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Morpho-agronomic characteristics of the interspecific hybrid Cucurbita ficifolia x C. maxima
Anton Ivančič, Metka Šiško, Borut Bohanec, Simona Šiftar, 2004, original scientific article

Abstract: The aim of the investigation was to describe some of the main morpho-agronomiccharacteristics of the interspecific hybrid Cucurbita ficifolia x C. maxima, and to define the traits which can be used for distinguishing this hybrid from the parental species. The hybrid was obtained using emryo-rescue technique. The plants were extremely vigorous and were growing and flowering until the first frost. The ratio male versus was rangingbetween 1:40 and 1:80. Most of the male and female were sterile or partly sterile. The majority of the analysed traits were intermediate regarding the parental species. The most appropriate traits for the determination of the interspecific nature were the leaf margin, the shape and colour of ripe fruits and the shape of fruit stalks. The fruit exterior was extremely hard (similarly to the one of C. ficifolia) and cracked in several places.
Keywords: interspecific hybridisation, Cucurbita ficifolia, Cucurbita maxima, flowering, morphology
Published in DKUM: 10.07.2015; Views: 1275; Downloads: 30
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Genetic and morphologic variability of annual glassworts (Salicornia L.) from the Gulf of Trieste (Northern Adriatic)
Mitja Kaligarič, Borut Bohanec, Biljana Simonovik, Nina Šajna, 2008, original scientific article

Abstract: The genetic variability of four pre-determined morphotypes of Salicornia (S. patula, S. emerici, S. veneta and the "saline type") from 10 locations on the Gulf of Trieste coast were studied by means of ploidy level estimation using flow cytometry and by molecular DNA analysis of ITS regions of nrDNA and cpDNA. Two groups, the diploids and tetraploids, with matching nrDNA sequences, were recognized. Two types of cpDNA emerged among the diploids; one the same as in tetraploids. This incongruence between nrDNA and cpDNA sequences indicates a hybridization with tetraploid maternal progenitors and demonstrates the evidence for reticulate evolution. The morphometry, based on generative morphological traits, did not clearly separate the four morphotypes. However, the most important characters - length of the middle fertile segment, length of the lateral flower, width of the scarious margin of the fertile segment in the floral region, conform to two genetically recognized types: diploid S. patula and the widely distributed tetraploid S. emerici, also comprising the "saline type" and morphotype, known as a charismatic endemic S. veneta, a flagship species for nature conservation. Other discriminative traits for diploid and tetraploid morphotypes are parameters of the flowers (comparison of length of the central vs. lateral flower) and stomatal index. The determination key is also given. The tetraploid S. emerici is by far the most common species of annual glassworts in the area, occupying more extreme habitats than a diploid S. patula, which mostly forms monodominate stands.
Keywords: botany, coastal flora, Gulf of Trieste, morphological variability, Salicornia emerici, Salicornia veneta, Salicornia patula
Published in DKUM: 07.06.2012; Views: 2418; Downloads: 117
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