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DNA analysis of clonal structure of an old growth, isolated forest of Cryptomeria japonica in a snowy region

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The regeneration system and clonal structure of Cryptomeria japonica D. Don were investigated in an old growth forest at an altitude of 1420 m, by examining root connections and DNA analysis. The C. japonica at this site was found to regenerate mostly by layering, and we found no clear evidence of regeneration through seedlings. Determining the clonal structure of this stand is much simpler by DNA analysis than by tracing root interconnections. The results of the DNA analysis suggest that all the C. japonica individuals present have close kinship. The study also supported earlier suggestions that the stand is becoming increasingly dominated by a few C. japonica clones with high levels of cold tolerance and good rooting ability. The formation of this type of stand appears to be strongly related to environmental factors such as the mean temperature and snow depth in winter.

À l'aide de l'analyse des jonctions racinaires et de l'ADN, les auteurs ont étudié le mode de régénération et la structure clonale de Cryptomeria japonica D. Don au sein d'une forêt ancienne située à une altitude de 1420 m. Le principal mode de reproduction sur ce site était le marcottage. Les auteurs n'ont pas trouvé de signes évidents de régénération à partir de semis. Il est beaucoup plus simple de déterminer la structure clonale de ce peuplement par analyse de l'ADN qu'en retraçant les jonctions racinaires. Les résultats découlant de l'analyse de l'ADN indiquent que tous les individus répertoriés de C. japonica ont une proche parenté. L'étude supporte également la suggestion antérieure à l'effet que ce peuplement sera progressivement dominé par un faible nombre de clones de C. japonica démontrant une forte tolérance au froid et une bonne aptitude à l'enracinement. La formation de ce type de peuplement paraît être fortement liée à des facteurs environnementaux tels la température moyenne et l'épaisseur du couvert de neige durant l'hiver.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2001-03-01

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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