Schmidt, Hannelore, and Volker Schmidt Tests of
allelism for ms-15, ms-26, and ms-33.
(Submitted by R. Hagemann)
The male sterile mutants ms-15, ms-26, and ms-33
can be normalized with gibberellic acid (GA3)
(TGC 26:17) so that self-pollination is possible.
Normalized plants genetically homo-
zygous male sterile) were used as the male parents in the following crosses.
It has been reported that ms-15 is localized on chromosome 2 at position 62 (TGC 8:25). The
mutant ms-26 has been localized on chromosome 2 without a detailed determination of its position.
The results of our crosses now prove that ms-15 and ms-26 are allelic.
Although ms-33 is on chromosome 6 and there is no allelism with ms-15 and ms-26, in
offsprings of (2) (4) (5) and (6), some plants with small and markedly reduced anthers occur. This is
not the case in simple heterozygotes of each of the three mutants.
Because in all three mutants the reduced level of GA3 seems to be the cause of anther
reduction and pollen sterility, we assume that there is some interaction between these non-allelic
mutant loci.
Schmidt, Volker Test of allelism for ms-38 and ms-
40. (Submitted by R. Hagemann)
The mode of meiotic degeneration in the male
sterile mutants ms-38 and ms-40 is very similar.
Therefore they have been crossed to test
whether they may be allelic.
The segregation in a 1:1 ratio demonstrates allelism between ms-38 and ms-40.
Stamova, L., and M. Yordanov A new gene for
resistance to Cladosporium fulvum derived
from L. chilense.
As reported previously (TGC 25, 1975) in
progenies of crosses with L. chilense we found
resistance to races of the group C of
Cladosporium fulvum. The genetic studies of
this resistance showed that it is controlled by a single dominant gene.
The factor for resistance originating from L. chilense was compared in tests for allelism with
three other sources of resistance to the same race (2.3.4) - PI 187002 (gene Cf-5) and two Dutch
accessions (63280 and 64316) of L. cheesmanii received from Miss I. Boukema. The Dutch sources
often show after inoculation restricted sterile mycelium, while the line 4 of the cross with L. chilense
indicates complete resistance.
The results from the allelic tests showed that the gene from L. chilense was non-allelic to the
gene Cf-5, as well as to the resistant factors originating from the Dutch accessions of L.
cheesmanii.
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