(A) Position of the
FIS2 locus on chromosome II. The relative position of
the FIS2 locus and restriction fragment length
polymorphism markers m323, mi227, YUP9D3, YUP11D2, YUP11A7 left (L) and
right (R) ends, and the BAC 26D2 fragment 5BC are shown. (B)
The position of the DsG insertion and the two cDNAs are
shown. Asterisks (∗) mark the locations of the mutations in the three
ethyl methanesulfonate-induced fis2 alleles. E,
EcoRI; B, BamHI. (C)
Complementation of fis2 with the cosmid 18H1. The
silique on the left is from a FIS2/fis2
plant showing a ratio of 50:50 of normal and fis seeds.
On the right is a silique from a FIS2/fis2 plant with
an introduced 18H1 FIS2 segment. The ratio of normal to
fis seeds is now 75:25 as expected for the
complementation of a gametophytic mutation (see data in Table 1).
○, fis seeds; •,
FIS seeds. (D) Southern blot of
Arabidopsis L.er genomic DNA digested
with either BamHI, BglII, or
ClaI and hybridized with the 2.38 kb FIS2
cDNA insert.