Circadian, Light and Low Temperature Regulation of Nitrate Reductase in Tomato

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Plant Biology

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Tucker, Dawn Elizabeth

Contributors dc:contributor

• Ort, Donald R.

• Biology, Plant Physiology

Language dc:language

eng

Identifier

(MiAaPQ)AAI3030485

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/87029