During the last several years we have examined a large collection of
EMS-induced mutants all of which are disturbed in their endosperm and embryo
development. We have referred to these as defective kernel mutants as a
generalization of the defective seed and germless terms of D. F. Jones
(1920) and M. Demerec (1923) and we have reported on some of their genetic
and morphological characteristics (M. G. Neuffer and W. F. Sheridan, 1980,
Genetics 95:929-944; W. F. Sheridan and M. G. Neuffer, 1980, Genetics 95:945-960).
The defective kernel mutants are designated by the gene symbol dek. Listed
below are 15 dek mutants with their chromosome arm location and certain
other characteristics. These mutants have been referred to in our previous
communications by reference to the E number, a laboratory designation;
this E number is included below.
|Symbol||E No.||Chrom. arm||Mature kernel pheno.||Lethality or seedling phenotype||Culture phenotype||Carot. synth.**||Antho. synth.|
*w, white; gs, green striped. **B, blocked; N, normal; dil, dilute; -, undetermined.
Note that the mutant dek1 (E792) was first described by Neuffer (1977) and designated as clf and was subsequently termed gay by Dooner (MGNL 54:79). Additional details on the above mutants as well as the definitions of the abbreviations used above are presented in Neuffer and Sheridan (1980) and Sheridan and Neuffer (1980).
These 15 mutants are clearly non-allelic inasmuch as they are located on 15 different chromosome arms. Among our collection of defective kernel mutants are many that have been located to these same chromosome arms. Allelism tests are in progress and those mutants that prove to be non-allelic will be given dek number designations, i.e., dek16, dek17, etc.
We have begun to transfer the above dek mutants from the original genetic stocks in which they were isolated to a large-embryo strain (Alexander's high oil) and also to Black Mexican sweet corn. We will be pleased to share these mutants with other investigators.
M. G. Neuffer and William F. Sheridan
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