期刊
TREE GENETICS & GENOMES
卷 10, 期 2, 页码 287-296出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11295-013-0682-0
关键词
Picea glauca; Genetic diversity; Microsatellite markers; Silvicultural regeneration practices; Natural old growth; Plantations; Young natural regeneration; Tree improvement selections
资金
- Canada Research Chair Program [CRC950-201869]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN 170651]
- New Brunswick Innovation Foundation (NBIF) Research Assistant Initiative (RAI)
- NSERC
- NBIF RAI
Forest harvesting and renewal practices using clearcut harvesting followed by artificial and natural regeneration (NR) may impact genetic diversity in subsequent forest tree populations. Plantations (PL) and phenotypic selections may exhibit lower genetic diversity than natural old growth (OG) and naturally-regenerated young populations because they may have a narrow genetic base. We used ten (six EST and four genomic) microsatellite loci, to reassess genetic impacts of silvicultural practices in white spruce (Picea glauca), previously assessed by using 51 RAPD markers by Rajora (1999). Allelic diversity at the genomic microsatellite loci was about three times higher than at the EST-derived microsatellite loci. Although the trends for microsatellite genetic diversity among different stands types were similar to that observed for RAPD markers, with natural OG stands showing the highest and tree improvement selections the lowest allelic and genotypic genetic diversity, no significant differences were observed for microsatellite genetic diversity among OG, young NR, PL and open-pollinated progeny of first-generation phenotypic selections (SEL). The inbreeding levels and genetic differentiation among populations within OG, NR and PL were also similar. However, phenotypic selections had somewhat different genetic constitution as they showed the highest genetic distances with OG, NR and SEL. On the other hand, the lowest genetic distances were observed between the OG and NR stands, which also had similar levels of genetic diversity. Our study suggests no significant negative impacts of harvesting and alternative reforestation practices on microsatellite genetic diversity in white spruce and calls for using more than one marker type in assessing the genetic impacts of silvicultural practices in forest trees.
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