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.
Worcester Polytechnic Institute
Chemistry & Biochemistry
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Gurses, Serdar Abidin, "Role of HFR1 in Shade Avoidance and Phytochrome A Signaling" (2004). Masters Theses (All Theses, All Years). 94.
phytochrome, shade avoidance, microarray, HFR1, Phytochrome, Transcription factors, Genetic regulation