Effects of S-3307, an Inhibitor of Gibberellin Biosynthesis, on Swelling of Leaf Sheath Cells and on the Arrangement of Cortical Microtubules in Onion Seedlings

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Treatment with S-3307, a newly developed growth retardant, caused swelling of leaf sheaths in 2- to 3-leafed young onion seedlings (Allium ccpa L. cv. SenshLl-Chuko), 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 leafsheath cells,which are normally oriented transversely to the cel1 axis in untreated seedlings, were oriented longitudinally or obliquely in treated seedlings. S-3307 exerted these effects only in seedlings grovvn under long-day conditions, but not under short-day conditions. Simultaneously applied gibberdlin reversed the effect of S-3307 on swelling, indicating that S-3307 acts as an inhibitor of gibberellin biosynthesis in onion seedlings. Endogenous gibberellin seems to play an important role in arranging corticai micro-tubules transversely to the cell axis.
日本植物生理学会の論文