Types of nastic movement are named with the suffix
-nasty and have prefixes that depend on the stimuli: • Epinasty: downward-bending from growth at the top, for example, the bending down of a heavy flower. •
Hyponasty: upward bending of leaves from growth in the
petiole (leaf stalk) • Photonasty: response to light •
Nyctinasty: movements at night or in the dark • Chemonasty: response to chemicals or nutrients • Hydronasty: response to water •
Thermonasty: response to temperature • Seismonasty: response to shock • Geonasty/gravinasty: response to gravity •
Thigmonasty/seismonasty/haptonasty: response to contact The suffix may come from Greek νάσσω = 'I press', ναστός = 'pressed', ἐπιναστια = 'the condition of being pressed upon'. ==See also==