Reproductive phenology in a Norway spruce seed orchard
Reproductive phenology was studied in a Norway spruce seed orchard, located in southern Finland (62°13âN, 25°24âE), consisting of 67 clones from northern Finland (64°â67°N). Timing of flowering was determined on the basis of data recorded by a pollen catch meter during 1984â1995, and visual obse...
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ftdoajarticles:oai:doaj.org/article:115920f3b6da44c495807d3462ac4d6b 2023-05-15T17:42:42+02:00 Reproductive phenology in a Norway spruce seed orchard Nikkanen, Teijo 2001-01-01T00:00:00Z https://doi.org/10.14214/sf.602 https://doaj.org/article/115920f3b6da44c495807d3462ac4d6b EN eng Finnish Society of Forest Science https://www.silvafennica.fi/article/602 https://doaj.org/toc/2242-4075 2242-4075 doi:10.14214/sf.602 https://doaj.org/article/115920f3b6da44c495807d3462ac4d6b Silva Fennica, Vol 35, Iss 1 (2001) Forestry SD1-669.5 article 2001 ftdoajarticles https://doi.org/10.14214/sf.602 2022-12-31T09:14:32Z Reproductive phenology was studied in a Norway spruce seed orchard, located in southern Finland (62°13âN, 25°24âE), consisting of 67 clones from northern Finland (64°â67°N). Timing of flowering was determined on the basis of data recorded by a pollen catch meter during 1984â1995, and visual observations made on grafts in 1989, 1992, 1993 and 1995. The genetic and environmental factors affecting female and male phenology, and reproductive synchronisation were studied. The between-year variation in the timing of flowering was more than three weeks. However, when it was defined on the basis of the effective temperature sum, the variation was smaller. No phenological reproductive isolation was found between the seed orchard and surrounding natural forests. The duration of the receptive period of the seed orchard varied from 5 to 8 days, and anthesis determined on the basis of airborne pollen from 5 to 10 days. The receptive period started about one day earlier than anthesis, except in one abnormally warm flowering period when female and male flowering started simultaneously. In general, the flowering periods of the different clones overlapped. The clonal differences in the phenology of receptivity were in most cases statistically significant, but in pollen shedding they were not. The broad-sense heritability estimates were higher for female than for male phenology. Environmental factors, conversely, had a stronger effect on male phenology. A wide graft spacing and a graft position that favoured solar radiation on the lower parts of the crown promoted early pollen shedding and, subsequently, better reproductive synchronisation between female and male flowering. Article in Journal/Newspaper Northern Finland Directory of Open Access Journals: DOAJ Articles Norway Silva Fennica 35 1 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Forestry SD1-669.5 |
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Forestry SD1-669.5 Nikkanen, Teijo Reproductive phenology in a Norway spruce seed orchard |
topic_facet |
Forestry SD1-669.5 |
description |
Reproductive phenology was studied in a Norway spruce seed orchard, located in southern Finland (62°13âN, 25°24âE), consisting of 67 clones from northern Finland (64°â67°N). Timing of flowering was determined on the basis of data recorded by a pollen catch meter during 1984â1995, and visual observations made on grafts in 1989, 1992, 1993 and 1995. The genetic and environmental factors affecting female and male phenology, and reproductive synchronisation were studied. The between-year variation in the timing of flowering was more than three weeks. However, when it was defined on the basis of the effective temperature sum, the variation was smaller. No phenological reproductive isolation was found between the seed orchard and surrounding natural forests. The duration of the receptive period of the seed orchard varied from 5 to 8 days, and anthesis determined on the basis of airborne pollen from 5 to 10 days. The receptive period started about one day earlier than anthesis, except in one abnormally warm flowering period when female and male flowering started simultaneously. In general, the flowering periods of the different clones overlapped. The clonal differences in the phenology of receptivity were in most cases statistically significant, but in pollen shedding they were not. The broad-sense heritability estimates were higher for female than for male phenology. Environmental factors, conversely, had a stronger effect on male phenology. A wide graft spacing and a graft position that favoured solar radiation on the lower parts of the crown promoted early pollen shedding and, subsequently, better reproductive synchronisation between female and male flowering. |
format |
Article in Journal/Newspaper |
author |
Nikkanen, Teijo |
author_facet |
Nikkanen, Teijo |
author_sort |
Nikkanen, Teijo |
title |
Reproductive phenology in a Norway spruce seed orchard |
title_short |
Reproductive phenology in a Norway spruce seed orchard |
title_full |
Reproductive phenology in a Norway spruce seed orchard |
title_fullStr |
Reproductive phenology in a Norway spruce seed orchard |
title_full_unstemmed |
Reproductive phenology in a Norway spruce seed orchard |
title_sort |
reproductive phenology in a norway spruce seed orchard |
publisher |
Finnish Society of Forest Science |
publishDate |
2001 |
url |
https://doi.org/10.14214/sf.602 https://doaj.org/article/115920f3b6da44c495807d3462ac4d6b |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
Silva Fennica, Vol 35, Iss 1 (2001) |
op_relation |
https://www.silvafennica.fi/article/602 https://doaj.org/toc/2242-4075 2242-4075 doi:10.14214/sf.602 https://doaj.org/article/115920f3b6da44c495807d3462ac4d6b |
op_doi |
https://doi.org/10.14214/sf.602 |
container_title |
Silva Fennica |
container_volume |
35 |
container_issue |
1 |
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1766144605539008512 |