The Impact of Prohexadione-calcium on Grape Vegetative and Reproductive Development and Wine Chemistry

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dc.contributor.authorLo Giudice, Danielleen
dc.contributor.committeechairWolf, Tony K.en
dc.contributor.committeememberMarini, Richard P.en
dc.contributor.committeememberZoecklein, Bruce W.en
dc.contributor.departmentHorticultureen
dc.date.accessioned2014-03-14T21:36:31Zen
dc.date.adate2002-05-23en
dc.date.available2014-03-14T21:36:31Zen
dc.date.issued2002-05-14en
dc.date.rdate2003-05-23en
dc.date.sdate2002-05-21en
dc.description.abstractProhexadione-calcium (P-ca), as ApogeeTM, was evaluated in 2000 and 2001 for impact to grape vegetative and reproductive development. In 2000, P-ca (250 mg/L) was applied to Seyval, Cabernet Sauvignon, and Cabernet franc (125, 250, and 375 mg/L). P-ca reduced primary shoot growth for all cultivars and decreased cane pruning weight of Seyval. P-ca (375 mg/L) increased Cabernet franc canopy gaps but increased Cabernet Sauvignon lateral leaf area and leaf layer number. P-ca reduced components of yield for all cultivars. In 2001, P-ca (250 mg/L) was applied singularly at weekly intervals to Cabernet Sauvignon clusters and pre and post-bloom to Cabernet franc and Chardonnay canopies. Application at E-L stages 21 and 23 decreased Cabernet Sauvignon fruit set whereas application at E-L stages 26, 27, and 29 reduced berry weight without impacting fruit set. Berry weight reduction correlated to higher color intensity (420+520 nm), anthocyanins, total phenols and phenol-free glycosyl-glucose (PFGG). Cabernet franc vegetative and reproductive development was generally not affected yet treatment increased absorbance at 280, 420, and 520 nm, color intensity, anthocyanins and total phenols. Pre-bloom applications inhibited Chardonnay vegetative development, and reduced components of yield, and fruit chemistry values: hydroxycinnamates, total phenols, flavonoids, PPFG and absorbance at 280 and 320 nm. Post-bloom applications did not affect Chardonnay vegetative or reproductive development, yet increased PFGG. Treatment did not affect Chardonnay wine chemistry but two post-bloom applications increased Cabernet franc wine anthocyanins and total phenols. Wine aroma and flavor triangle difference tests did not indicate significant treatment differences.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05212002-173302en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05212002-173302/en
dc.identifier.urihttp://hdl.handle.net/10919/42768en
dc.publisherVirginia Techen
dc.relation.haspartFinal.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcanopy architectureen
dc.subjectberry sizeen
dc.subjectgibberellin inhibitoren
dc.subjectgrowth regulatoren
dc.titleThe Impact of Prohexadione-calcium on Grape Vegetative and Reproductive Development and Wine Chemistryen
dc.typeThesisen
thesis.degree.disciplineHorticultureen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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