Effect of light deprivation on MCCase expression.
A, Changes in MCCase activity in 10-d-old Arabidopsis seedlings, which
were initially grown under constant illumination and then transferred
to darkness for the indicated time period. The data presented are
means ± se from three replicates. B, Western-blot
analysis of MCC-A and MCC-B accumulation in Arabidopsis, which were
initially grown under constant illumination and then transferred to
darkness for the indicated time period. Proteins were extracted from
the samples and aliquots containing equal amounts of protein were
fractionated by SDS-PAGE, followed by western-blot analysis with
antiserum against MCC-A or MCC-B. C, Northern-blot analysis of
MCC-A and MCC-B mRNA abundance in 10-d-old
Arabidopsis seedlings, which were initially grown under constant
illumination and then transferred to darkness for 4 d. Equal
amounts of RNA (30 μg) isolated from each sample were fractionated by
electrophoresis in a formaldehyde-containing agarose gel. The data
presented in B and C were gathered from a single experiment; three
replicates of this experiment gave similar results.