The data indicate that Cf-2 and Mi are about 10 units apart. They do
not indicate the order since both of the crossovers in line S75-276 were c.
Further tests with larger populations and markers nearer Cf-2 - Mi are
planned. The suggestion that rvt may be remotely located on the long arm of
chromosome 6 is intriguing.
M. P. Alexander (1973)
has shown that in heterozygous
X/X+ plants, the micro-
Pecaut, P. Search of I/I varieties
without the gametophytic factor X.
gametophytes carrying X+ abort. This abortion which reduces the quantity
of pollen may be detrimental to a good fertilization, especially in bad
conditions of pollen production. This defect is to be feared in the I/I+
heterozygous fusarium resistant hybrids since most of them must be X/X+.
The existence of I/I X+/X+ lines has not yet been reported. Beside their
interest for the production of I/I+ hybrids, such lines could be useful to
combine I and other genes located on chromosome 11, as, for example, jointless
or I2.
At first, we have checked pollen abortion of I/I+ hybrids (which,
consequently, were X/X+). Secondly
we have looked for unaborted I/I+
hybrids in order to detect I/I X+/X+ parent lines. Our results indicate
that the variety Campbell 1327 is I/I X+/X+.
Percentage of pollen abortion (aceto-carmine observation of pollen
taken off the stamen 1 or 2 days before anthesis), mean:
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