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The Effect of Daylength on Root Growth of Sitka Spruce

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First-year seedlings of Sitka spruce were grown with either 8 or 18 hr of constant light intensity. In general long-day plants showed a constant rate of root growth over the 81-day observation period, whereas root growth of seedlings transferred to short days decreased within 2 weeks, then increased again and later declined. Short-day plants returned to long days paralleled long-day seedlings in respect to root growth even though top growth had ceased. The daily rhythm of root elongation was similar in long days and short days; root growth appeared to be stimulated during the light period. Forest Sci. 18:27-31.

Keywords: Picea sitchensis; Root growth; growth rhythm; photoperiod

Document Type: Journal Article

Affiliations: Head of Wood Biological Sec., Dep. of Microtechnological Wood Research, Swiss Federal Instit. of Technology, Zurich

Publication date: March 1, 1972

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