Photoperiodic control of growth and growth cessation in 30 half sib families of Serbian spruce seedlings (Picea omorica Panc./Purkyne)
1992
Isajev, V. (Faculty of Forestry, Belgrade (Yugoslavia)) | Dorming, I.
The first scientific information about variability in the photoperiodic reactions of 30 Serbian-spruce half-sib families from west Serbia (Yugoslavia) is presented. At the day length of 10-12 hours, shoot growth ceased and the shoots formed their terminal buds, so far family started its dormancy. With the prolongation of day lenght, growth continued. The optimal effect on the growth of shoots was obtained by a day length of 18 to 20 hours. As that effect was conditioned by visible light, it was the case of a true photoperiodic effect on Serbian spruce. Half-sib families reacted differently to the changes of photoperiods, and the great intrafamily variability was the consequence of a high degree of species heterozygosity.
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