BIO-0014 Lecture 18: Flowers and Pesticides
9 Mar 2017
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Plants are dictated by how long it is in the dark, not the amount of time in the day: exam deals with only short day plants, phytochrome i. ii. iii. iv. In short day plants, phytochrome far red inhibits the growths of flowers in short day plants. Takes 20 seconds for phytochrome red to turn into phytochrome far red: this happens during the day time. To get rid of this inhibitor, it has to be in the dark: this takes a long time, decays the far red during the night. In tobacco it takes 16 hours of darkness to get rid of far red v. The amount of time varies for each plant. If you flash a beam of light during the middle of the night for just. 20-30 seconds: any far red that was decayed becomes far red agains, causes no growth of flowers vi. Chrysanthemum: a short day plant synchronized for the market.
