Effect of plant growth regulators on the cellular growth and levels of intracellular protein, starch and polyamines in suspension cultures of Pinus taeda - Silveira, Vanildo; Santa Catarina, Claudete; Floh, Eny Iochevet Segal; Handro, Walter; Guerra, Miguel Pedro (Reunion Latinoamericana de Fisiologia Vegetal, 2002)