To investigate if MUCI10 and GT6 are involved in
mucilage biosynthesis, we isolated four muci10and two
gt6 homozygous insertion mutants (Fig. 1B). The
muci10-1 and muci10-2 alleles were shown to be tran-
scriptional knockouts (Fig. 1, C and D). Since we
detected increased GT6 transcript levels in muci10-2
siliques compared with the wild type (Fig. 1C), we
generated a muci10 gt6 double mutant to explore
functional redundancy. The muci10-2 gt6-1 double
mutant only had traces of GT6 transcript, similar to thegt6-1 single mutant, not the elevated levels detected in
the muci10-2 single mutant