Low Temperature Induced Signaling and Molecular Responses in Tomato

Liu, Hong

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Description

Title

Low Temperature Induced Signaling and Molecular Responses in Tomato

Author(s)

Liu, Hong

Issue Date

1999

Doctoral Committee Chair(s)

Ort, Donald R.

Department of Study

Biology

Discipline

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

Overnight exposure to chilling in nature can have a long term detrimental effect on chilling-sensitive plants, such as tomato, including a direct effect on photosynthesis. However, plants can regain their photosynthetic efficiency during a recovery period at warm temperature, low light and high humidity. The mechanism by which plants sense the signal of temperature change and eventually show a response remains unknown. A putative model for the temperature signal transduction pathway is proposed, based on the finding of a highly phosphorylated protein (pp34) and two sequentially activated serine/threonine protein kinases during the initial stage of rewarming. By using rubisco activase as a model gene, my study shows that chilling may interfere with the normal expression of photosynthetic genes, by disrupting phosphorylation/dephosphorylation regulatory steps involved in transcription and translation. A diurnal and circadian regulated protein (p35) was purified and its full length cDNA sequence (named dcr) was cloned. Chilling treatment delays the endogenous rhythm of dcr transcripts and that may also associate with interfering specific protein phosphorylation states.

Graduation Semester

1999

Type of Resource

text

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