A COMPENDIUM OF RECIPROCAL TRANSLOCATIONS IN WHEAT

Summary

Wheat  varieties  and  wheat  species  are  frequently differentiated by  reciprocal translocations of inhomologous chromosomes. Therefore,  for several studies the knowledge about interchanges is required. A list was compiled summarizing available data on the presence and number  of translocations, on configurations observed and their frequencies  of occurrence   and  on  involved chromosomes  from   466   wheat combinations. The  modified chromosomes are usually identified after common chromosome studies, intercrossing  and meiotic analysis in F1 hybrids. Among the wheat accessions listed 20.4 % show a non-translocated karyotype, while the remaining show multivalent configurations of the type 1⁴ (51.3 %), 2⁴ (20.4 %), 3⁴ (3.4 %), 4⁴  (0.6 %), 1⁶  (1.7 %), 1⁸ (0.4 %), 1⁴+1⁶ (1.7 %) and 2⁴+1⁶ (1.6 %). The chromosomes 1A, 7B and 2D are most frequently associated with translocations. Between the genomes the B genome exhibits the most interchanges (A = 12.3 %, B = 61.4 %, D = 26.3 %). However, no close correlations were evident between  individual chromosome length (µm), 4C DNA content per chromosome (pg) and the frequency of chromosomes involved in  translocations (r= < 0.4**).

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