Molecular genetic markers and rubber breeding in Thailand : 2 - Field stndy of the family RRIM600 x PB217 for QTL identification

Clément-Demange André, Prapan Kanlaya, Ratanawong R., Teerawatanasuk Kannikar. 2006. Molecular genetic markers and rubber breeding in Thailand : 2 - Field stndy of the family RRIM600 x PB217 for QTL identification. In : 2nd Thai-French Seminar Rubber Cooperation, Bangkok, Thailand, 1st -2nd june 2006. s.l. : s.n., 21 p. Thai-French Seminar Rubber Cooperation. 2, Bangkok, Thaïlande, 1 Juin 2006/2 Juin 2006.

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Résumé : For developing QTL detection based on the genetic linkage map of the cross RRIM600 x PB217, a clonal field trial was set in Thailand in June 2002. It will be studied until 2010 and targeted to the genetic analysis of the physiological parameters of the latex diagnostic which determine the metabolic typology of rubber clones. This trial, covering an area of 5 hectares, encompasses 196 progenies of the cross as well as the two parents, with every genotype represented by 5 to 16 replicated budded trees. The experimental design is an "alpha-plan" (incomplete block design): it was chosen for controlling the variation of the environment, for improving the levels of the heritabilities of the measured agricultural traits, and for improving the estimation of the genetic values of every genotype. Any trait with reasonably high heritability can be a candidate for possible QTL identification. So far, tapping has not begun yet, and QTL detection has not been attempted for any trait. In this communication, the characterization of traits related with growth, precocity of wintering, fruiting ability, and tolerance to water stress, is presented as a first characterization of the trial and of the genotypes. As growth is a complex trait, the associated heritabilities appear rather low, with a maximum of 0.36 for one height measurement. As the two parents are roughly equivalent in growth, variation among progenies within this family seems also rather low. This trial provides the rare opportunity to analyse the phenotypic variability displayed within a large size full-sib family of cultivated clones. It will also allow to select the best clones for recommendation to the planters, thereby combining short term and long term methodological and operational applications.

Mots-clés Agrovoc : Hevea brasiliensis, marqueur génétique, locus des caractères quantitatifs

Mots-clés géographiques Agrovoc : Thaïlande, France

Mots-clés complémentaires : QTL

Classification Agris : F30 - Génétique et amélioration des plantes

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