Life Sciences Commons^™

A Study Of Cell Dimensions, Amyloplast Position And Certain Physiological Responses During Gravitropic Bending Of Dicot Stems, Julianne E. Sliwinski

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

If a plant is positioned horizontally, the elongating region responds by bending upward within 10 to 12 h until it is vertical, forming a 90 bend with the stem below. If a Xanthium strumarium L. (cocklebur) plant is placed horizontally, but restricted to that position for 48 h and then released, the bend to the vertical usually takes place within 10 s, suggesting that bending energy is stored in restricted stems. Some plants that do not bend completely to 90° within 10 s do so within 5 min, and other plants can overshoot the 90 mark by as much …