Periodicity in Shoot Elongation Among Populations of Pinus contorta from the Northern Rocky Mountains

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Abstract
Periodicity in 3rd-year shoot elongation was assessed in 15 lodgepole pines from each of 30 populations. Periodic measurements of shoot elongation were made on seedlings growing in a greenhouse. Data were fitted to regression models that accounted for nearly all the variance in seasonal elongation of individual trees. Regression statistics allowed calculations of the initiation, rate, duration, cessation, and amount of elongation. Analyses of variance showed that populations differed little in the initiation of shoot elongation, but exhibited tremendous genetic divergence in the rate, duration, cessation and amount of elongation. Patterns of differentiation were strongly and negatively related to the elevation of the seed source.

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