Main content

Evaluation of postharvest quality of iceberg lettuce by chlorophyll fluorescence and firmness

Show simple item record

dc.contributor.advisor DeEll, Jennifer
dc.contributor.advisor Murr, Dennis
dc.contributor.author Schofield, Rex Andrew
dc.date.accessioned 2021-04-19T14:27:12Z
dc.date.available 2021-04-19T14:27:12Z
dc.date.copyright 1999
dc.identifier.uri https://hdl.handle.net/10214/25035
dc.description.abstract Differing cultivar tolerances and responses to stress during growth are hypothesized to influence the photosynthetic apparatus and storage quality of iceberg lettuce. Hence chlorophyll fluorescence was measured as an indicator of the storage potential at harvest. Chlorophyll fluorescence (FV/F M, qP, [Phi]PSII, and qN) invariably indicated that the photosynthetic efficiency of 'Salinas' was superior to 'Ithaca'. However, after 14 and 21 days at 6°C, superior quality was attributed to either cultivar, depending upon the harvest. Apparently, photosynthesis was only marginally influenced by preharvest stresses affecting storage potential, and cultivar differences in inherent photosynthetic capacity masked stress effects. In a second study, chlorophyll fluorescence did not detect ethylene-induced stress of lettuce leaves held at 6°C for 11 days, even when stress symptoms (russet spotting) were visible, suggesting the photosynthetic apparatus is insensitive to ethylene stress. A new instrument-based deformation test was found to correlate highly with the traditional method of firmness evaluation of iceberg lettuce.
dc.language.iso en
dc.subject iceberg lettuce
dc.subject postharvest quality
dc.subject chlorophyll fluorescence
dc.subject firmness
dc.subject storage quality
dc.title Evaluation of postharvest quality of iceberg lettuce by chlorophyll fluorescence and firmness
dc.type Thesis
dc.degree.name Master of Science
dc.degree.department Department of Plant Agriculture
dc.rights.license All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.


Files in this item

Files Size Format View
Schofield_RexA_MSc.pdf 6.208Mb PDF View/Open

This item appears in the following Collection(s)

Show simple item record