TWIN MUTATIONS IN MEDIUM VARIEGATED PERICARP MAIZE

The Relation between Light Variegated and Medium Variegated Pericarp in Maize.

HE present report is based upon a restudy of variegated pericarp in Tmaize, a mutable character which is well known through the important pioneer work of EMERSON (1914, 1917, 1929). The current investigation is concerned primarily with the relation between two distinct phenotypes, light variegated and medium variegated, both of which are unstable, The results obtained, however, bear directly on...

The Frequency of Somatic Mutation in Variegated Pericarp of Maize.

Frequency of reconstitution of the variegated pericarp allele in maize.

SELF-RED pericarp (P) in maize arises as a mutant from variegated pericarp (PrrMp) by the transposition of Modulator ( M p ) away from the P locus, where it represses Prr action, to another chromosome site. Evidence summarized in the preceding article (ORTON and BRINK 1966) showed that occasionally the variegated allele is reconstituted in a Prr plant hemizygous for such a transposed Modulator ...

A Stable Somatic Mutation to Colorless from Variegated Pericarp in Maize.

OLORLESS pericarp and cob is one of the least frequent mutant phenotypes C among the offspring of maize plants carrying the somatically unstable variegated pericarp allele, PV. BRAWN (1956) , for example, found only eight mutations to colorless pericarp and cob in contrast to 125 to red pericarp and cob(P") among 4575 offspring from the mating homozygous variegated times standard colorless (P""...

Movement of modulator in maize: a test of an hypothesis.

A model of Modulator movement (Greenblatt 1968) from one chromosomal site to another requires that all movements produce potential twin mutations within the affected cell lineage. From this model the prediction would be that (1) untwinned red and untwinned light-variegated sectors within the pericarp of medium-variegated maize must occur in equal frequency even though partners become lost, duri...