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Bio - Chapter 37

Bio - Chapter 37 - Chapter 37 Regulation of Plant Growth...

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Chapter 37 – Regulation of Plant Growth Four factors involved in regulating plant growth o Environmental cues to which plants respond o Receptors that allow a plant to sense environmental cues, such as photoreceptors, molecules that absorb light o Hormones, chemical singals that mediate the effects of the environmental cues including those sensed by receptors o The plant’s genome, which encodes enzymes that catalyze the biochemical reactions of development Hormones – regulatory compounds that act at very low concentrations at sites often distant from where they are produced Photoreceptors – involved in many developmental processes in plants – pigments associated with proteins 37.2 Gibberellins o Gibberellins – plant growth hormone o In germinating barley and other cereal seeds, the embryo secretes gibberellins o Diffuse through the endosperm to a surrounding tissue called the aleurone layer o Trigger alerurone layer to synthesize and secrete enzymes that digest proteins and
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Bio - Chapter 37 - Chapter 37 Regulation of Plant Growth...

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