Section 6
Chapter 5,324

Effects of s 3307 e 1 4 chlorophenyl 4 4 dimethyl 2 1 2 4 triazol 1 yl 1 penten 3 ol an inhibitor of gibberellin biosynthesis on swelling of leaf sheath cells and on the arrangement of cortical microtubules in onion allium cepa cultivar senshu choko seedlings

Mita, T.; Shibaoka, H.

Plant and Cell Physiology 25(8): 1531-1540


ISSN/ISBN: 0032-0781
Accession: 005323787

Download citation:  

Treatment with S-3307, a newly developed growth retardant, caused swelling of leaf sheaths in 2- to 3-leafed young onion seedlings, which otherwise showed no swelling even under long-day conditions. Before swelling became evident, changes occurred in the arrangement of cortical microtubules in leaf sheath cells of S-3307-treated seedlings. Cortical microtubules in leaf sheath cells, which are normally oriented transversely to the cell axis in untreated seedlings, were oriented longitudinally or obliquely in treated seedlings. S-3307 exerted these effects only in seedlings grown under long-day conditions, but not under short-day conditions. Simultaneously applied GA reversed the effect of S-3307 on swelling, indicating that S-3307 acts as an inhibitor of GA biosynthesis in onion seedlings. Endogenous GA seems to play an important role in arranging cortical microtubules transversely to the cell axis.

PDF emailed within 1 workday: $29.90