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Provenance Variation in Growth of Seedling Apices of Sitka Spruce

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Shoot apex development is described for seedlings of Picea sitchensis (Bong.) Carr, from 47 provenances. The three stages previously used to describe the development of the shoot apex of other conifers are applicable to this species, but times of initiation and duration of each stage vary among the provenances. Anatomical evidence confirmed morphological evidence for a pattern of developmental variation that was closely related to the natural distribution of the species. Elongaton and needle production continued into July for seedlings from Alaska and into September for those from California. Bud scale production followed and extended for approximately one month. The rest stage extended until April, with only two weeks separating the first and last provenances in time of spring flushing. The size and shape of the shoot apex varied during these stages but the zonation pattern could not be distingusihed consistently.

Document Type: Journal Article

Affiliations: Forest Geneticist (attacked from Unesco), Agric. Research Council of Central Africa, P.O. Box 1210, Kitwe, Zambia

Publication date: June 1, 1966

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