Endogenous indole-3-acetic acid and ethylene evolution in tilted Metasequoia glyptostroboides stems in relation to compression-wood formation.

Eight-year-old Metasequoia glyptostroboides seedlings were tilted at a 45 degrees angle to induce compression-wood formation on the lower side of the stems. After 2 weeks of treatment, half of the seedlings were sampled and the remaining half were tilted to the opposite orientation to exchange the upper and lower sides and were kept for 2 more weeks until sampled. Cambium-emitted ethylene was analyzed by gas chromatography with flame-ionization detection.

The growth movement in the peduncle of Eichhornia crassipes II.

The peduncle of water hyacinth (Eichhornia crassipes) showed the downward bending within 24 hours after full flowering. Previously it was suggested that the downward bending of peduncle might be induced by the differential growth of the epidermal cells of the portion because of the differential distribution of auxin in the upper side of the bending part of the peduncle. In order to investigate the effect of auxin and gravity on the peduncle bending in Water hyacinth, we examined the growth reaction of peduncle and the effects of plant hormones on the bending of peduncle under simulated microgravity, and the sedimentable amyloplast on earth and three dimensional (3D)-clinostat.