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Showing 1 to 20 of 35 for “"Selfing"”.
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Inbreeding Depression in the Partially Selfing Perennial, Ruellia Humilis
… which have ensured a long history of partial selfing. Previous studies have indicated a loss of hawkmoth pollination in isolated populations of Southwest Missouri resulting in significantly increased levels of self-fertilization. To examine the consequences of self-fertilization, comparisons …
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Quantitative Genetic Evaluation of Full Sib-Mating and Selfing as Methods of Inbreeding in Zea Mays (L.)
Made available in DSpace on 2014-12-12T00:17:53Z (GMT). No. of bitstreams: 1 7317164.pdf: 3548673 bytes, checksum: cf219857ddf916ab88d13f73b21d3fe7 (MD5) Previous issue date: 1972
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Impact of self-fertilization on fecundity, the timing of first reproduction, and population genetic structure: Is a mate worth the wait?
… high inbreeding depression with low levels of selfing, or low inbreeding depression and high levels of selfing. This study tests for inbreeding depression in an apparent self-compatible, hermaphroditic marine nemertean worm, Prosorhochmus americanus. Fecundity and timing to first reproduction …
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Characterizing Deleterious Genomic Mutations in Simulated Populations Under Some Biologically Realistic Situations
… infinite. In many plant and animal populations, selfing or outcrossing is often incomplete in that a proportion of populations undergoes inbreeding while the rest undergoes outcrossing. In addition, the degree of deviation of populations from M-S balance is often unknown. Through computer …
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Variation in breeding systems and consequences for reproductive traits in Erica
… floral traits with a shift from outcrossing to selfing. The aim of this thesis was to determine whether similar changes occur in Erica. I thus analysed breeding systems in Erica in relation to floral traits, pollinators, and fire survivals strategies. Seed and fruit set data obtained from …
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Evolution of floral and mating system variation in Camissoniopsis cheiranthifolia (Onagraceae): An evaluation of patterns and processes
… with purging of ID in SF populations. Increased selfing appeared to alleviate pollen limitation (PL) because it was associated with higher and less variable fruit set and reduced florivory by a microlepidopteran. However, evidence that florivores preferentially attacked larger flowers was …
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Self-pollination in the genus Erica
… bird pollinated species having a high degree of selfing. The use of a broken anther ring as an indication of visitation and pollination of the flowers was also investigated and it was found that two species are potentially useful in this regard. An inverse relationship between the degree of …
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The Influence of Biogeography and Mating System on the Ecology of Desert Annual Plants
… reproductive strategies in co-occurring selfing and outcrossing desert annuals. Firstly, I tested the abundant center model to determine the role of range position on plant population dynamics. I examined how the geographic and climatic position of 13 desert annuals found at a common …
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Evidence For Reduced Hawkmoth Pollination in Ruellia Humilis
… greater than values reported for other primarily selfing, herbaceous species. Furthermore, contrary to theory, the population with the highest selfing rate would be required to have the greatest inbreeding depression. Therefore, the results are most consistent with a recent reduction in …
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Quantitative Trait Loci, and Use of the Theory for Detecting Favorable Alleles in Maize Genetic Materials
… or backcross to one of the elite inbreds before selfing were indicated.
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Restoration genetics of Murray Mallee and neotropical forests.
… by changing pollination dynamics (e.g. levels of selfing, pollen diversity) and these mating patterns directly influence the genetic makeup of progeny. Tree progeny are predicted to be particularly sensitive to mating pattern changes of their maternal plant since most tree species predominantly …
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Moth pollination, low seed set, and vestigialization of attractive floral traits in Abronia umbellata (Nyctaginaceae)
… to self-compatibility and predominant selfing is the most common evolutionary transition among the flowering plants and traits associated with outcrossing may become reduced across such shifts, potentially through the action of natural selection, especially if pollinators are also …
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An in vitro system for selection and characterization of acifluorfen-tolerant Solanaceous plants
… some changes heritable over 2 generations of selfing, and others due to differences in ploidy.
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The biosystematics of pteridophytes: aspects of morphology and reproductive biology of some epiphytic ferns
… of C. angustifolium undergo intragametophytic selfing. Reproduction in C. phyllitidis is both intergametophytic and intragametophytic. Both genetic load and isozyme data revealed that diploids (C. angustifolium, P. pellucidum, E. alatum and E. crassifolium) reproduced by intergametophytic …
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Computer simulation to guide choice of breeding strategies for maker-aided multiple trait integration in maize
… Ishii and Yonezawa (2007a), a symmetric crossing/selfing schedule for Event Pyramiding was devised for stacking 8/7 events in a target RP. Trait Fixation breeding strategies considered self-pollination and doubled haploidy approaches to achieve homozygosity as well as seed chipping and tissue …
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SELF-INCOMPATIBILITY IN CHEIRANTHUS ALLIONII
… SI system was stable through one generation of selfing. However, no evidence of inbreeding depression on number of seeds per open-pollinated silique was observed. SI levels were independent of open-pollinated fertility levels. The use of heterogeneous material emphasized the advantage of a …
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The Phenotypic Impact of Transgenic Flower Color Variation in Ipomoea quamoclit.
… and ova were inferior to red plants’ whether selfing or outcrossing.</p>
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Rodent pollination in Androcymbium latifolium (Colchicaceae)
… flowers self-pollinate, indicating a facultative selfing strategy. Therefore, A. latifolium displays an opportunistic life history attracting rodents to the sugar-rich nectar when other food sources are scarce. This is supported by the observation that the seed set of A. latifolium decreases as …
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GENETIC EFFICIENCY IN TWO LOBLOLLY PINE (PINUS TAEDA L) SEED ORCHARDS
… 0.982, 0.992, and 0.994, respectively. Thus, selfing did not contribute significantly to deviations from genetic efficiency in these orchards.</p><p>Pollen contamination, on the other hand, was found to have a significant impact on genetic efficiency. Unique markers in background stands were …
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Genetic variation in the aphid Pemphigus spyrothecae
… within trees were highly inbred, probably due to selfing between sexuales from the same clone. This finding corresponds with the theory that female-biased sex ratios in P. spyrothecae evolved through local mate competition. There was no evidence for a correlation between inbreeding and population …
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