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Genetic diversity and structure of Silver fir (Abies alba Mill.) at the south-eastern limit of its distribution range / Maria Teodosiu in Annals of forest research, vol 62 n° 2 (June - December 2019)  

Public [article]  inAnnals of forest research > vol 62 n° 2 (June - December 2019) Titre : Genetic diversity and structure of Silver fir (Abies alba Mill.) at the south-eastern limit of its distribution range Type de document : Article/Communication Auteurs : Maria Teodosiu, Auteur ; Georgeta Mihai, Auteur ; Barbara Fussi, Auteur ; Elena Ciocîrlan, Auteur Année de publication : 2019 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] Abies alba [Termes descripteurs IGN] aire de répartition [Termes descripteurs IGN] analyse de groupement [Termes descripteurs IGN] analyse de variance [Termes descripteurs IGN] Carpates [Termes descripteurs IGN] changement climatique [Termes descripteurs IGN] composition d'un peuplement forestier [Termes descripteurs IGN] conservation des ressources forestières [Termes descripteurs IGN] échantillonnage [Termes descripteurs IGN] estimation bayesienne [Termes descripteurs IGN] génétique forestière [Termes descripteurs IGN] indice de diversité [Termes descripteurs IGN] Roumanie [Vedettes matières IGN] Sylviculture Résumé : (auteur) In the Romanian Carpathians, Silver fir covers about 5% of the forest area and is the second most important conifer species. Although there are a number of genetic studies concerning the distribution of genetic diversity of Abies alba in Europe, populations from the south-eastern limit of the distribution range have been studied less. The aim of the present study was to assess the genetic diversity and differentiation in 36 silver fir populations along the Carpathian Mountains in Romania, using seven microsatellites loci. High levels of genetic diversity (He = 0.779 to 0.834 and AR = 11.61 to 14.93) were found in all populations. Eastern Carpathians populations show higher levels of diversity, both in allelic richness and expected heterozygosity and higher degrees of genetic differentiation compared to southern populations. Bayesian clustering analysis revealed the existence of two genetically distinct groups for silver fir populations, one larger cluster which comprises the Inner Eastern Carpathians, Curvature Carpathians, South Carpathians and the Banat Mountains and the second cluster contained most of the North and Outer Eastern Carpathians population. Both AMOVA and Barrier analysis supported genetic differentiation among geographical provenance regions. The high genetic diversity of silver fir populations from the eastern limit of its distribution provide high potential to mitigate the negative effects of climate warming being valuable genetic resources in the context of global change. The distribution pattern of genetic variation at local, regional and country scale could and should be considered for the preservation of the forest genetic resources. Numéro de notice : A2019-613 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.15287/afr.2019.1436 date de publication en ligne : 26/11/2019 En ligne : https://doi.org/10.15287/afr.2019.1436 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94846 [article]

Genetic diversity and breeding of larch (Larix decidua Mill.) in Romania / Georgeta Mihai ; Maria Teodosiu in Annals of forest research, vol 52 n° 1 (January 2009)    

Public [article]  inAnnals of forest research > vol 52 n° 1 (January 2009) . - p. 97-107 Titre : Genetic diversity and breeding of larch (Larix decidua Mill.) in Romania Type de document : Article/Communication Auteurs : Georgeta Mihai, Auteur ; Maria Teodosiu, Auteur Année de publication : 2009 Article en page(s) : p. 97-107 Note générale : Bibliogr. Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] Larix decidua [Termes descripteurs IGN] Roumanie [Termes IFN] amélioration génétique des plantes [Termes IFN] diversité génétique [Vedettes matières IGN] Sylviculture Résumé : (Auteur) "Although it is one of the most important coniferous species, the larch (Larix decidua Mill.) covers a restricted area in Romania, only 0.3% of the forest area, most being represented by artificial stands. The natural area of the larch is fragmented, being concentrated into five genetic centers: Ceahlău, Ciucas, Bucegi, Lotru and Apuseni. The speed of growth, high productivity, high wood quality and resistance to adversities resulted in initiating research on the genetic variability of the larch. In 1978 and 1982 respectively, by means of international collaboration, two series of comparative trials were installed, with Romanian and foreign provenances of larch, totalizing 6 experimental areas. Selection of seed stands followed, and among them, more than 300 plus trees. There have been installed 26 orchards (134 hectares) of which 3 (15 hectares) are interspecific seed orchards (Larix x eurolepis). This paper presents the results obtained over the last years, regarding the continuing larch breeding program; genetic variation of the main characters in multisite provenances comparative trials planted in 1982, evaluation of the genetic parameters in a clonal seed orchard in order to advance to the second generation seed orchard, and a study of the genetic diversity by means of primary biochemical markers. The provenance tests include 24 populations of larch, 13 Romanian and 11 from the following countries: Germany (4), Austria (2), Belgium (1) and the Czech Republic (4). The studied characters are total height, diameter at 1.30 meters, volume/tree, branches characters, stem straightness and survival. At the age of 25 years from planting, the variance analysis reveals significant interpopulation genetic variation for all the studied characters. The expected genetic gain and the genetic parameters, estimated in the Adâncata larch seed orchard, shows that selection on the clones level, in the first generation seed orchard, can be successfully applied, being effective from both genetic and economic point of view. The broad-sense heritability coefficients for diameter breast height (h2 = 0.773), branch thickness (h2 = 0.759), angle of insertion (h2 = 0.775) and stem form (h2 = 0.591) indicate a strong genetic control for these characters. The expected genetic gain by means of selection of the best 10 clones ranges between 16 to 36%, depending on the character considered. The study of genetic diversity, based on the izoenzymatic markers in provenances comparative trials of larch indicates a high level of intrapopulation genetic diversity, especially for populations located in the South of Eastern Carpathians. Regarding the interpopulation genetic diversity, the provenance Ceahlău is significantly different from other surveyed populations. The obtained results provide important information in terms of long-term breeding, conservation of forest genetic resources, and also for reconsideration of this species in forestation works." Numéro de notice : IFN_5776 Nature : Article En ligne : http://www.editurasilvica.ro/afr/52/1/09_Mihai.pdf Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=73499 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000915	PER	Revue	Nogent-sur-Vernisson	Archives périodiques	Exclu du prêt

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