Document Type thesis Author Name Gurses, Serdar Abidin URN etd-0114104-133335 Title Role of HFR1 in Shade Avoidance and Phytochrome A Signaling Degree MS Department Chemistry & Biochemistry Advisors Craig D. Fairchild, Advisor Keywords phytochrome shade avoidance microarray HFR1 Date of Presentation/Defense 2004-01-13 Availability unrestricted
Phytochromes are the photoreceptors mainly responsible for the detection of red and far-red (FR) light and the following responses. HFR1 is a basic helix-loop-helix type putative transcription factor involved in Phytochrome A signaling pathway. First we look at the early phenotype of mutant seedlings lacking a functional HFR1 gene and we show that auxin is involved in the increased hypocotyl phenotype of these seedlings. Northern blots and RT-PCRs showed that ATHB-2, a gene involved in shade avoidance is regulated by HFR1 under FR light. Microarray experiments were performed to find the genes that are early targets of regulation by HFR1.
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