OTIMIZAÇÃO DO NÚMERO DE PRIMERS EMPREGADOS EM RAPD PARA DETECTAR VARIABILIDADE GENÉTICA ENTRE ACESSOS DE PICÃO-PRETO

Molecular markers such as RAPD (Random Amplified Polymorphic DNA) are among the most widely used because they are easy to apply, quick and with low cost. With this marker it is possible to evaluate the structure and the genetic diversity in weed and crop populations. The objective of this work was to evaluate the viability of primer number otimization of RAPD molecular marker to know the genetic similarity of target populations. The data bank of two different experiments conducted with hairy beggarticks (Bidens pilosa L.) acesses, at Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, were evaluated on the effects of the primer numbers on the genetic variability. It was possible to otimize the primer number used by RAPD marker. When few primers promoted good band formation in each population, large number of prime will be necessary for the adequate estimative of genetic variability.