Lilian Oliveira Machado, Suziane Alves Barcelos, Deise Sarzi Shröder,
*Valdir Marcos Stefenon
This study investigated the phylogenetic signal of the nuclear gene GA20ox1 in seed plants focusing in
the relationship between Monocots and Eudicots. Sequences were obtained from GenBank and analyzed using
the maximum likelihood and the maximum parsimony approaches. A maximum likelihood tree was built using
sequences of the rbcL plastid gene in order to enable comparison of the results. The GA20ox1 gene presents
neutral evolution, levels of homoplasy equivalent to that observed in chloroplast sequences and
generated well-resolved phylogenetic relationships. The relationship between Mocots and Eudicots based
on the GA20ox1 gene was clear resolved, revealing the evolution of both groups. All these characteristics taken
together make the GA20ox1 gene a promissory marker to corroborate as well as to complement and resolve
phylogenetic relationships among species within one to several genera.
