Unformatted text preview: Activators Plants in particular have responses to environmental signal activators. Many plant growth activities are activated by light, or the absence of light. Phytochrome is a light-sensitive pigment that undergoes a conformational change to trigger signal transduction pathways that affect transcription factors. Phytochrome is involved in flowering of plants, chlorophyll synthesis and etiolation (rapid elongation of cells in the absence of light. Phytochrome is also responsible for signaling anthocyanin production in leaves prior to abscission, which gives the red pigments to leaves in autumn. Chlorophyll synthesis in response to the light activation of phytochrome...
View Full Document
This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.
- Spring '10