20.500.12556/DKUM-48493 Reproduktivne značilnosti medvrstnega križanca Sambucus javanica x S. ebulus Reproductive characteristics of the interspecific hybrid Sambucus javanica × S. ebulus V magistrski nalogi smo primerjali glavne morfološke lastnosti listov in reproduktivnih organov starševskih vrst (S. javanica 'ES' in S. ebulus) ter njunega medvrstnega križanca (S. javanica × S. ebulus). Ker je križanec sterilen, je bil eden od pomembnih ciljev raziskati vzroke sterilnosti na nivoju materinskih celic pelodnih zrn. Ugotovili smo, da so nekatere morfološke lastnosti križanca precej podobne morfološkim lastnostim starševskih vrst. Citološka analiza, ki je temeljila na opazovanju kromosomov mikrosporocit, je pokazala, da sta bila oba starša (S. javanica ES in S. ebulus) diploida z 2n = 36, medtem ko smo pri medvrstnem križancu opazili velike variacije v številu kromosomov in nepravilnosti v celični delitvi. Prisotna je bila anevploidija, in sicer od hiper-diploidije do hipo- in hiper-tri- in tetraploidije. Na podlagi citološke analize sklepamo, da je sterilnost medvrstnega križanca posledica anevploidije, ki je povezana z nepravilnostmi v mikro- in makrosporogenezi. In the presented MSci thesis, we compared main morphological and reproductive characteristics of the parental species S. javanica 'EC' and S. ebulus, and their interspecific hybrid (S. javanica × S. ebulus). We also analyzed the reasons of reproductive sterility of the hybrid plants. It was found that some morphological characteristics of the hybrid plants were more similar to one or another parental species, whereas the others varied between the parental species. The cytological analysis based on microsporocytes showed that both parents (S. javanica and S. ebulus EC) were diploids with 2n = 36. The interspecific hybrid plants exhibited various types of aneuploidy (variations of the number of chromosomes such as hypo- and hipper- di-, three- and tetraploidy) as well as abnormalities in cell division. The investigation showed that sterility of interspecific hybrid plants was probably caused by aneuploidy and its association with irregularities in micro- and macrosporogenesis. Sambucus javanica S. ebulus medvrstni križanec bezeg anevploidija Sambucus javanica S. ebulus interspecific hybrid elder aneuploidy true true false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2015-06-24 14:06:44 2015-06-29 10:58:22 2022-05-25 03:07:31 2021-05-08 03:43:37 2015 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 URN:SI:UM:DK:POYATFCE MAG_Zafosnik_Irena_2015.pdf MAG_Zafosnik_Irena_2015.pdf 1 AEBDB8D92C3CC1D1D6137D96690BDC1A b9bd519b3a5703f96ee46a02afef185653c8fd0003c08e89e2e2eaee0bc1a111 b0e09c1b-7c0b-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=72847 Fakulteta za kmetijstvo in biosistemske vede 0 0 0