STOCKSCH 100 Lecture Notes - Lecture 20: Ethylene, Pineapple, Electromagnetic Spectrum
30 Oct 2016
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Commercial applications of plant hormones: auxins kill weeds, auxins for root cutting, ethylene for fruit ripening of tomato, ethylene promotes flowering of pineapple. Hormones: present in all living plant tissues in different concentrations, shifts in concentrations trigger response. A question: what is light: the movement of energy through space, light is a for(cid:373) of e(cid:374)ergy, (cid:272)a(cid:374)"t (cid:271)e (cid:272)reated or destroyed, (cid:271)ut it can change to another form, forms of energy include: Properties of light: light travels in straight lines, light consists of photons little packets of energy that move in straight lines until something gets in the way. Tra(cid:448)el i(cid:374) (cid:862)(cid:449)a(cid:448)es(cid:863) (cid:271)ut ha(cid:448)e properties of a (cid:862)parti(cid:272)le(cid:863) as well: wavelength is the distance between peaks, moves very fast 186,000 miles per second. At this speed, it can go around the world 8 times in one second. Properties of light affecting plants: quality wavelengths & color, quantity intensity, durations. Violet has shortest wavelength, red has longest wavelength: colors.
