Thesis (Ph.D.)--Memorial University of Newfoundland, 2000. / Restricted until November 2001. Bibliography: leaves 163-198.

Thesis (M.Sc.)--Memorial University of Newfoundland, 2001. / Bibliography: leaves 55-63.

Thesis (PH. D.)--Cornell University, 1911. / "Published as Bulletins 319, 320 and 342 of the Agricultural Experiment Station of the College of Agriculture of Cornell University." eContent provider-neutral record in process. Description based on print version record.

Thesis (PH. D.)--Cornell University, 1911. / "Published as Bulletins 319, 320 and 342 of the Agricultural Experiment Station of the College of Agriculture of Cornell University." Also issued in print.

Thesis (Ph.D.)--Memorial University of Newfoundland, 1999. / Restricted until June 2000. Bibliography: leaves [333]-379.

Thesis (Ph.D.)--University of Melbourne, Institute for Land and Food Resources, 2001. / Typescript (photocopy). Includes bibliographical references.

Tez (Yüksek Lisans) - Süleyman Demirel Üniversitesi, Fen Bilimleri Enstitüsü, Biyoloji Anabilim Dalı, 2007. / Kaynakça var.

Flatpea (Lathyrgs sylvestris L.) is a potentially valuable forage legume but contains high levels of 2,4-diaminobutyric acid (DABA), a compound that can have adverse effects on some animals, including rats and poultry. To increase genetic variability in foliar DABA content and other traits of interest, three approaches were utilized: (1) regeneration of flatpea plants from tissue culture to produce potential somaclonal variants, (2) seed irradiation and screening of potentially mutated progeny, and (3) intercrossing among flatpea accessions. Low-frequency whole plant regeneration of flatpea was obtained from hypocotyl-derived callus cultures. Auxin concentrations above 5.0 µM resulted primarily in root formation without shoots. Conditions for optimum whole plant regeneration were as follows: callus was initiated on a modified Schenk-Hildebrandt low-ammonium medium containing 5.0 µM IAA (indole acetic acid) and 2.5 µM zeatin for callus initiation; after two subcultures, calli were transferred to a regeneration medium containing 0.1 µM IAA and 1.0 µM zeatin. Calli and regenerated root tissue contained 47 and 381 as much DABA as leaf tissue from 'Lathco' flatpea plants, respectively. Initial tests established that the effective range of gamma irradiation for seed treatment was between 10.0 and 17.5 kR. Within this range, reduction in percentage of both seedling height and plant survival was a linear function of dose. Individual M₂ plants that contained reduced levels of DABA were identified. No significant trend in DABA concentration with increasing gamma irradiation was apparent. Flatpea pollination methods were evaluated prior to utilization of intercrossing for inducing genetic variability. Appropriate flower stages for emasculation were determined by in vitro germination of pollen. Lines that produced high numbers of seeds per pollination were identified by crossing in all possible combinations among seven flatpea accessions. Cross-pollinations resulted in significantly higher seed set than selfing. Pollination using caged honeybees was the most efficient method of hybridization. Greater range and coefficient of variation in DABA concentration were observed for flatpea accessions than for intercrossed progeny produced by honeybee pollination. / Ph. D.

Baigiamajame darbe 2012–2013 m. tirta netikrosios miltligės (Peronospora viciae (Berk) Caspary) įtaka skirtingos geografinės kilmės miškinio pelėžirnio (Lathyrus sylvestris L.) cenopopuliacijų morfologiniams ir sėklų produktyvumo rodikliams. Darbo objektas – iš skirtingų Lietuvos rajonų surinktos dvylika miškinio pelėžirnio cenopopuliacijų, augančių vienodos agrotechnikos sąlygomis. Darbo tikslas – įvertinti netikrosios miltligės įtaką skirtingų cenopopuliacijų miškinio pelėžirnio morfologinias ir sėklų produktyvumo rodikliams. Darbo metodai – įvertinti skirtingų miškiniopelėžirnio cenopopuliacijų stiebo aukštis, žiedynų, ankščių, sėklapradžių ankštyje skaičius, ankšties produktyvumo, vieno stiebo sėklų produktyvumas. Atsparumas netikrajai miltligei įvertintas 5 balų sistema, atsparumo įtaka ankščiau išvardintiems rodikliams įvertinta naudojantis programa STATISTIKA 8. Rezultatai. Tyrimo metų duomenimis, miškinio pelėžirnio stiebo aukščiui, žiedynų skaičiui ir ankščių produktyvumui lemiamą įtaką turėjo cenopopuliacijos genotipas ir tyrimo metų meteorologinės sąlygos. Didesnis miškinio pelėžirnio stiebo aukštis teigiamai įtakojo ankščių (r=0,7539) ir sėklų skaičių (r = 0,6223). Stabiliausias iš tirtų rodiklių tyrimo metais buvo sėklapradžių (vid. 12,4 vnt.) skaičius ankštyje (V = 4,7), labiliausi – ankščių (vid. 21,6 vnt.; V = 36,5) ir subrandintų sėklų skaičiaus (vid. 151,1 vnt., V = 39,8) rodikliai. Miškinio pelėžirnio atsparumas netikrajai miltligei įtakojo... [toliau žr. visą tekstą] / Influence of downy mildew (Peronospora viciae (Berk) Caspary) on morfological and seed productivity parameters of different geographical origins flat pea (Lathyrus sylvestris L.) cenopopulations have been investigated in 2012-2013. Subject of the research – 12 flat pea (Lathyrus sylvestris L.) cenopopulations from different geographical origins of Lithuania, grown on equal agrotechnic conditions. Aim of the research – estimate an influence of downy mildew on flat pea morfological and seed produktivity parameters. Methodology – to evaluate stem height, number of inflorescence, pods, ovules per pod and pod productivity, one stalk of seed productivity of different flat pea coenopopulations. Resistance to downy mildew is rated by 5-point scale, impact of resistance on above listed parameters estimated using the statistics program STATISTICA 8. Results. The research data shows, that genotype of coenopopulation and meteorological conditions had a decisive influence on flat pea stem height, number of inflorescences and pod productivity. Height of stem influenced positively pod (r = 0,7539 ) and seed number (r = 0,6223 ). The most stabile from the investigated parameters were number of ovules (mean 12,4 pcs.) per pod (V = 4,7 ), most labile – number of pods (mean 21,6 pcs., V = 36,5 ) and the number of mature seeds (mean 151,1 pcs., V = 39.8). The flat pea resistance to downy mildew influenced such parameters as the number of pods, number ovules in pod and especially stem seeds... [to full text]

Red clover (Trifolium pratense) is currently used as a green fertilizer for agriculture in northern Sweden. However, due to its low resistance against diseases and a minimal benefit to local pollinators, there is a need to find alternative native species that maximize the benefits for pollinators and agriculture. Garden lupin (Lupinus polyphyllus), another legume, is an invasive alien species in Sweden that may affect the behavior of pollinators and therefore the pollination success of local plant species. The main aim of this study was to increase the knowledge of the legumes cow vetch (Vicia cracca), garden lupin, marsh pea (Lathyrus palustris) and red clover by observing their insect visitors and potential pollinators. The work was divided into subproject 1 (delprojekt 1) and subproject 2 (delprojekt 2). Delprojekt 1 studied insect visitation frequencies in one plot where garden lupin, cow vetch and red clover grew together in Burträsk, while delprojekt 2 studied insect pollination effectivity in two plots where one plot (Fäbodsanden) contained only marsh pea and the other plot (Skäret) contained both garden lupin and marsh pea. Data were collected via field observations. In ‘delprojekt 1', both bumblebees and solitary bees showed a significantly higher visit frequency to garden lupin than to cow vetch and red clover. In ‘delprojekt 2’, flies showed a significantly higher pollination effectivity on garden lupin than on marsh pea in Skäret. Both flies and bumblebees showed a significantly higher pollination effectivity on marsh pea in Fäbodsanden than in Skäret. This indicate that visitation frequencies to cow vetch and red clover as well as pollination effectivity on marsh pea may be affected by the presence/absence of garden lupin. For future studies, examples on how to extend the knowledge even further on plant-pollinator interactions are suggested.