which in the latter's case may be due to a difference in the genotype used.
Detailed studies to work out the inheritance of the new mutant are being
carried out as are also studies on the potential for utilizing this mutant
for economizing hybrid seed production.
Literature cited:
Rick, C. M. and Dempsey, W. H. 1969. Bot. Gaz. 130:180-86.
Ognyanova, A. 1973. Comples Rendus de l'Academic Agricole Georgi Dimitnov
6(1), 43-48 (From P1. Breed. Abst. (1974) Abstract 2849.
Dorosiev, L. 1970. Geneticai Selekteija 3:103-11.
Whalen, R. H. Linkage relations
of singed.
The seedling mutant singed (sn) is
similar to hairless (hl) in phenotype
but has small, bent trichomes.
Lesley and Lesley (TGC 20:23-24, 1970) placed it on chromosome 5 on the
basis of tests with wt, but there was considerable heterogeneity in their data,
some families showing linkage and others not. This is not surprising in view of
the frequently poor expression of wt. They found independence of sn with tf and
only a weak linkage of sn with mc.
In our tests (see Table 1), we were unable to detect linkage of sn with
the chromosome 5 genes af and tf. The low but significant chi-square for sn-
tf is spurious, since the product ratio indicates 53.5% recombination for
these two genes. Results were likewise negative with all other genes tested
except ah on chromosome 9. The product method gives an estimate of 11%
recombination between sn and ah.
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