Abstract
Patterns of phenotypic and phenetic variability in sixPortuguese cultivars of chestnut (Castanea sativa Mill.) are evaluated. Morphological characterisationwas based on the quantification of seventeen traits. Varianceanalysis showed significant differences among cultivars, and cultivar× year for all the traits studied, and trees within cultivarsshowed also some significant differences for some of themorphological variables. A significant correlation was obtainedbetween length of the leaf blade and the percentage of unisexual andandrogynic inflorescence with the effective thermal index,accumulated rainfall from April to October and from July to October,or the accumulated temperature below seven during the dormant period.Principal Component and cluster analysis were performed to group thecultivars, according to their similarity coefficients. For molecularcharacterisation, 125 RAPD and 157 ISSR polymorphic markers wereamplified using 28 and 7 primers respectively. High level ofcongruence among the two marker systems (r =90.5%) was obtained from comparison of pheneticsimilarities based on the percentage of shared fragments. ISSRmarkers revealed important advantages over RAPDs, due to a higheffective multiplex ratio (12.5 for ISSR compared with 2.2 forRAPD analysis) and reproducibility. Although morphological andmolecular results are comparable, slight differences are showed incluster analysis UPGMA dendrograms. Molecular analysis explainedhomonym situations among 'Martainha' and'Longal' cultivars in Portugal.
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Goulão, L., Valdiviesso, T., Santana, C. et al. Comparison between phenetic characterisation using RAPD and ISSR markers and phenotypic data of cultivated chestnut (Castanea sativa Mill.). Genetic Resources and Crop Evolution 48, 329–338 (2001). https://doi.org/10.1023/A:1012053731052
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DOI: https://doi.org/10.1023/A:1012053731052