Biology 2601A/B Lecture Notes - Lecture 20: Plant Hormone, Auxin, Kinetin
3 Dec 2016
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Hormone: signaling molecules produced by glands in multicellular organisms transported by the circulatory system to target distance organs to regulate physiology behaviors. Pla(cid:374)ts do(cid:374)(cid:859)t ha(cid:448)e gla(cid:374)ds a(cid:374)d circulatory syste(cid:373), a(cid:374)i(cid:373)als do. They control and coordinate growth and development requires communication between parts of plants => requires phytohormones. Isoprene derived: building block used to make steroids in animals and plants. Amino acid or purine (bases of dna) derived: Same types of molecules are found in plants and animals. Kinetin and zeatin are cytokynins and derieved from purine ring. Indole 3 acetic acid is auxin derieved from tryptophan structure. Yellow color are steroid and steroid like molecules. Overview of phytohormones and their roles (cid:858)tissue(cid:859) is where they are synthesized. Individual types of hormones can have multiple activities in plants. Most of these are involved in multiple different physiological process. Same kinds of hormones have same kind of activities in all plants. Gibberellins were first discovered because fungi make it.
