1. Hellebours niger : systematics, ecology, pollination and production technologyAndrej Šušek, 2021 Opis: The scientific monograph covers the botanical classification of the genus Helleborus L. and the Christmas rose species (Helleborus niger L.), which has undergone numerous changes throughout its botanical history. The Christmas rose is becoming increasingly important in the ornamental plant market. Its characteristic flowering in the coldest months of the year represents a great advantage over many other species of ornamental plants. As the Christmas rose does not require high temperatures to start flowering, its cultivation can be considered affordable and environmentally friendly. The supply of attractive varieties is likely to be one of the key factors that will affect its popularity in the future. The number of genetically improved (bred) varieties is limited on the market, so selective breeding of Christmas rose will become inevitable in the future. The presented results of pollination analyses, related to insect activity, are important for breeding. Observations indicate that the Christmas rose is an entomophilous and a predominantly allogamous species. Knowledge of plant ecology and cultivation technology will also be exceptionally important. In intensive cultivation, the production technology for Christmas roses is still to a large extent incomplete. The monograph includes scientific findings on the ecology and biology of the Christmas rose, its reproductive processes, and the production technology for potted plants. The monograph also presents the results of the study on the effects of beneficial microorganisms (bacteria and endomycorrhizal fungi) on the growth and development of seedlings from in vivo and in vitro environments. The results of the study indicate that biotisation is a useful technology and that inoculation with specific microorganisms has a beneficial effect on growth.
Ključne besede: Christmas rose, Helleborus niger L., systematic, pollination, cultivation, beneficial microorganisms
Objavljeno v DKUM: 28.09.2021; Ogledov: 1261; Prenosov: 143
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2. Vrednotenje sort črnega teloha, selekcioniranih za gojenje v loncihAleks Raščan, 2019, diplomsko delo/naloga Opis: Raziskava v diplomskem delu je bila opravljena v letih 2016 in 2017 na treh sortah črnega teloha (Helleborus niger): ´Praecox´, ´Happy day´ in ´Happy day Royal´. Namen diplomskega dela je bil proučiti morfološke lastnosti teh treh sort, ki so selekcionirane za pridelavo v loncih. Rastline so bile posajene v substrat Klasmann Tonsubstrat in postavljene na plato za gojenje rastlin v loncih v delu, ki je bil dodatno senčen s senčilnimi mrežami. Ugotovili smo, da med proučevanimi sortami črnega teloha obstajajo statistično značilne razlike v morfoloških lastnostih. Povprečno število razvitih listov proučevanih sort se je statistično značilno razlikovalo le ob prvi in drugi meritvi, ob zadnji meritvi pa je bilo število listov enakomerno. Sorta ´Happy day Royal´ je razvila značilno večje liste in tvorila statistično značilno več cvetov v primerjavi s sortama ´Praecox´ in ´Happy day´.
Ključne besede: teloh, Helleborus niger, sorte, morfološke lastnosti
Objavljeno v DKUM: 22.02.2019; Ogledov: 1088; Prenosov: 69
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3. Perspectives of Christmas rose (Helleborus niger L.) genetic improvementAndrej Šušek, 2016, izvirni znanstveni članek Opis: The Christmas rose is becoming a very important ornamental plant on the market. It is relatively new to intensive production technologies. The number of genetically-improved varieties on the market is limited, and many of the old cultivars are no longer available because of slow and economically unfeasible vegetative propagation. In the future, its genetic improvement will probably become inevitable. New cultivars will have to satisfy the specific requirements of the market and producers as well as strict environmental policy. In order to obtain new cultivars it will be necessary to evaluate the existing germplasm and apply an adequate genetic breeding approach. There are seven main possibilities of creating new varieties: the use of natural variation associated with seed germination, population approach based on recurrent selection, individual selection based on specific genetic combinations, the creation of inbred lines and the formation of hybrids, interspecific hybridisation, mutagenesis and genetic engineering. Molecular markers can be very helpful during the breeding process. They can be used in order to study genetic relationships amongst populations, ecotypes, varieties, and hybrids.
Ključne besede: Christmas rose, Helleborus niger, cultivars, breeding perspectives
Objavljeno v DKUM: 14.11.2017; Ogledov: 1480; Prenosov: 377
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4. Pollinators of Helleborus niger in Slovenian naturally occuring populationsAndrej Šušek, Anton Ivančič, 2006, izvirni znanstveni članek Opis: The study is based on documentation and analysis of the major visitors and pollinators of the Christmas rose (Helleborus niger L.) flowers in Slovenian naturally occurring populations. The emphasis was put on 5 groups of insects: bees, bumblebees, large flies, small dipterous flies and pollinators of minor importance. Systematic observations took place in March 2003, at two different locations: on the valley of Bohinjska Bela and on the Peca Mountain. The first location was not far from a rural area, while the second one was in an isolated area, completely in the wild. The analysis of insect activity showed that there were obvious differences in frequency of visits among the insect groups investigated, locations and time of day. In the population of Bohinjska Bela, bees were the most important pollinators, with the highest activity occurred between 10 a.m. and 11 a.m. In the isolated population in Peca the most frequent visitors were small dipterous flies. The study suggests that the Christmas rose is probably an entomophylous (the most important pollinators are insects, such as bees and flies) and predominantly cross-pollinating species. The entomophylous nature appears to be closely associated with the specific botanic characteristics of flowers. Another pollinating agent is probably wind.
Ključne besede: chrismas rose, helleborus niger, wild populations, pollinators, open pollination, cross pollination, population dynamics, plant population
Objavljeno v DKUM: 13.07.2017; Ogledov: 1617; Prenosov: 84
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6. Morphological descriptors of Christmas rose (Helleborus niger L.)Andrej Šušek, 2008, izvirni znanstveni članek Opis: The Christmas rose (Helleborus niger L.) is becoming an important ornamental plant. in the future, a systematic genetic improvement will probably become inevitable and therefore the characterisation of the naturally grown populations and the accessions within germplasm collections will be extremely important for the breeders. We followed the idea that characterisation of genetic materials has to involve highly heritable morphological traits which are important for the selection and are easy for the determination. the study is based on 5-year long observations of the Slovenian and Croatian naturally grown populations and gerplasm collections. The papers describes 72 morphological traits that appear to be at last partly genetically controlled and can be used as descritors of Christmas rose genotypes.
Ključne besede: Christmas rose, Helleborus niger, ornamental plants, morphological descriptors
Objavljeno v DKUM: 10.07.2015; Ogledov: 1857; Prenosov: 33
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10. Umetno opraševanje in viabilnost peloda črnega teloha (Helleborus niger L.)ŠTEFKA GOLEC, 2010, diplomsko delo Opis: Raziskava je bila narejena na črnem telohu (Helleborus niger L.) v letih 2006 in 2007. V naravni populaciji v kraju Doblatina smo proučevali možnost samooprašitve teloha in kaljivost semen samooprašenih rastlin. Analizirali smo semenitev samooprašenih in hibridiziranih rastlin. Z metodo barvanja z acetokarminom smo proučevali vitalnosti peloda glede na dolžino skladiščenja pri temperaturi -9 oC. Za analizo samooprašnosti smo v naravni populaciji izolirali 41 matičnih rastlin. Rastline, ki smo jih ročno samoopraševali, so semenile. Povprečna kaljivost je bila 9,17 %. Največje število semen je bilo 105, najmanjše pa 2 semeni na posamezno obravnavano rastlino. Pri primerjavi semenitve rastlin je bilo ugotovljeno, da hibridizirane rastline tvorijo povprečno težja semena kot samooprašene rastline. Z analizo je bilo ugotovljeno, da obstajajo statistično značilne razlike v viabilnosti peloda, ki smo ga različno dolgo skladiščili.
Ključne besede: opraševanje, semenitev, vznik, viabilnost peloda, črni teloh, Helleborus niger
Objavljeno v DKUM: 13.10.2010; Ogledov: 3371; Prenosov: 207
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