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Early selection in tree breeding: research experience of Sitka spruce, using farm-field site technique
| Publication Type | Journal Article |
| Year of Publication | 2000 |
| Authors | Dinesh Karki,; Lee, S, J. |
| Journal Title | Bio-technology applications for reforestation and biodiversity conservation. Proceedings of the 8th International Workshop of BIO-REFOR, Kathmandu, Nepal, November 28-December 2, 1999 |
| Pagination | 98-104 |
| Key Words | afforestation; forest plantations; heritability; progeny testing; tree breeding; Picea sitchensis |
| Abstract | Data collected by the Tree Improvement Branch of the Northern Research Station in Scotland were analysed. In retrospective progeny test, 33 polycross families of sitka spruce ( Picea sitchensis ) were planted in a fertile and uniform farm-field site using intensive site preparation and close spacing. The same families had previously been out-planted in 3 forest based sites. Farm-field plantations were of 4 years and forest based plantations were of 8 years. Analysis of the study showed low heritability and weak juvenile-mature correlation for all the measured traits. Families with best performance at younger farm- field sites were not consistently good performers at older forest based sites. A high genotype environment interaction was observed between farm-field site and associated forest based sites. Both farm-field site and forest based sites were far from ideal. The poor site selection is possibly the main reason for the disappointing results. |
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