The Severe RanGAP Knockdown Mutant TWEED Is Defective in Cell Division and Meristem Cell Identity but Shows No Aberrations in Nucleocytoplasmic Transport.
(A) Expression of PromCyclinB1;1:GUS in 7-d-old Col-0, SILK, and TWEED seedlings. While staining was variable within the TWEED line, TWEED seedlings showed a substantial reduction, and SILK seedlings showed only a slight reduction in GUS staining when compared with Col-0. Seedlings were stained for 4 h. Bar = 100 μm.
(B) WOX5:GFP localization in 7-d-old Col-0, SILK, and TWEED roots stained with FM4-64. TWEED mutant seedlings display weaker WOX5:GFP signal and mispositioned WOX5:GFP expressing cells when compared with Col-0 and SILK mutant seedlings. Bar = 20 μm.
(C) N7-GFP localization in Col-0, SILK, TWEED and inducible Ran1T27N seedlings. N7-GFP is localized to the nucleus in Col-0, SILK, TWEED, and uninduced Ran1T27N seedlings. By contrast, the fluorescent fusion protein accumulated in the cytoplasm in estradiol-induced Ran1T27N seedlings. Bar = 20 μm.