Foi estudada a variabilidade isozimática de sete acessos de picão (Bidens pilosa L, Asteraceae), obtidos nas altitudes de 5,210,475,665,890.1.005 e 1.160 m (acessos A. B, C, D, E. F e G, respeclivamenle). Os frutos desses acessos foram cultivados na altitude de 665 m. sendo estudadas as plantas obtidas. Para as folhas e raízes (plantas com 21 dias), tostaram-se sete sistemas isozimáticos, obtendo três sistemas monomórticos: isocitrato desidrogenaso (IDH), leucina aminopeptidase (LAP) e chiquimato desidrogenase (SKDH); três polimórbcos: fosfatase ácida (ACP), esterase (EST) e peroxidase (PO); e um sem resolução satisfatória: malato desidrogenase (MDH), sendo obtida a melhor resolução para as folhas nos sete sistemas. A análise conjunta dos sistemas ACP, EST e PO permitiu separar individualmente os acessos A, B, D e G. Observou-se que nos acessos extremos (A e G) as variações foram mais marcantes O elevado numero de bandas isozimáticas comuns a todos os acessos (27 das 35 bandas reveladas) pode ler favorecido a adaptação de B. pilosa a diversas altitudes.
Isozyme Characterization of Accesses of Bidens pilosa L. It were studied the variabilities of isozymes of seven accesses of beggarticks (Bidenspilosa L, Asteraceae) obtained at 5. 210, 475. 665. 890, 1.005 and 1.160 m altitudes (accesses A, B, C. D, E, F and G, respectively) These accesses fruits were grown at 665 m altitude, and the obtained plants were studied. For leaves and roots (21 days after emergence) it were tested the isozyme systems From those systems three were monomorphic: isoertrate dehydrogenase (IDH), leucine aminopeptidase (LAP) and shikimate dehydrogenase (SKDH); three were polymorphic, acid phosphatase (ACP), esterase (EST) and peroxidase (PO); and one without a satisfactory resolution, lhat is, the malate dehydrogenase (MDH). A better resolution occurred for leaves in all systems The analysis of the systems ACP, EST and PO together, allowed for separating individually the accesses A, B. D and G. It was observed that variation were more romarkablo in the extreme accesses (A and G). The high number of the isozyme bands which were common to all accessos (27 from 35 revealed bands) may have favoured B. pilosa adaptation to those diverse altitudes.