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dc.creatorBacon, Terry A
dc.date.accessioned2012-06-07T22:54:49Z
dc.date.available2012-06-07T22:54:49Z
dc.date.created1999
dc.date.issued1999
dc.identifier.urihttps://hdl.handle.net/1969.1/ETD-TAMU-1999-THESIS-B34
dc.descriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.en
dc.descriptionIncludes bibliographical references (leaves 61-67).en
dc.descriptionIssued also on microfiche from Lange Micrographics.en
dc.description.abstractBloom and fruit development patterns, stratification-germination data, and temperature data were examined for a 15-year period of the Texas A&M University Stone Fruit Breeding Program. Additionally, dry weight accumulation patterns of peach [Prunus persica (L.) Batsch] were examined, and percent dry weight of ovule (PDO) was studied as an embryo maturity index for stratification-germination in the breeding program. Differences in bloom times of 5 bloom period (BP) reference cultisms resulted in different temperature regimes experienced during fruit development for each if the cultisms. Mean temperature during 0-50 days after full bloom was the best predictor of length of fruit development period (FDP), and the relationship was strongest in the earliest-blooming cultisms. Lower temperatures experienced by the earliest-blooming cultivar, 'Earligrande' regulated FDP length, resulting in a change in FDP of 4.8 days per IC change. Fruit growth rate for the latest-blooming cultivar, 'Harvester', may have been relatively optimized by higher temperatures, resulting in a change in FDP of only 1 day per IC change. In breeding population genotypes, percent survival of seedlings (PCTS) was best correlated with length of FDP, and to a lesser extent with mean temperatures doing fruit development. Mean temperatures during all of FDP were more highly correlated with PCTS than mean temperatures during any segment of FDP, and the relationship was strongest for genotypes grouped into the latest-blooming BP. Mean PCTS increased with increasing mean temperatures during FDP, but there was a critical demarcation where mean temperature became much more favorable for embryo growth. Mean minimum temperature (MINFDP) >16C, mean maximum temperature (MAXFDP) >27C, and mean temperature during FDP (MFDP) >22C were identified as favorable temperature regimes. Percent dry weight of ovule (PDO) was equivalent to percent dry weight of embryo (PDE) as an index of embryo maturity in the breeding population, and was found to be a better predictor of PCTS than FDP. It was found that percent dry weight of ovule >30 was an acceptable indicator that the seed lot would have PCTS >70.en
dc.format.mediumelectronicen
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherTexas A&M University
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.subjecthorticulture.en
dc.subjectMajor horticulture.en
dc.titleBloom, fruit development, and embryo development of peaches in a mild-winter region, and use of percent dry weight of ovule as a maturity indexen
dc.typeThesisen
thesis.degree.disciplinehorticultureen
thesis.degree.nameM.S.en
thesis.degree.levelMastersen
dc.type.genrethesisen
dc.type.materialtexten
dc.format.digitalOriginreformatted digitalen


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