DISPLACED AND TANDEM DUPLICATIONS IN THE LONG ARM OF CHROMOSOME 10 IN MAIZE

H. K. Dooner ¹ and J. L. Kermicle ¹

¹ Laboratory of Genetics, University of Wisconsin, Madison, Wisconsin 53706

Lc, an anthocyanin pigmenting factor mapping somewhat more than one unit distal to R, is borne on a chromosomal segment which is homologous with part of the R-r:standard duplicated segment. Deficiencies and tandem duplications of the R to Lc region arise from exchanges within these obliquely paired homologous segments. The deficiencies are transmitted with a high, although reduced, frequency by the male gametophyte and are homozygous viable. Yet, the R to Lc region is not duplicated either proximal to R or distal to Lc. Thus the Lc-marked segment and either the P- or the S-marked segment of R-r constitute a displaced duplication. Such an arrangement can initiate a tandem and displaced duplication cycle.———No evidence was obtained for fractionation of the compound phenotype conditioned by Lc.

This article has been cited by other articles:

				Z. Swigonova, J. L. Bennetzen, and J. Messing Structure and Evolution of the r/b Chromosomal Regions in Rice, Maize and Sorghum Genetics, February 1, 2005; 169(2): 891 - 906. [Abstract] [Full Text] [PDF]

				P. S. Stinard and M. M. Sachs The Identification and Characterization of Two Dominant r1 Haplotype-Specific Inhibitors of Aleurone Color in Zea mays J. Hered., November 1, 2002; 93(6): 421 - 428. [Abstract] [Full Text] [PDF]

				P. Zhang, S. Chopra, and T. Peterson A Segmental Gene Duplication Generated Differentially Expressed myb-Homologous Genes in Maize PLANT CELL, December 1, 2000; 12(12): 2311 - 2322. [Abstract] [Full Text]

				K. Petroni, E. Cominelli, G. Consonni, G. Gusmaroli, G. Gavazzi, and C. Tonelli The Developmental Expression of the Maize Regulatory Gene Hopi Determines Germination-Dependent Anthocyanin Accumulation Genetics, May 1, 2000; 155(1): 323 - 336. [Abstract] [Full Text]

				J P Radicella, D Brown, L A Tolar, and V L Chandler Allelic diversity of the maize B regulatory gene: different leader and promoter sequences of two B alleles determine distinct tissue specificities of anthocyanin production. Genes & Dev., November 1, 1992; 6(11): 2152 - 2164. [Abstract] [PDF]

				J. L. KERMICLE Probing the Component Structure of a Maize Gene with Transposable Elements Science, June 27, 1980; 208(4451): 1457 - 1459. [Abstract] [PDF]