By Robert August Evers, Lawrence M. Page

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1997; R. ). Although these recombinants may be present in low frequency, the preferential amplification and sequencing of a recombinant (if undetected) could produce errors in estimates of phylogeny. Thus, concerted evolution has not homogenized rDNA repeats in all taxa. IGS The intergenic spacer (IGS) (Figs. 10) ranges from roughly 1 to 8 kb in plants (Jorgensen and Cluster, 1988); as noted, much of the length variation in the 18S-26S rDNA traces to this region. Much of the middle portion of the IGS consists of a subrepeat structure, with intraspecific variation in IGS length the result of varying numbers of subrepeats (Fig.

Dvorak. 1982. The wheat ribosomal DNA spacer region: its structure and variation in populations among species. Theoretical and Applied Genetics 63:337-348. Appels, R, and R L. Honeycutt. 1986. rDNA: evolution over a billion years. In DNA Systematics, Vol. II, Plants, ed. S. K. Dutta, pp. 81-135. CRC Press, Boca Raton, Horida. Arnheim, N. 1983. Concerted evolution of multigene families. In Evolution of Genes and Gene Proteins, eds. M. Nei and R K. Koehn, pp. 38-61. Sinauer Associates, Sunderland, Massachusetts.

Hemleben. 1993. Nucleotide sequence of the potato rDNA intergenic spacer. Plant Molecular Biology 21:381-384. , S. H. Strauss, A. D. Doerksen, and R. A. Price. 1992. Extensive variation in evolutionary rate of rbcL gene sequences among seed plants. A 89:7844-7848. Bowe, L. , and C. W. dePamphilis. 1996. Effects of RNA editing and gene processing on phylogenetic reconstruction. Molecular Biology and Evolution 13: 1159-1166. Brown, D. , P. C. Wensink, and E. Jordan. 1972. Comparison of the ribosomal DNAs of Xenopus laevis and Xenopus mulleri: the evolution of tandem genes.

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