Circadian, Light and Low Temperature Regulation of Nitrate Reductase in Tomato
Tucker, Dawn Elizabeth
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https://hdl.handle.net/2142/87029
Description
Title
Circadian, Light and Low Temperature Regulation of Nitrate Reductase in Tomato
Author(s)
Tucker, Dawn Elizabeth
Issue Date
2001
Doctoral Committee Chair(s)
Ort, Donald R.
Department of Study
Plant Biology
Discipline
Plant Biology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Plant Physiology
Language
eng
Abstract
The similarity in regulation between NR and sucrose phosphate synthase suggested that NR might be subject to low temperature disruptions in its endogenous rhythm as has been demonstrated for SPS in chilling-sensitive species such as tomato. NR regulation is in fact disrupted by low temperatures, however the change is transient and does not alter the phase of the NR endogenous rhythm following the chill. NR rather undergoes a temporary induction of de novo transcription regardless of the time in the circadian cycle that the chilling episode is initiated causing an increase in both NR protein and activity. The untimely depletion of reductant and TCA carbon skeletons as well as accumulations of toxic byproducts of nitrogen assimilation that this would cause is likely to be detrimental to the plant.
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