-nine different clones. The clones were pre-selected for resistance to SALB (South American Leaf Blight) caused by the fungus Microcyclus Ulei (P.Henn.) v. Arx. The studied traits were: average yield (AY), girth (SC), virgen bark thickness (BT), total number of latex vessel rings (NR), average density of latex vessel per ring (DV), average diameter of latex vessels (DL) and average distance between consecutive latex vessel rings (AD). Phenotypic, genotypic and environmental correlations, and coefficient of genetic prediction (CGP) were calculated for all characters. There were considerable genetic variations between clones for AY, NR and BT, as indicated by high values of CGP. The genetic correlations were significant between AY and NR. The possibility to use NR as predictor of AY is discussed and the expected gains in percent of several references for AY are computed. FDR 4575, FDR 6099, FDR 5240, FDR 2010, FDR 5597, CDC 308, FDR 4151, CDC 943, MDX 608 clones were retained for their potential yield and recommended for multilocation large scale trials.

Mots-clés Agrovoc : Hevea brasiliensis, Microcyclus ulei, rendement des cultures, latex, anatomie végétale, résistance aux maladies, clone, variation génétique, essai de variété, critère de sélection, prévision de rendement

Mots-clés géographiques Agrovoc : Brésil

Mots-clés complémentaires : Système laticifère

Classification Agris : F30 - Génétique et amélioration des plantes
H20 - Maladies des plantes
F01 - Culture des plantes

Auteurs et affiliations

• Garcia Dominique, CIRAD-CP-HEVEA (BRA)
• Le Guen Vincent, CIRAD-CP-HEVEA (GUF)
• Mattos Carlos Raimunto Reis, Michelin Brésil (BRA)
• De Souza Gonçalves Paulo, IAC [Instituto Agronomico] (BRA)
• Clément-Demange André, CIRAD-CP-HEVEA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/518975/)

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