Possibilities of Genetic Gain for Vigorous Growth of Black Alder (Alnus glutinosa (L.) Gaertn.) by Clonal Seed Orchards

1991

S. 261-271

2 Abb., 3 Tab., 17 Lit. Ang.

Unselbständiges Werk

200041921

Sumarski List 1991 ; Nr. 6-9, S. 261-271

In subpopulations of Black Alder (Alnus glutinosa) in the northwest Croatia, parent trees were selected by phenotypic selection. Upon grafting, thirty- two selected clones were used to establish a clonal seed orchard in Durdevac. The calculated genetic gain from phenotypic selection for average height increment was 6,3%. The realized genetic gain for the same trait was calculated on the base of the raised half-sib progenies on different sites was 62,2%, for the experimental plot of Lisicine and 55,1% for Crni jarci. The expected genetic extra gain, as calculated on different selection intensities, created on the GCA of female trees, with the hypothesis of establishing a second-cycle orchard of the parent generation, totally amounted to 9,2 and 13%, depending on the experiment. The authors suggest the use of at least 50 clones of this species in future seed orchard establishments, separated according to subpopulations, considering that they are to be used in further tree improvement.