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Physiological, biochemical, and molecular mechanisms associated with drought tolerance in agrostis species
Descriptive
TitleInfo
Title
Physiological, biochemical, and molecular mechanisms associated with drought tolerance in agrostis species
Name
(type = personal)
NamePart
(type = family)
Merewitz
NamePart
(type = given)
Emily B.
NamePart
(type = date)
1983-
DisplayForm
Emily Merewitz
Role
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(authority = RULIB)
author
Name
(type = personal)
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Huang
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Bingru
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Bingru Huang
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Advisory Committee
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chair
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Gianfagna
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(type = given)
Thomas
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Thomas Gianfagna
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Advisory Committee
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(authority = RULIB)
internal member
Name
(type = personal)
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(type = family)
Bonos
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(type = given)
Stacy
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Stacy Bonos
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Advisory Committee
Role
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(authority = RULIB)
internal member
Name
(type = personal)
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(type = family)
Da Costa
NamePart
(type = given)
Michelle
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Michelle Da Costa
Affiliation
Advisory Committee
Role
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(authority = RULIB)
outside member
Name
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NamePart
Rutgers University
Role
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(authority = RULIB)
degree grantor
Name
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NamePart
Graduate School - New Brunswick
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(authority = RULIB)
school
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Text
Genre
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theses
OriginInfo
DateCreated
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2012
DateOther
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(type = degree)
2012-05
Place
PlaceTerm
(type = code)
xx
Language
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(type = code)
eng
Abstract
(type = abstract)
Improvement of the drought stress tolerance of plants is necessary due to the widespread incidence of drought damage to crop species. Turfgrasses are susceptible to drought damage and may exhibit symptoms of cellular water loss such as wilting, cessation of growth, and other cellular damages resulting in leaf and root senescence. Creeping bentgrass (Agrostis stolonifera L.) is a high value, drought sensitive turfgrass crop species. The main goals of the research described in this thesis were to evaluate mechanisms responsible for drought tolerance in turfgrasses by evaluating whole-plant, cellular, proteomic, metabolomic, genetic, and genomic regions associated with drought defense responses. Part I will focus on how differential hormonal regulation may affect the drought defense responses in turfgrasses. Plant hormones such as cytokinins (CK) are signaling molecules controlling gene expression and the activity of various biochemical pathways. Differential drought-induced regulation of plant hormones is a primary response to prevent cellular desiccation. Drought injury symptoms have been associated with an inhibition in CK synthesis and maintenance of endogenous CK is associated with alleviation of drought damage. Thus, specific objectives related to the effect of elevated CK content in creeping bentgrass during drought stress on 1) whole-plant physiology 2) proteomic 3) metabolic and 4) genetic responses were evaluated. Elevated CK content in the creeping bentgrass plants was achieved by drought induced expression of an ipt transgene encoding the enzyme adenine isopentenyltransferase promoting CK synthesis. The results showed significant modifications of the gene, protein, and metabolite profiles were caused by elevated CK, particularly changes related to energy production, metabolism, and stress defense. Part II will focus on the identification of genomic regions associated with drought tolerance known as quantitative trait loci (QTL). QTL are large genomic regions that are associated with molecular markers and specific plant phenotypes that can be used in plant breeding strategies. Knowledge of the location of QTLs can help breeders screen large quantities of germplasm for complex traits such as drought tolerance. QTLs for important drought tolerance traits such as relative water content, cellular membrane stability, indexes of turf quality, leaf area, and chlorophyll content were found.
Subject
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Topic
Plant Biology
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Title
Rutgers University Electronic Theses and Dissertations
Identifier
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ETD
Identifier
ETD_3955
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electronic resource
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application/pdf
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text/xml
Extent
xxii, 313 p. : ill.
Note
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Ph.D.
Note
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Includes bibliographical references
Note
(type = vita)
Includes vita
Note
(type = statement of responsibility)
by Emily B. Merewitz
Subject
(authority = ETD-LCSH)
Topic
Turfgrasses--Drought tolerance
Identifier
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http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000065221
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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Identifier
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doi:10.7282/T39W0DFN
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ETD doctoral
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Rights
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The author owns the copyright to this work.
RightsHolder
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Name
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Merewitz
GivenName
Emily
Role
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RightsEvent
Type
Permission or license
DateTime
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(point = start)
2012-04-14 12:30:46
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Name
Emily Merewitz
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Affiliation
Rutgers University. Graduate School - New Brunswick
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License
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Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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2012-05-31
DateTime
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2014-05-31
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after May 31st, 2014.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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