Biology 2601A/B Lecture Notes - Lecture 22: Mid Day, Xylem, Indole-3-Acetic Acid
6 Mar 2018
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Plants move: example; the mimosa plant, when you touch it, it moves, when sunflowers germinate, they move on their own as they grow. Categories of plant movement: growth movements - irreversible (permanent) Involve the accumulation of new cells: turgor movements - reversible, cells that lose turgor deflate, ex; the mimosa plant is reversible. Terminology of movement: nutation - rotational movement, tropism - directed movement, phototropism, gravitropism - towards the gravity, nastic movement - undirected response towards the stimuli, simply moving in response to the stimulus. Nutation aka circumnutation: circular or elliptical movement, at the ape(cid:454) of the ste(cid:373), root, te(cid:374)dril, et(cid:272) , can be clockwise or counter clockwise, usually species-specific, ex; climbing vines and tulips. Shift in region of most active cell division: purple balls - cells that are dividing, direction of growth is partly driven by allocation of hormones, e. g. auxin - key regulator of cell division and growth.
