Genetic and Environmental Effects on Growth, Resin and Rubber Production in Guayule (Parthenium Argentatum, Gray)

Persistent Link:
http://hdl.handle.net/10150/194849
Title:
Genetic and Environmental Effects on Growth, Resin and Rubber Production in Guayule (Parthenium Argentatum, Gray)
Author:
Blohm, Maren Elizabeth Veatch
Issue Date:
2005
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Guayule (Parthenium argentatum Gray) is a rubber producing plant native to the Chihuahuan Desert, which is currently being investigated as a source of hypoallergenic latex. Current efforts are focusing on increasing latex/rubber production in the plant by either manipulating the rubber biosynthetic pathway, altering agronomic practices to take advantage of environmental conditions that increase rubber synthesis, or both. Field and greenhouse studies were conducted to more fully understand the effect of genetic and environmental manipulation on rubber production in guayule. Three guayule breeding lines were transformed in order to increase the availability of the initiators of rubber synthesis. The tissue-culture-derived transgenic plants and their seed-generated progeny were grown in separate field experiments. Transformation with the genes for the initiators of rubber synthesis did not increase rubber concentration or yield. Height and width had high heritability estimates in the transgenic progeny and were the traits most correlated with rubber yield, while rubber concentration was poorly correlated with height and width. Greenhouse studies were conducted to understand why water stress and low night temperatures increase rubber concentration. Water stress increased the contribution of the stems to the total rubber in the plant and increased the bark to wood ratio of the stem. Most rubber is accumulated in the stems and these two effects of water stress contributed to the increased rubber concentration in water-stressed plants. Low night temperature reduced plant growth without a decrease in carbon exchange. Allocation of carbon fixation products to rubber synthesis rather than growth, contribute to the high rubber production under low night temperatures. Contributions from both breeders and agronomists are needed to further improve guayule rubber/latex yield.
Type:
text; Electronic Dissertation
Keywords:
guayule; rubber; heritability; resin; carbon exchange
Degree Name:
PhD
Degree Level:
doctoral
Degree Program:
Plant Science; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Ray, Dennis T.
Committee Chair:
Ray, Dennis T.

Full metadata record

DC FieldValue Language
dc.language.isoENen_US
dc.titleGenetic and Environmental Effects on Growth, Resin and Rubber Production in Guayule (Parthenium Argentatum, Gray)en_US
dc.creatorBlohm, Maren Elizabeth Veatchen_US
dc.contributor.authorBlohm, Maren Elizabeth Veatchen_US
dc.date.issued2005en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractGuayule (Parthenium argentatum Gray) is a rubber producing plant native to the Chihuahuan Desert, which is currently being investigated as a source of hypoallergenic latex. Current efforts are focusing on increasing latex/rubber production in the plant by either manipulating the rubber biosynthetic pathway, altering agronomic practices to take advantage of environmental conditions that increase rubber synthesis, or both. Field and greenhouse studies were conducted to more fully understand the effect of genetic and environmental manipulation on rubber production in guayule. Three guayule breeding lines were transformed in order to increase the availability of the initiators of rubber synthesis. The tissue-culture-derived transgenic plants and their seed-generated progeny were grown in separate field experiments. Transformation with the genes for the initiators of rubber synthesis did not increase rubber concentration or yield. Height and width had high heritability estimates in the transgenic progeny and were the traits most correlated with rubber yield, while rubber concentration was poorly correlated with height and width. Greenhouse studies were conducted to understand why water stress and low night temperatures increase rubber concentration. Water stress increased the contribution of the stems to the total rubber in the plant and increased the bark to wood ratio of the stem. Most rubber is accumulated in the stems and these two effects of water stress contributed to the increased rubber concentration in water-stressed plants. Low night temperature reduced plant growth without a decrease in carbon exchange. Allocation of carbon fixation products to rubber synthesis rather than growth, contribute to the high rubber production under low night temperatures. Contributions from both breeders and agronomists are needed to further improve guayule rubber/latex yield.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjectguayuleen_US
dc.subjectrubberen_US
dc.subjectheritabilityen_US
dc.subjectresinen_US
dc.subjectcarbon exchangeen_US
thesis.degree.namePhDen_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplinePlant Scienceen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorRay, Dennis T.en_US
dc.contributor.chairRay, Dennis T.en_US
dc.contributor.committeememberMcCloskey, William B.en_US
dc.contributor.committeememberMcLaughlin, Steven P.en_US
dc.contributor.committeememberCornish, Katrinaen_US
dc.contributor.committeememberWalsh, Bruceen_US
dc.identifier.proquest1329en_US
dc.identifier.oclc137355055en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.