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Fig. 5. Expression of an auxin and a cell death marker is altered in
acl5. (A,B) Histochemical GUS staining of 7-day-old
ProDR5:GUS (A) and acl5 ProDR5:GUS (B)
seedlings grown in vitro. ProDR5:GUS expression is present
in the developing vessel elements of acl5 hypocotyl but not in the
wild type. (C,D) Histochemical GUS staining in 7-day-old
ProXCP2:GUS (C) and in acl5
ProXCP2:GUS (D) seedlings grown in vitro.
ProXCP2:GUS activity in the immature vessel elements
(arrowheads) of acl5 is indicative of an early onset of the vessel
cell death program. Scale bar: 50 µm.