Graduation date: 2005

A growth chamber experiment was carried out for ten weeks to reduce post-rooting dormancy in juneberry micropropagation. An RCBD with a split plot arrangement and three replicates were used. Plantlets subjected to 750 mg/L GA, 100 mg/L BA, and 250 mg/L GA + 100 mg/L BA recorded the greatest leaf number. Pre-rooted ‘Thiessen’ plantlets recorded the greatest biomass (fresh and dry weight) and root volume. In a second study, a cultivar evaluation was conducted in Absaraka, ND, where ten juneberry cultivars and a native biotype planted were evaluated for plant and fruit characteristics. An RCBD with four replicates was used. The high yielding cultivars for total yield were ‘Thiessen’, ‘Martin’, ‘Parkhill’, ‘Pembina’, ‘Regent’ and Native. ‘Thiessen’, ‘Martin’, and ‘Parkhill’ maintained a significant higher marketable yield. ‘Thiessen’, ‘Regent’, ‘Martin’, ‘Parkhill’ and ‘Northline’ had the largest fruits, while ‘Thiessen’ and ‘Martin’ fruit had the greatest mass.

Svetimžemiais vadinami iš kitų kraštų kilę ir dėl žmonių veiklos į teritorijas, kuriose jie anksčiau neaugo, patekę augalai. Vienas iš tokių adventyvinių augalų yra varpinė medlieva (Amelanchier spicata) Taigi adventyvinių augalų skverbimasis yra nenutrūkstantis, su žmogaus veikla susijęs procesas, todėl galima teigti, jog tokių augalų šalyje ir toliau daugės. Varpinės medlievos (Amelanchier spicata) tyrimai buvo atliekami 2007-2008 m. liepos – rugsėjo mėn. keturiose skirtingose vietovėse, t.y. Antaviliuose, Aukštuosiuose Paneriuose, Žemojoje Veržuvoje ir Antakalnyje. Kiekvienoje vietovėje buvo pasirinktas 10000 m2 plotas. Plotas suskirstytas į 16 laukelių, o vienas laukelis sudarė 625 m2. Šiose vietovėse vertinant antžeminių dalių morfologinius parametrus buvo matuojamas stiebų aukštis, aukštis iki pirmos šakos, skersmuo, nustatomas stiebų brandos amžius bei absoliutus amžius. Tyrimų metu nustatyta, kad tankiausia buvo Antavilių populiacija. Pagal brandos amžiaus grupes visose tirtose populiacijose vyravo vegetatyviniai stiebai. Pagal morfologinius stiebų požymius visos keturios populiacijos skiriasi nedaug. Pagal absoliutųjį amžių daugiausia populiacijose buvo rasta antrų, trečių ir ketvirtų metų amžiaus stiebų, o mažiausiai septyniolikos, aštuoniolikos, devyniolikos ir dvidešimties metų amžiaus stiebų. Tirtose populiacijose morfologinių požymių kitimai priklauso tiek nuo amžiaus, tiek nuo populiacijos tankumo, tiek nuo konkurencijos bei skirtingų aplinkos sąlygų buveinėse... [toliau žr. visą tekstą] / Exotic are the plants originating from the lands and coming due to the human activity to the areas where they never grow before. One of these adventive plants is thicket shadbush (Amelanchier spicata). So, penetration of adventive plants is a continuous process associated with human activities, therefore it can be argued that the number of such plants in the country will continue to grow. Research of thicket shadbush (Amelanchier spicata) was carried out in July - September 2007-2008 in four different areas, namely Antaviliai, Aukštieji Paneriai, Žemoji Veržuva and Antakalnis. The area of 10000 m2 was chosen in each location. The area was then divided into 16 squares, and one square constituted 625 m2. When evaluating the morphological parameters of the ground parts of the plants, the height of stalks, the height to the first branch, the diameter was measured, and the absolute age and maturity age of stalks was determined. It was determined during the research that the densest was Antaviliai population. According to the maturity age groups the vegetative stalks were dominating in all analysed populations. According to morphological stalk features all for populations differ very little. By absolute age, the highest number of plants in the populations was with the second, third and fourth year stalks, and the least number was with stalks of seventeen, eighteen, nineteen and twenty year old. Changes of morphological features in analysed populations depend on age, on the density... [to full text]

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Production and consumption of edible berries are increasing rapidly in the United States, mostly due to their superior flavor profile, and popular diet-related value with their human health relevant bioactives and nutritional benefits. However, bioactive and nutritional qualities, especially human health protective phenolic antioxidants and associated non-communicable chronic disease (NCD) relevant health benefits of berries vary widely among accessions/cultivars and due to different production practices (organic vs conventional). Therefore, the aim of this thesis was to screen and select high phenolic and high antioxidant serviceberry and blackberry accessions/cultivars and to investigate the effect of different weed management and fertilization (organic vs. conventional) practices on phenolic bioactive linked antioxidant and anti-diabetic properties of blackberry using in vitro assay models. Overall, high phenolic-bioactive linked antioxidant and anti-hyperglycemic properties were observed in both serviceberry and blackberry accessions/cultivars and further for blackberry it was significantly higher under organic weed management and fertilization practices.