Effects of Light Availability and Canopy Position on Peach Fruit Quality

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dc.contributor.authorLewallen, Karaen
dc.contributor.committeechairMarini, Richard P.en
dc.contributor.committeememberByers, Ross E.en
dc.contributor.committeememberParrish, David J.en
dc.contributor.committeememberBarden, John A.en
dc.contributor.departmentHorticultureen
dc.date.accessioned2014-03-14T20:34:18Zen
dc.date.adate2000-04-27en
dc.date.available2014-03-14T20:34:18Zen
dc.date.issued2000-04-10en
dc.date.rdate2001-04-27en
dc.date.sdate2000-04-26en
dc.description.abstractTwo experiments were conducted to determine the influence of light on 'Norman' and 'Cresthaven' peach fruit quality characteristics. Of primary interest was the relationship between ground color and flesh firmness. Light levels were manipulated by use of shade cloth, reflective mulch, and aluminum foil. 'Norman' trees, with a randomly chosen half of the canopy covered with 73% shade cloth, had fruit with lower levels of red color, soluble solids concentration (SSC), specific leaf weight, and average photosynthetic photon flux (PPF) than did non-shaded trees. Foil-covered 'Cresthaven' fruit were larger, less firm, and had lower SSC than non-covered fruit. Covered fruit developed yellow but not red color. Position of the fruit within the canopy of the tree also affected fruit quality characteristics. Inside fruit on both 'Norman' and 'Cresthaven' trees were smaller and firmer, had lower SSC, and were less red than fruit from the canopy exterior. The position effect was probably due to the degree of light exposure and not to the distance from the roots. Fruit on the inside of the tree canopies received much lower average PPF than outside fruit. Relationships were evaluated between ground color and firmness for both cultivars. At a given hue angle, fruit developing in high-light environments were firmer than fruit from low-light environments for 'Cresthaven', but the opposite was true for 'Norman'. Therefore, canopy position or the light environment in the vicinity of the developing fruit does not consistently influence the relationship between hue angle on the non-blush side of the fruit, and flesh firmness.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-04262000-13090002en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04262000-13090002/en
dc.identifier.urihttp://hdl.handle.net/10919/31922en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartpart3.pdfen
dc.relation.haspartpart2.pdfen
dc.relation.haspartpart1.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectFirmnessen
dc.subjectLighten
dc.subjectPeachen
dc.subjectPrunus persicaen
dc.subjectFruit Qualityen
dc.subjectGround Coloren
dc.titleEffects of Light Availability and Canopy Position on Peach Fruit Qualityen
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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