Biology 2601A/B Lecture Notes - Lecture 16: Nastic Movements, Tropism, Heliotropism
10 Dec 2016
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Senses direction of gravity and reorients itself (top grows away from gravity) Nutation (circumnutation) = circular/elliptical movement of the stem, root, tendril. Climbing vines (passion flower) find something to cling on/wrap around as support. Whipping motion that goes around to try and find something to grab onto and grow. Tightly curled type of growth due to the same movement around it. Plant movement those are the movements in the mimosa. Nutation (rotational) = the sunflower seedling during germination. Mimosa = sensitive plant by touching it can induce leaf closure after a few seconds. Germinating sunflower leaves don"t just grow upwards, they rotate as well. If plants aren"t disturbed by things like wind, they do show inherent movements that we often don"t see because we don"t look at them on these short timescales. Kudzoo the vine that ate the south invasive vine that grows very quickly. Growth movements (kudzoo) are irreversible certain new length in a direction.
