Flowering traits as a component of reproductive success in maritime pine clonal seed orchards
In: BONGA J.M., PARK Y.-S., TRONTIN J.-F. (Eds), 2019, Proceedings of the 5th International Conference of the IUFRO Working Party 2.09.02 on “Clonal Trees in The Bioeconomy Age: Opportunities and Challenges”, Coimbra, Portugal, Sept. 10-15, 2018, pp. 173-179.
Trontin JF, Alazard P, Debille S, Bouffier L
Collaboration FCBA, INRAE (Biogeco)
XYLOBIOTECH technical support :
In vitro labAbstrct:
Open-pollinated clonal seed orchards are a cost-effective way to deliver expected genetic gain in new varieties provided that female and male contributions of selected (grafted) genotypes are well balanced and that contamination by foreign pollen is low. Molecular analyses of maritime pine clonal orchards revealed high pollen contamination rates, therefore questioning the mating structure in relation with flowering precocity and intensity of progenitors. A strong genetic control of flowering traits is suggested from the preliminary survey of 3 clonal orchards during two consecutive seasons. Female flowering precocity could not be related with pollen contamination rate but male flowering intensity could partly explain reproductive success.