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Biomedical subjects

E R Sears

Publications and source records attributed to E R Sears.

6 recordsLinked to original sources

Uses of wheat aneuploids.

There is available in wheat a unique series of aneuploids ranging from all 21 possible monosomics to complex types that are simultaneously deficient for one chromosome and duplicate for another. Furthermore, lines with chromosomes from related alien species either added to or substituted for wheat chromosomes are in common cytological use. This contribution condiders the use of this range of material in studies designed to elucidate the evolutionary relationships of the species, in investigations of the genetics of a polyploid with cytological diploidization, and in potential breeding manipulations.

Breeding↗

Studies of isozyme patterns in nullisomic-tetrasomic combinations of hexaploid wheat.

Thirty-eight wheat strains, each nullisomic for one chromosome and tetrasomic for a homoeologous (related) one, were analyzed electrophoretically for 12 different enzymes, and a gene (or genes) for alkaline phosphatase was localized to chromosomes 4B and 4D. The other 11 enzymes showed no significant electrophoretic variation. The fact that the only mutants observed affect the same enzyme favors the concept that rigorous selection operates in the polyploids both to preserve certain types of variants and to eliminate others.

Journal Article↗