Status, Monitoring and Targets for Breeding Programs USING SEED ORCHARD SEEDS WITH UNKNOWN FATHERS
The natural pollen cloud moving around with the winds in early summer may account for 50 % of pollinations in mature seed orchards with high internal pollen production. The background pollen is genetically different from seed orchard pollen produced by selected plus trees. This may affect the adapta...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.579.4 http://daglindgren.upsc.se/Meetings/Komi05/KomiNilssonContamination.pdf |
| Summary: | The natural pollen cloud moving around with the winds in early summer may account for 50 % of pollinations in mature seed orchards with high internal pollen production. The background pollen is genetically different from seed orchard pollen produced by selected plus trees. This may affect the adaptation of the seed crop and justify a modified use of the seeds, e.g. the best place to use the crop. However, even seeds from young seed orchards without pollen production may usually be useful forest regeneration material and there are reasons to limit or eliminate demands on high internal pollen production when seed orchard clones and contaminating pollen do not differ much in adaptation. Artificial freeze testing seed orchard crops of Scots pine for autumn cold hardening is often performed in Sweden to determine the area of utilization. In the same way the hardiness of the natural pollen cloud can be experimentally estimated using artificial freeze testing of progenies obtained from controlled wind pollination of selected clones. Therefore a number of permanent small clone archives of Scots pine have been established in central and northern Sweden as a basis for evaluating geographical and daily variation in the hardiness of the background pollen cloud. An archive of mobile grafts is also under establishment. One appli- |
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