Genome composition

The wild species form a polyploid series from diploid (2n = 2x=24) to hexaploid (2n = 6x = 72) in which genomes were classified into five groups A, B, C, D and P by Matsubayashi (1991), with a sixth group E recognized in closely related non-tuber-bearing species. Spooner et al. (2004) summarized the putative genome compositions of the polyploid species, but it is clear... 

Bani-Aameur, F.,Lauer, F. I., Veilleux, R. E., Hilali, A. (1991). Genomic composition of 4x-2x hybrids Influence of Solanum chacoense. Genome, 34, 413 20. 

Comparisons of Genome Composition Although not evidence of direct association, the mere presence of combinations of genes in particular genomes can hint at... 

Studies of overall genome composition based on reassociation kinetics (Simpson et ai, 1982 Cox et ai, 1990 Marx et a/., 2000) and analysis of fully sequenced bacterial artificial chromosome (BAC) clones from the 5. mansoni genome project show that platyhelminth genomes contain abundant highly and moderately repetitive sequence (Fig. 2.1). Much of the repetitive DNA comprises two classes of integrated mobile elements class I elements, which include long terminal repeat (LTR) retrotransposons and retroviruses, non-LTR retro-transposons and short interspersed nuclear elements (SINES) and transpose via an RNA intermediate, and class II elements (trans-posons), which transpose as DNA (Brindley et ai, 2003). Additionally, small dispersed or tandemly repeated sequences are common. A wide variety of these sequences have been isolated and characterized from a variety of taxa (Table 2.4). 

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