Abstract
Among the mobile element systems in maize, the En (Spm) system (En — the regulatory element and I the receptive element — a nonfunctional En) has several interesting aspects of control of gene expression (En and Spm are homologous in structure and activity). One of the alleles arising from the Spm group included the a-m2 8004 allele that has a low spotting pattern and unique ringed areas. The interest in this allele is that Spm or En will induce it to co-express the A phenotype and mutability. Several exceptions of the allele were analyzed. Two are Spm changes and two are I changes. The analysis shows that the heritable changes include I changes that are co-expressed in various grades of color and different degrees of mutability. All these changes occur with I at the locus. The Spm changes also include changes in mutability patterns and a mottling pattern.
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