title: Studies on the descendancy of four populations of Koekelaere pines: Pinus nigra Arnold, subsp. laricio (Poiret) Maire, cv. Koekelaere. II. Heritability as a function of parental age.
abstract: The variations of heritability as a function of parental age are studied in Koekelaere pines [Pinus nigra Arnold, laricio (Poiret) Maire, cv. Koekelaere]. The age of the parental trees varies between 26 and 101 years. 16 different traits are analysed. It is shown that heritability does not vary as a function of parental age. These results are discussed in relation with the problems of ageing in trees and of the theories of ageing.
mesh_terms: D000375:Aging; D014644:Genetic Variation; D010641:Phenotype; D012641:Selection, Genetic; D014197:Trees