Näytä suppeat kuvailutiedot

dc.contributor.authorNiiniaho, Jonna
dc.date.accessioned2011-11-25T14:16:42Z
dc.date.available2011-11-25T14:16:42Z
dc.date.issued2011
dc.identifier.otheroai:jykdok.linneanet.fi:1189677
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/37005
dc.description.abstractDactylorhiza maculata is a common terrestrial orchid in Finland. It is nectarless and the seed production is relatively high for a deceptive species. The pollinators of D. maculata do not have frequent visits to the flowers, but the species is capable of over 50 % seed capsule production. Geitonogamy is the transfer of self pollen between flowers on the same individual. It is typical that the pollinators of deceptive inflorescences visit only few flowers and have short stays in them, and therefore it is commonly thought that geitonogamy is infrequent among deceptive species. I examined the role of geitonogamy in the seed production of D. maculata. I prevented geitonogamy in male-sterilization experiment by removing the pollinaria in the experiment group, and in hand-pollination experiment I conducted cross-fertilization and self-fertilization (in the form of both geitonogamy and autogamy). When the seeds had matured I calculated the relative seed capsule production in male-sterilization experiment, and estimated the proportions of embryonic seeds in both experiments. From this data I analyzed the differences in fertilization success and seed quality. The seed quality in both experiments was verified with in vitro germination of the seeds. I found that geitonogamy is not a significant reproduction strategy for D. maculata, because self-pollination is a disadvantage that reduces the seed set and the seed quality. One mechanism to prevent geitonogamy is pollinaria bending, a time delay before the freshly withdrawn pollinaria are able to conduct fertilization. In D. maculata this delay is approximately 50 s which is rather long for a deceptive species. The explanation for the high natural seed capsule production of D. maculata might be a fact that probably the species is not deceptive in all means. Longhorn beetles (Cerambycidae) were found to act as beetle pollinators in the study population. The beetles were found to bear large pollinaria loads of up to approximately 30 pollinaria.
dc.format.extent18 sivua
dc.language.isoeng
dc.rightsThis publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.en
dc.rightsJulkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.fi
dc.subject.othergeitonogamia
dc.titleThe role of geitonogamy in the reproduction success of a nectarless dactylorhiza maculata (orchidaceae)
dc.identifier.urnURN:NBN:fi:jyu-2011112511731
dc.type.dcmitypeTexten
dc.type.ontasotPro gradufi
dc.type.ontasotMaster’s thesisen
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Sciencesen
dc.contributor.laitosBio- ja ympäristötieteiden laitosfi
dc.contributor.laitosDepartment of Biological and Environmental Scienceen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.oppiaineEkologia ja evoluutiobiologiafi
dc.contributor.oppiaineEcology and evolutionary biologyen
dc.date.updated2011-11-25T14:16:42Z
dc.rights.accesslevelopenAccessfi
dc.contributor.oppiainekoodi4011
dc.subject.ysoidätys
dc.subject.ysopölytys
dc.subject.ysokämmekkäkasvit
dc.subject.ysoDactylorhiza maculata


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