Rooting response of late summer cuttings taken from Pinus sylvestris half-sib families
One-year-old Pinus sylvestris donor plants were top-pruned in early May, allowing cuttings of three types to develop: shoots from adventitious buds near the top of the plant (T), weaker shoots from adventitious buds emerging further down the stem (M) and shoots from normal buds on branches (B). Cuttings from 46 half-sib families were collected at the beginning of August, treated with indole-butyric acid, immediately inserted in containers with porous substrate and put in a greenhouse, where soil was heated and high air humidity was maintained. The rooting frequency, estimated by counting living plants 10 months after insertion, was 54%. The family variance component for rooting was small and non-significant, while the clone-within-family component was strongly significant and accounted for 21% of the total random variance. Type M and type B cuttings showed significantly better rooting ability than type T cuttings. Including only plants with at least four acceptable shoots in the propagation experiment, 61% of the potential donor plants remained, without loss of any family. If a more restricted selection criterion was applied, including only plants with at least eight acceptable shoots, 21% remained, with a loss of 13 families. It was concluded that rooting ability of P. sylvestris can be brought to a level that could justify its inclusion in a breeding programme. The lack of family variation was also favourable in this respect, as no families were lost owing to low rooting response. However, the number of suitable cuttings produced by the donor plants needs to be increased.
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Document Type: Research Article
Affiliations: The Forestry Research Institute of Sweden, Svalöv, Sweden
Publication date: 01 August 2005