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dc.contributor.advisor Bartel, Bonnie
dc.creatorLiu, John
dc.date.accessioned 2016-01-25T15:32:58Z
dc.date.available 2016-01-25T15:32:58Z
dc.date.created 2015-12
dc.date.issued 2015-11-23
dc.date.submitted December 2015
dc.identifier.citation Liu, John. "The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance." (2015) Diss., Rice University. https://hdl.handle.net/1911/88094.
dc.identifier.urihttps://hdl.handle.net/1911/88094
dc.description.abstract Nearly all organisms have evolved circadian clocks that allow them to anticipate and prepare for cyclical changes in their environment, such as those associated with the transitions from night to day and between seasons. The plant circadian clock functions nearly cell autonomously, regulating rhythmic behaviors in a variety of processes that range from the transcriptional level up to organismal level. Although great progress has been made in determining how the clock functions in plants, not much is known about the clock’s physiological relevance on particular plant processes. Specifically, the clock influences plant defense against Trichoplusia ni (T. ni), as well as basal rhythmic accumulation of jasmonic acid (JA), a plant hormone involved in the regulation of resistance against insect herbivores such as T. ni and necrotrophic fungi such as Botrytis cinerea (B. cinerea). Additionally, the clock affects the accumulation of glucosinolates, secondary metabolites involved in plant insect resistance, in both Arabidopsis and postharvest cabbage (Brassica oleracea). Here we show that rhythmic accumulation of basal JA may be transcriptionally regulated through clock controlled JA-biosynthesis gene transcript accumulation. Additionally, the clock may influence rhythmic accumulation of gene transcripts involved in JA biosynthesis independently of JA-positive feedback. Furthermore, while SA and JA act antagonistically, we note that decreased SA does not influence differential accumulation of JA-biosynthesis related gene transcripts. We also show that phase-entrainment dependent plant resistance to T. ni is influenced in part by aliphatic glucosinolates. Finally, we demonstrate that postharvest vegetables kept in light/dark cycles maintain appearance, tissue integrity, chlorophyll levels, and glucosinolate levels for longer periods of time when compared to postharvest vegetables stored in constant light or constant dark. Moreover, postharvest plants exhibit improved resistance to B. cinerea when kept under light/dark cycles when compared to constant light storage.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectArabidopsis
circadian clock
jasmonic acid
jasmonates
postharvest
postharvest performance
dc.title The Plant Circadian Clock: Roles in Jasmonate Accumulation and Postharvest Plant Performance
dc.contributor.committeeMember Gustin, Michael
dc.contributor.committeeMember Matsuda, Seiichi
dc.contributor.committeeMember Zhong, Weiwei
dc.contributor.committeeMember Braam, Janet
dc.date.updated 2016-01-25T15:32:58Z
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Biochemistry and Cell Biology
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy


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