Abstract
Gibberellin has been shown to induce tension wood in the cherry weeping branch, causing its upright growth. Recent study has shown that the cherry tree grown on three dimensional clinostat, a device that simulates microgravity, grew at random angles, and that the formation of secondary xylem was decreased. These results suggest that in attitude control and morphogenesis of stem in woody plant, secondary xylem formation seriously relates to gravity on earth. The recent study on woody plant reported the possibility that endodermal starch sheath cells and gibberellin may play some role in the gravity perception and the following signal transduction. Space experiment for woody plant is expected to study these problems.
