Wild or dog rose (Rosa canina L.) is a successful colonizer of various habitats and different soil types and is widely distributed across the Republic of Croatia. In this research, in order to estimate pomological variability in native dog rose populations, four genotypes from four locations in different geographic areas of Croatia were selected and sampled. The genotypes selected were: genotype G1, originating from the continental part of Croatia (Pitomača); genotypes G2 and G3, originating from the Mediterranean part of Croatia (Kukurini and Posedarje, respectively); and genotype G4, originating from the upland part of Croatia (Gračac). Fruits were harvested at optimum harvest dates in 2010 and 2012. Genotype had a significant effect on each studied pomological trait (length, width, geometric mean diameter, sphericity, volume, surface, shape index, weight, flesh weight, flesh ratio and total dry matter content), while year significantly affected all parameters except sphericity and shape index. The highest values for most pomological traits in 2010 and 2012 were found in the G4 and G3 genotypes, respectively. This research highlighted the existence of high variability in pomological traits among dog rose populations in Croatia, which emphasizes the possibility of further breeding and cultivation.
Dog rose (Rosa canina L.) is a cosmopolitan plant species that due to its nutritional, medical and cosmetic values deserves more attention. Dog roses are cultivated in Croatia on very small scale and most of the rose hip used in the domestic processing industry is imported. In this study, three dog rose F1 progeny populations developed from selected plants collected in Korčula, Malešnica and Prigorje Brdovečko, originating from two climatic regions (P1-Mediterranean and P2 and P3-continental) have been studied as a part of a field experiment for two growing seasons, in order to assess the level of genetic variability for pomological and agronomic traits. In addition, genetic variation within and among examined three dog rose populations has been assessed using 6 polymorphic SSR (Simple Sequence Repeats) markers. The highest variability, as well as the most desirable agronomic traits were found within the P3 population, while the lowest ones were present in the P1 population. Most desirable properties and highest values for commercially important traits were detected in the genotype RC29 (P3). Molecular data was sufficient to separate three studied populations but not all individuals within the populations. Through selection and hybridization of perspective genotypes of dog roses from Croatia, it would be possible to create clonally propagated varieties suitable for commercial cultivation.
Rosaceae family is characterized by the large number of genus and species which are of great importance for horticulture. The main goal of this research was to analyze pomological traits in order to determine biodiversity existence between five genotypes (G) of genus Rosa belonging to four different taxons (G1 - Rosa canina L., G2 - Rosa corymbifera Borkh., G3 - Rosa canina L. var. squarrosa A. Rau Rosa squarrosa (A. Rau) Boreau, G4 - Rosa subcanina (Christ.) Vuk., G5 - Rosa corymbifera Borkh) in continental part of Croatia during two years. Genotype had significant effect on all pomological traits, while year and interaction between year and genotype affected the majority of pomological traits. Multivariate discriminant analysis successfully explained 77.48% of total variability. It achieved separation of genotypes G5 and G1 from genotypes G2 and G4 using canonical axis 1 (Can1) (46.74% of total variability mostly influenced fruit length, width, volume, surface, and shape index). Likewise, genotype G2 was separated from genotype G3 by the Can2 axis (30.74% of total variability mostly influenced by fruit mass). Since genotypes G2 and G5 were of the same species (Rosa corymbifera), their separation by Can1 axis indicates notable effect of ecological factors on pomological traits, which was not the case for Rosa canina genotypes (G1 and G3) where no separation occurred, indicating major effect of hereditary factors on studied pomological traits on this species.
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