Studies on the Descendancy of Four Populations of Koekelaere Pines: <i>Pinus nigra</i> Arnold, subsp. <i>laricio</i> (Poiret) Maire, cv. <i>Koekelaere</i>

Abstract

The variations of heritability as a function of parental age are studied in Koekelaere pines [Pinus nigra Arnold, subsp. 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.