epinasty

(redirected from epinastic)
Also found in: Dictionary, Medical.

epinasty

[′ep·ə‚nas·tē]
(botany)
Growth changes in which the upper surface of a leaf grows, thus bending the leaf downward.
References in periodicals archive ?
For example, excised tobacco leaf tissues grew more rapidly incubated in auxin over a 20 hour period resulting in epinastic (downward) curvature (2, 3) and one-time application of auxins to expanding common bean (Phaseolus vulgaris) leaves produced transient (multi-hour) hyponasty (upward curvature) due to increased abaxial (underside) cell expansion (3).
Also, excised leaf strips of inter-veinal tissue from tobacco respond to auxin treatment with epinastic growth (4).
The growth is epinastic, unrelated to auxin-induced ethylene production, and strongly developmentally regulated with responsiveness correlating with the cell expansion phase of growth.