A review of the genetics ofBetula
作者:
Gösta Eriksson,
Alena Jonsson,
期刊:
Scandinavian Journal of Forest Research
(Taylor Available online 1986)
卷期:
Volume 1,
issue 1-4
页码: 421-434
ISSN:0282-7581
年代: 1986
DOI:10.1080/02827588609382434
出版商: Taylor & Francis Group
关键词: Betula;cytology;crossability;flowering;growth rhythm;height;volume;quality characters;hybridization
数据来源: Taylor
摘要:
The present knowledge on birch genetics is reviewed as regards the fields of cytology, crossability within and between species, flowering, plant growth rhythm, tree growth and quality, and hybridization. Incompatibility occurs but can be partly overcome by crossing at low temperature. Species hybridization was more successful when the female parent was of low ploidy. Crosses within one subsection are not more successful than crosses between subsections. Earliness of male and female flowering can be improved by selection. Flowering is probably polygenically inherited. Clinal variation in north‐south direction occurs for growth rhythm characters, the northern provenances show the earliest growth cessation. Long‐distance transfers northwards or southwards result in reduced growth. The ratio between the family and the population variance components varies with type of character studied and the geographic range of the material studied. Long‐distance crosses within a species or between species do not seem to lead to any hybrid vigour. Definite conclusions must await more comprehensive crossing programs.
点击下载:
PDF (956KB)
返 回