IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Structural and hormonal components contributing to thermoinhibition in sunflower achenes
Autor/es:
MARIA VERONICA RODRIGUEZ; MELISA CASTRO; CONSTANZA DOMINGUEZ; DIEGO BATLLA
Reunión:
Congreso; 11th Conference of the International Society for Seed Science; 2014
Resumen:
Prolonged seed dormancy in sunflower fruits can be a problem for commercial lines and hybrids when destined for sowing of a new crop. Fruit coat-imposed inhibition of germination in sunflower achenes at high temperature has been related to inhibition of ethylene biosynthesis, a typical germination promoter in this species. Abscisic acid (ABA) has frequently been involved in promotion and maintenance of sunflower embryo dormancy, but this embryo-originated inhibition disappears during post-maturation. We conducted studies with a commercial hybrid that exhibits persistent coat-imposed thermoinhibition (germination is 100% at 10C, and