1,721,043 research outputs found
The role of the Quaternary environmental changes in shaping the diversity of European trees and shrubs
No full textWhere does the Italian cork oak (Quercus suber L.) come from? A phylogeographic study using chloroplast markers.
No full textGenetic diversity and differentiation in European beech (Fagus sylvatica L.) stands differing in management history
No full textThe impact of forest management on genetic diversity and mating was examined in European beech (Fagus sylvatica L.). Ten beech stands
located in Europe were studied in pair-wise plots, differing in management intensity. The stands were genotyped with four highly polymorphic
microsatellite loci. Comparison for genetic diversity measures between the stands with limited management and the high management-intensity
stands (mostly shelter wood system) revealed no significant differences for allelic richness (A), effective number of alleles (Ae), number of rare
alleles (Arare), neither for observed (Ho) nor expected heterozygosity (He). In all stands a significant excess of homozygotes was found, which is in
agreement with previous isozyme publications. However, the increase in the inbreeding coefficient (Fis) in the stands with limited management was
significantly higher than in the highly managed stands. Expectedly a low, but significant, differentiation among all stands was found (Fst = 0.058)
which still reveals a clear geographic structure.
The results indicate that the shelter wood system has no or minimum impact on the genetic diversity in European beech
Erratum: A RAPD, AFLP and SSR linkage map, and QTL analysis in European beech (Fagus sylvatica L.) (Theoretical and Applied Genetics (2003) DOI:10.1007/S00122-003-1461-3)
No full textStrumenti molecolari per la difesa della biodiversità e tipicità del patrimonio tartuficolo italiano
No full text
Sicily represents the Italian reservoir of chloroplast DNA diversity of Quercus ilex L. (Fagaceae)
No full textPosidonia oceanica meadows of the Italian southern Adriatic Sea display different genetic structure
No full textThe Mediterranean-endemic seagrass Posidonia oceanica (L.) Delile forms meadows of great ecological importance that are currently under high anthropogenic pressures. We investigated the genetic structure of two meadows located in the Adriatic Sea along the coast of Italy. The San Vito-Barletta meadow is located in an unprotect area close to several medium-large towns suggesting that it is more subjected to a wide panel of anthropic
impacts. This meadow displays subpopulation structure and higher genetic/genotypic diversity which may be the consequence of a combination of different anthropic impacts and environmental features. In contrast, the Tremiti Islands meadow is included within a marine protected area away from large cities. Genetic analysis showed that this meadow possesses a monoclonal structure with low genetic/genotypic diversity. Yet, our data indicate that both meadows require specific conservation/restoration policy
A RAPD, AFLP and SSR linkage map, and QTL analysis in European beech (Fagus sylvatica L.)
No full textThe genetic linkage map of European beech
(Fagus sylvatica L.) that we report here is the first to our
knowledge. Based on a total of 312 markers (28 RAPDs,
274 AFLPs, 10 SSRs) scored in 143 individuals from a F1
full-sib family. Two maps (one for each parent) were
constructed according to a “two-way pseudo-testcross”
mapping strategy. In the male map 119 markers could be
clustered in 11 major groups (971 cM), while in the
female map 132 markers were distributed in 12 major
linkage groups (844 cM). In addition, four and one minor
linkage groups (doublets and triplets) were obtained for
the male and female map respectively. The two maps
cover about 82% and 78% of the genome. Based on the
position of 15 AFLP and 2 SSR loci segregating in both
parents, seven homologous linkage groups could be
identified. In the same pedigree we investigated the
association with genetic markers of several quantitative
traits: leaf area, leaf number and shape in 2 different
years, specific leaf area, leaf carbon-isotope discrimination
and tree height. A composite interval-mapping
approach was used to estimate the number of QTLs, the
amount of variation explained by each of them, and their
position on the genetic linkage maps. Eight QTLs
associated with leaf traits were found that explained
between 15% and 35% of the trait variation, five on the
female map and three on the male map
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