Characterization of juvenility and photoperiodic responses of Rudbeckia hirta originating from different latitudes

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dc.contributor.authorBeckwith, Diane Duncanen
dc.contributor.committeechairLyons, Robert E.en
dc.contributor.committeememberBuss, Glenn R.en
dc.contributor.committeememberGrueber, Kevin L.en
dc.contributor.departmentHorticultureen
dc.date.accessioned2014-03-14T21:50:32Zen
dc.date.adate2009-11-24en
dc.date.available2014-03-14T21:50:32Zen
dc.date.issued1991-10-08en
dc.date.rdate2009-11-24en
dc.date.sdate2009-11-24en
dc.description.abstractRudbeckia hirta is a tender perennial or self-sowing annual which is becoming increasingly popular as a garden flower and a component of wildflower meadow mixes. It may also have -considerable potential for use as a potted crop. R. hirta has a defined juvenility period but preliminary unpublished results suggested that plants originating from different latitudes may possess unequal juvenile periods and exhibit dissimilar sensitivities to photoperiod. Seven R. hirta ecotypes originating from latitudes ranging from 30.l0oN to 45.l0oN were exposed to long days (LD) at different leaf numbers to determine juvenile phase length and speed of floral initiation. Ecotypes from northern latitudes had fewer leaves at maturity and, overall, there was a quadratic relationship between latitude of origin and number of days to first flower from start of LD. Once plants were mature, the speed of floral initiation and development also varied among ecotypes.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 77 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11242009-020029en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11242009-020029/en
dc.identifier.urihttp://hdl.handle.net/10919/45987en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.B435.pdfen
dc.relation.isformatofOCLC# 25119718en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.B435en
dc.subject.lcshRudbeckia hirtaen
dc.titleCharacterization of juvenility and photoperiodic responses of Rudbeckia hirta originating from different latitudesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineHorticultureen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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