Clonal variation in radiata pine seed orchards. 2. Flowering phenology  [1984]

Griffin, A.R. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Forest Research)

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Thirty clones were observed in 1968 and, in a different orchard, in 1972 and 1973. Clonal repeatability for time of emergence of first pink female strobili and for maximum pollen shed indicated sufficient genetic control to allow extrapolation from one site to another. Total period of pollen shed and the degree to which male and female flowering were asynchronous were more strongly influenced by environment. Early pollen producers will have the greatest chance of crossing with a wide range of other clones. Phenological variation appeared to have only a marginal effect on mean seed yield per cone in an orchard. In these orchards, phenology is likely to cause less deviation from random mating than would variation in fecundity traits. The degree of dichogamy in individual clones is generally insufficient to prevent self-pollination.

Other subjects

  • phenologie
  • clones
  • fenologia
  • floraison
  • clone
  • floracion
  • pinus radiata

From the journal

Australian Forest Research (Australia)

ISSN : 0004-914X