Relaciones fenéticas entre las especies sudamericanas de Lycium (Solanaceae)

Abstract

THE PHENETIC RELATIONSHIP OF THE SOUTH AMERICAN SPECIES OF LYCIUM WERE INVESTIGATED BY CLUSTER ANALYSIS (UPGMA) AND ORDINATION BY PRINCIPAL COMPONENT ANALYSIS. IN SOUTH AMERICA -AREA REGARDED AS THE CENTER OF ORIGIN OF THE GENUS- ALL THE SECTIONS OF THE GENUS ARE REPRESENTED (LYCIUM, MESOCOPE, SCHISTOCALYZ, AND SCLEROCARPELLUM). NINETY MORPHOLOGICAL CHARACTERS WERE OBTAINED FOR 39 OTUS (30 SPECIES AND 9 VARIETIES). CORRELATION AND DISTANCE PHENOGRAMS SHOWED SOME DIFFERENCES IN THE ASSOCIATION OF TAXA. PRINCIPAL COMPONENT ANALYSES AGREE, IN GENERAL, WITH THE CLUSTERS FORMED IN THE PHENOGRAMS. ALL THE SPECIES ARE SEPARATED IN PARTICULAR BRANCHES. SOME OF THE (E.G. L. REPENS, L. HUMILE, L. SCHREITERI) ARE ALWAYS ISOLATED. SECT. SCLEROCARPELLUM IS WELL DIFFERENTIATED FROM THE OTHER TAXA IN ALL TREATMENTS, AND SECT. SCLEROCARPELLUM IS WELL DIFFERENTIATED FROM THE OTHER TAXA IN ALL TREATMENTS, AND SECT. SCHISTOCALYX IN THE CORRELATION PHENOGRAM AND PRINCIPAL COMPONENT ANALYSES. THE REMAINING SECTIONS (LYCIUM AND MESOCOPE), ALTHOUGH INTERMIXED, FORM SEPARATE CLUSTERS. RESULTS AGREE WITH THE TAXONOMY AND PUTATIVE PHYLOGENY PREVIOUSLY PROPOSED FOR THE GENUS.