23 research outputs found
Ali moška sterilnost vpliva na kalitev in preživetje potomcev? Primer raziskave na jagodnjakih (Fragaria)
No full textStudies on the parental role on progeny performance have mostly focused on the maternal parent, while less attention was given to the paternal parent. This study investigated the impact of paternal pollen sterility (ranging from 3.1 – to 77.2%) on F1 seed germination and progeny survivorship in Fragaria (strawberry, Rosaceae) using controlled crosses. In crosses within F. vesca ssp. vesca the paternal pollen sterility was not correlated with F1 seed germination (N = 14, p > 0.074) and progeny survivorship (N = 14, p > 0. 0.710). Paternal sterility in crosses between F. vesca ssp. vesca and F. vesca ssp. monophylla did not affect on F1 seed germination (N = 7, p > 0.295) and progeny survivorship (N = 6, p > 0.812). Similarly, no correlation was found between father pollen sterility and F1 seed germination (N = 6, p > 0.924) and progeny survivorship (N = 6, p > 0.215) in crosses between F. vesca ssp. americana and F. vesca ssp. vesca. Furthermore, crossing different maternal plants by pollen of the same paternal plant in all three cross types produced progeny with variable levels of F1 seed germination and survivorship. These results indicate the crucial role of maternal plant on progeny performance and support the general idea of the importance of maternal rather than paternal parent on progeny performance
Critical re-reading of the manuscriptology approach of "Hafez to the effort of Sayeh" (Houshang Ebtehaj)
No full textThe endless story of Hafez's speech in recent century has been done in countless studies and researches and everyone has examined the themes in some way in her words and has published them. One of the topics that was widely studied and researched in the middle years of the last century was the publication of several books on the emendation of Divan-e-Hafez. A group of proofreaders tried to emend Divan-e-Hafez with the help of older versions and sometimes to their own taste and remove the dust of distortions of copyists and scribes from the face of the original verses. One of these researches is the Divan-e-Hafez with the description and margins of Houshang Ebtehaj, which due to the fame and background of its author in the description of some major texts of Persian literature, is worth pondering. Because of Since the publication of this book, several steps have been taken to critique and introduce it, by reading them, the author intends to represent different views on the latest version of Hafez's poems. The purpose of this article is to present various theories about "Hafez to the effort of Sayeh" and also to review these theories to achieve a better understanding of the approach of the corrector of this work. Hence, we have reviewed the research that has been written about this work and have shown this version, has good reasons for introducing itself and can be the closest version to the old version and Hafez
Apomixis, hybridisation, polyploidy and crossability in the genus Fragaria
No full textThe relationship of parental genetic distance with cross success and progeny fitness was investigated in crosses made within diploid Fragaria. The mean values for all three components of success rate of crosses (measured as berry set, achene set and seed germination) at intra- and interspecific levels were not correlated with parental genetic distance. While mean berry set and seed germination at cross types was not affected by parental genetic distance, mean achene set was higher in crosses with intermediate genetic distance and lower in crosses between both more closely and more distantly related taxa, suggesting both inbreeding and outbreeding depression effect on achene set. Three components of progeny fitness (assessed as progeny flowering frequency, berry set and pollen sterility) were strongly correlated with parental genetic distance in both intra- and interspecific crosses. By increasing parental genetic distance, flowering frequency and berry set consistently decreased while pollen sterility increased. Therefore, outbreeding depression has strongly affected all three components of progeny fitness. Marked outbreeding depression was evident on flowering frequency and berry set at very short genetic distances between subspecies, and even within subspecies at forma levels, while it was not evident in pollen sterility of progeny at short genetic distance within subspecies. Highly male sterile plants were found among progeny from crosses within F. vesca ssp. Vesca. As the plants had high levels of berry set, the occurrence of high male sterility among progeny from more closely related taxa could be interpreted as a result of hermaphroditism suppression and evidence of a trend towards gynodioecy in this taxon.EThOS - Electronic Theses Online ServiceGBUnited Kingdo
Natura Sloveniae
No full textVol. 17 No. 1 (2015)Kazalo vsebine
ZNANSTVENIČLANKI/ SCIENTIFIC PAPERS
Houshang NOSRATI, Adam H. PRICE, Pedro GERSTBERGER, Chris C. WILCOCK:Characterizationof an allotriploid strawberry Fragaria× biferaDuchesne (Rosaceae) from Europe. /Karakterizacija alotriploidne jagode Fragaria× biferaDuchesne (Rosaceae) iz Evrope
Lovrenc LIPEJ, Borut MAVRIČ, Domen TRKOV:First records of two Cuthona species (Gastropoda: Nudibranchia) in the Adriatic Sea./Prvi zapis o pojavljanju dveh vrst iz rodu Cuthona(Gastropoda: Nudibranchia) v Jadranskem morju
Philippe THÉOU, Ervis LOCE, Marina ĐUROVIĆ: Results of the pioneer survey of potential bat hibernacula inAlbania (2012–2015). / Rezultati prvih popisov možnih prezimovališč netopirjev v Albaniji (2012-2015)
KRATKAZNANSTVENAVEST / SHORT COMMUNICATION
Primož PRESETNIK &Tea KNAPIČ: First confirmations of the greater noctule bat Nyctalus lasiopterus(Schreber, 1780) presence in Slovenia after more than 85 years. / Prve potrditve prisotnosti velikega mračnika Nyctalus lasiopterus(Schreber, 1780) v Sloveniji po več kot 85 letih.
TERENSKINOTICI/ FIELD NOTES
Anja PEKOLJ, Behare REXHEPI, Tina UREK, Urban DAJČMAN, Katarina DRAŠLER, Anamarija ŽAGAR, Gregor LIPOVŠEK, Marijan GOVEDIČ: First record of the European pond turtle Emys orbicularis (Linnaeus, 1758) near Kočevje, SE Slovenia./ Prva najdba močvirske sklednice Emys orbicularis(Linnaeus, 1758) pri Kočevju, JV Slovenija
Slađana GVOZDENOVIĆ & Nikola ČAVOR: First record of dicephalism in the four-lined snake Elaphe quatuorlineataLacépède, 1789 (Serpentes: Colubridae) from Montenegro./ Prva najdba dvoglavega primerka progastega goža (Elaphe quatorlineata) v Črni Gor
Karakterizacija alotriploidne jagode Fragaria × bifera Duchesne (Rosaceae) iz Evrope
No full textAllopolyploidy has played an important role in the plant evolution. To assess its role in speciation, it is necessary to examine fertility and crossability of hybrids. A hybrid clone of the genus Fragaria with different and complex morphology compared to F. vesca, F. viridis and F. moschata, was detected in Germany (in Bayreuth, Bavaria). The genome size of these plants was measured using flow cytometry and their fertility was tested in experimental crossing. The parental origin of the hybrid was revealed using RAPD approach. From the mean intensity of fluorescence emitted by PI-stained nuclei for F. moschata, F. vesca, F. viridis and the hybrid, triploidy of the hybrid could be indicated. The hybrid shared an 1800bp and 880bp long species-specific RAPDs bands with F. viridis and F. vesca, respectively, indicating them as the parental species of the hybrid. The hybrid did not produce any fruit in selfing, open pollination and when crossed by pollen of F. vesca and F. viridis, all showing female sterility of the hybrid. The hybrid had 78% pollen sterility, however, pollinating F. vesca by pollen of the hybrid produced viable seed and F1 plants, indicating its male fertility. This work shows allopolyploidy role in the evolution and speciation of Fragaria, and may suggest the study site as potential new centre of Fragaria speciation.Alopoliploidija ima pomembno vlogo v evoluciji rastlin. Kljub temu je za potrditev njene vloge pri speciaciji potrebno poznati plodnost in možnost križanja pri hibridih. V Nemčiji (Bayreuth, Bavarska) najden hibridni klon rodu Fragaria izkazuje drugačno in kompleksnejšo morfologijo kot vrste F. vesca, F. viridis in F. moschata, zato smo v analizi njegovega izvora uporabili molekulske pristope. Starševski izvor hibridov smo tako ugotavljali z metodo RAPD. Velikost genoma teh rastlin smo merili s pretočno citometrijo, plodnost hibridov pa smo testirali z eksperimentalnim križanjem. Povprečna intenziteta fluorescence F. moschata, F. vesca, F. viridis in hibrida, merjena s pretočno citometrijo, nakazuje triploidijo hibrida. Delitev 1800 in 880 bp dolgih vrstno specifičnih RAPD pasov z F. viridis in F. vesca pa nakazuje, da sta ti dve vrsti starševski hibridu. Hibrid ni proizvajal plodov pri samooploditvi, odprti oploditvi ali če je bil križan s pelodom F. vesca in F. viridis, kar nakazuje sterilnost ženskih hibridov. Hibridi so imeli 78 % sterilnost peloda, opraševanje F. vesca s pelodom hibrida pa je rezultiralo v viabilnih semenih in F1 rastlinah, kar nakazuje na moško plodnost. Delo kaže na pomen alopoliploidije v evoluciji in speciaciji rodu Fragaria ter nakazuje možnost, da je lokacija študije nov center speciacije za rod Fragaria
Dataset Reproductive fitness & genetic distances in diploid Fragaria
No full textLevels of reproductive fitness & genetic distances in diploid Fragaria: 1) Variations in seven components of postzygotic reproductive fitness (initial fruit (berry) set, seed set, F1 hybrid seed germination, survivorship, flowering, fruit (berry) set and pollen sterility at three hierarchal taxonomic levels: • interspecific crosses level: between F. vesca (ssp. vesca) as maternal parent and four species of F. nubicola, F. viridis, F. daltoniana and F. nipponica; • inter-subspecific level between F. vesca ssp. vesca and F. vesca ssp. americana; • intra-subspecific level within F. vesca ssp. vesca (between F. vesca ssp. vesca, F. vesca ssp. vesca var. alba, and F. vesca ssp. vesca f. monophylla) 2) Variations in reproductive isolation between sympatric & allopatric species pairs: • Sympatry: F. vesca versus F. viridis; • Allopatric: F. vesca versus F. nubicola, F. daltoniana and F. nipponica 3) Genetic distance between diploid Fragaria based on RAPDs Nei's Distance (NTSYS-pc ver. 2.02) & ITS P-distance (using sequence data presented by Potter et al. 2005 in Genbank) in PAUP (ver. 4.0b10, Swofford, 2003)
Relationship between genetic distances and postzygotic reproductive isolation in diploid Fragaria (Rosaceae)
No full textData from: Relationship between genetic distances and postzygotic reproductive isolation in diploid Fragaria (Rosaceae)
No full textStudies of reproductive isolation are important for understanding speciation and species delimitation. We studied seven components of reproductive isolation at different taxonomic and geographical levels and their relationship with genetic distance in diploid Fragaria. Isolation was only evident between different taxa at later stages (post F1 survivorship) not at the earlier ones of fruit and seed set, F1 seed germination and survivorship. Within F. vesca, isolation at the later stages was positively correlated with genetic distance, but this was not found at interspecific levels. The lack of isolation between F. vesca and the other species at the early stages provide the chance for hybrid formation, but high levels of infertility expressed among the offspring can lead to potentially opposing evolutionary outcomes. Within F. vesca, there was evidence of unexpected isolation promoting evolutionary diversification and incipient speciation. Reproductive isolation values between sympatric and allopatric species pairs were similar and indicate a lack of reinforcement in Fragaria. This, combined with the lack of correlation between genetic distance and isolation at interspecific levels shows that genetic distance is not always proportionally correlated with the degree of isolation in plants and suggests that evolutionary processes may be playing differently in plants compared to animals
Characterization of an allotriploid strawberry Fragaria × bifera Duchesne (Rosaceae) from Europe
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