TAILIEUCHUNG - Báo cáo khoa học: "Analyse diallèle et intégration de la sensibilité à la rouille courbeuse dans le programme d’amélioration du pin maritime"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Analyse diallèle et intégration de la sensibilité à la rouille courbeuse dans le programme d’amélioration du pin maritime. | Ann Sci For 1997 54 83-106 Elsevier INRA 83 Article original Analyse diallèle et integration de la sensibilité à la rouille courbeuse dans le programme d amelioration du pin maritime p Baradat1 ML Desprez-Loustau2 Unra et untie de recherche biometric du Cirad-CP 2477 avenue du Val-de-Montferrand BP 5035 34032 Montpellier cedex Ị Station de pathologic végéĩale centre de recherches Inra de Bordeaux 7Ỉ avenue E-Bourleaux BP 81 33883 Villenave-d Ornon cedex France Re u le 27 avril 1995 accepté le 5 aoũt 1996 Summary - Diallel analysis and integration in the breeding program of maritime pine of sensitivity to twisting rust. Maritime pines of the Landes provenance from two diallei mating designs have been studied between the third and fifth growing seasons for sensitivity to twisting rust Malampsora pinitorqua growth and phenology. The best criterion for sensitivity to twisting rust is the percentage of shoots with at least one canker occurring in the same growing season. Expression of rust sensitivity by this trait is partly dependent on vigour positive correlation and lateness negative correlation . However the major part of between-families variability for percentage of attacked shoots may be related to the original behaviour for this trait uncorrelated to vigour and phenology. Genetic analysis of sensitivity has shown that the part of variability attributable to maternal effects is unsignificant. The same is true for genetic variability of dominance effects. On the other hand additive genetic variability is great and highly significant. This variability would enable to realize important genetic gains for Melampsora resistance in Landes origin of maritime pine. Genetic correlation between rust sensitivity and polycyclism seems to be non-existent. Genetic correlation between rust sensitivity and juvenile growth expressed by 5 years height is not stable. It has a minor potential influence on integration of rust resistance criterion in the breeding program of maritime .

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