Phenotypic Differences Between Natural and Selected Populations of Picea Abies. I. Frost Hardiness. Westin, J., Sundblad, L., Strand, M., & Hällgren, J. Scandinavian Journal of Forest Research, 15(5):489–499, January, 2000. Publisher: Taylor & Francis _eprint: https://doi.org/10.1080/028275800750173393
Phenotypic Differences Between Natural and Selected Populations of Picea Abies. I. Frost Hardiness [link]Paper  doi  abstract   bibtex   
The frost hardiness of non-juvenile Norway spruce [Picea abies (L.) Karst.] populations growing in northern Sweden (63°54' N) was monitored during 1996-1997. The investigated progenies originated from 12 natural populations and six seed orchards located between 58° N and 68° N in Sweden. Frost hardiness of needles was assessed by measuring chlorophyll fluorescence and electrolyte leakage after freezing. The loss of frost hardiness in 1-yr-old needles during spring occurred slightly earlier in populations originating north of 63°30' N than in those originating further south. Dehardening was slightly delayed in selected populations compared with natural populations of similar origin. The level of frost hardiness during autumn was higher in populations originating north of 63°30' N than in those originating south of this latitude, but there were no clear differences in frost hardiness between selected and natural populations of similar origin. The results are discussed in relation to climatic factors and inherent growth rhythms.
@article{westin_phenotypic_2000,
	title = {Phenotypic {Differences} {Between} {Natural} and {Selected} {Populations} of {Picea} {Abies}. {I}. {Frost} {Hardiness}},
	volume = {15},
	issn = {0282-7581},
	url = {https://doi.org/10.1080/028275800750173393},
	doi = {10/bk8hkf},
	abstract = {The frost hardiness of non-juvenile Norway spruce [Picea abies (L.) Karst.] populations growing in northern Sweden (63°54' N) was monitored during 1996-1997. The investigated progenies originated from 12 natural populations and six seed orchards located between 58° N and 68° N in Sweden. Frost hardiness of needles was assessed by measuring chlorophyll fluorescence and electrolyte leakage after freezing. The loss of frost hardiness in 1-yr-old needles during spring occurred slightly earlier in populations originating north of 63°30' N than in those originating further south. Dehardening was slightly delayed in selected populations compared with natural populations of similar origin. The level of frost hardiness during autumn was higher in populations originating north of 63°30' N than in those originating south of this latitude, but there were no clear differences in frost hardiness between selected and natural populations of similar origin. The results are discussed in relation to climatic factors and inherent growth rhythms.},
	number = {5},
	urldate = {2021-11-08},
	journal = {Scandinavian Journal of Forest Research},
	author = {Westin, Johan and Sundblad, Lars-Göran and Strand, Martin and Hällgren, Jan-Erik},
	month = jan,
	year = {2000},
	note = {Publisher: Taylor \& Francis
\_eprint: https://doi.org/10.1080/028275800750173393},
	keywords = {Buds, Climate, Hardiness, Needles, Norway Spruce, Picea Abies, Rhythm, Selection},
	pages = {489--499},
}

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