Artículos de revistas
Growth-active gibberellins overcome the very slow shoot growth of Hancornia speciosa, an important fruit tree from the Brazilian ""Cerrado""
Fecha
2009Registro en:
TREES-STRUCTURE AND FUNCTION, v.23, n.6, p.1229-1235, 2009
0931-1890
10.1007/s00468-009-0361-9
Autor
CALDAS, Linda Styer
MACHADO, Luana de Lima
CALDAS, Sarah Christina
CAMPOS, Marcelo Lattarulo
CALDAS, Juliana Araujo
PHARIS, Richard Persons
PEREIRA-NETTO, Adaucto Bellarmino
Institución
Resumen
Shoot elongation of Hancornia speciosa, an endangered tree from the Brazilian savannah ""Cerrado"", is very slow, thus limiting nursery production of plants. Gibberellins (GAs) A(1), A(3), and A(5), and two inhibitors of GA biosynthesis, trinexapac-ethyl and ancymidol were applied to shoots of Hancornia seedlings. GA(1) and GA(3) significantly stimulated shoot elongation, while GA(5) had no significant effect. Trinexapac-ethyl and ancymidol, both at 100 A mu g per seedling, inhibited shoot elongation up to 45 days after treatment, though the effect was statistically significant only for ancymidol. Somewhat surprisingly, exogenous GA(3) more effectively stimulated shoot elongation in SD-grown plants, than in LD-grown plants. The results from exogenous application of GAs and inhibitors of GA biosynthesis imply that Hancornia shoot growth is controlled by GAs, and that level of endogenous growth-active GAs is likely to be the limiting factor for shoot elongation in Hancornia. Application of GAs thus offer a practical method for nursery production of Hancornia seedlings for outplanting into the field.