The transition of proembryogenic masses to somatic embryos in Araucaria angustifolia (Bertol.) Kuntze is related to the endogenous contents of IAA, ABA and polyamines - Farias-Soares, Francine L.; Steiner, Neusa; Schmidt, Éder C; Pereira, Maria L. T; Rogge-Renner, Gladys D; Bouzon, Zenilda L; Floh, Eny Iochevet Segal; Guerra, Miguel Pedro (Acta Physiologiae Plantarum, 2014)