Analysis of porphyrin synthesis in
au and yg-2 mutants following incubation
in porphyrin precursors. A, Room-temperature absorption and
fluorescence (inset, excitation at 440 nm) spectra of hexane-washed
acetone extracts from dark-grown wild-type (WT), au, and
yg-2 seedlings incubated in the dark for 20 h in 10
mm ALA. B, Quantitation of Pchlide and Proto IX following
incubation in 10 mm ALA or 10 mm glutamate
(glu). Values are means ± se (n ≥
3). The data for no addition (no add.) are from intact seedlings and
are the same as those shown in Figure 3 (au and
yg-2 only).