CYCA3;1, CYCA3;2, and CYCA3;4 Protein Levels Are Dependent on Proteasomal Degradation.

(A) to (F) Histochemical GUS staining of CYCA3;1  _pro  :CYCA3;1-GUS ([A] and [B]), CYCA3;2  _pro  :CYCA3;2-GUS ([C] and [D]), and CYCA3;4  _pro  :CYCA3;4-GUS ([E] and [F]) root tips at 5 DAS after a 24-h treatment with DMSO control ([A], [C], and [E]) or with the proteasome blocker MG-132 ([B], [D], and [F]). The transition zone and the QC are indicated by brackets and arrows, respectively. Roots were stained for 30 min. Scale bars represent 50 µm.