BIO 181 1st Edition Lecture 24Past LectureI. Temperature RegulationCurrent LectureI. HormonesI. HormonesA. Auxins- most famous, deal with growth response to light to and gravitya. positive and negative gravitropism, depends it is in root or stemb. phototropism- plants grow toward lightc. auxin grow opposite, the light causing plants to move toward the light B. Cytotoxins: promote cell division, seen in plants that growing a. foundation roots. Delay downy and aging, so sprayed on produce in stone. C. Gibberellins: spring hormones, spread dormancy wake plants up. a. stimulate flowers and fruit growth D. Ethylene, only one of six hormones that is a gas, a. which is produce by ripen fruit. b. For example when you keep food in an enclosed container it has more concentrated gas helping, trigger abscission E. Abscisic Acid: “ plant stress hormone ” inhibits cell growth, promotes bud and fruit dormancyd. applied to nursery stock to maintain dormancy -opposite effects of gibberellins (ratio of the two important) -involved in opening and closing of stomata (prevents water loss by closing)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Brassinosteroids: prevent flowers from falling off, promotes cell elongation and cell divisionB. Tropisms: growth responses to or away from environmental stimuliphototropism, response to lightgravitropism: response to gravitya. roots grow down( positive gravitropism)b. shoots grows up( negative gravitropism)Thigmotropism: response to contact with solid objectsc. used in climbing vines and other plants for support while growing toward the sunlightd. auxins grow away from the object, causing the plant to grow to the
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