Background pollination inPinus sylvestrisseed orchards
作者:
Anni Harju,
Outi Muona,
期刊:
Scandinavian Journal of Forest Research
(Taylor Available online 1989)
卷期:
Volume 4,
issue 1-4
页码: 513-520
ISSN:0282-7581
年代: 1989
DOI:10.1080/02827588909382584
出版商: Taylor & Francis Group
关键词: Pinus sylvestris;seed orchards;background pollination
数据来源: Taylor
摘要:
The proportion of background pollen grains in the seed crops of twoPinus sylvestrisseed orchards in Central Finland was estimated with the aid of multilocus allozyme markers. The orchards studied were more than 30 years old and in full pollen production. For the bulked seed crops of the seed orchard with southern clones the estimated average of background pollination over four years was 26%. There were statistically significant differences between years. No significant heterogeneity in the degree of background pollination between clones was found. Among single ramets there was significant heterogeneity in the estimated contamination rates, but the variation was not related to position in the orchard. For the seed orchard with northern clones the bulked seed crop was studied only for one year and the level of background pollination was found to be 33%.These estimates are fairly high, but lower than for many other orchards. Background pollination at this level will cause losses in expected genetic gains. Part of the seeds from northern orchards will not be adapted to the intended area of use.
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