We analyzed the distribution of 2 repetitive DNAs, i.e. ribosomalDNA (rDNA) and a satellite DNA (satDNA), on the B chromosomesfound in 17 natural populations of the grasshopper Eyprepocnemisplorans plorans sampled around the westernMediterranean region, including the Iberian Peninsula, BalearicIslands, Sicily, and Tunisia. Based on the amount of theserepetitive DNAs, 4 types of B variants were found: B 1 , showingan equal or higher amount of rDNA than satDNA, and 3 othervariants, B 2 , B 24 and B 5 , bearing a higher amount of satDNAthan rDNA. The variants B 1 and B 2 varied in size among populations:B 1 was about half the size of the X chromosome in BalearicIslands, but two-thirds of the X in Iberian populations atAlicante, Murcia and Albacete provinces. Likewise, B 2 wasabout one-third the size of the X chromosome in populationsfrom the Granada province but half the size of the X in thepopulations collected at Málaga province. The widespreadgeographical distribution of the B 1 variant makes it the bestcandidate for being the ancestor B chromosome in the wholewestern Mediterranean region.
|Numero di pagine||5|
|Rivista||Cytogenetic and Genome Research|
|Stato di pubblicazione||Published - 2014|
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