IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Oxygen availability to the embryo and seed sensitivity to ABA: two related machanisms behind pericarp-imposed dormancy in sunflower (Helianthus annuus)
Autor/es:
BATLLA, DIEGO; MARIA VERONICA RODRIGUEZ; CONSTANZA DOMINGUEZ; BENECH-ARNOLD, ROBERTO
Lugar:
CORRIENTES
Reunión:
Congreso; XXXI Reunión Argentina de Fisiología Vegetal; 2016
Institución organizadora:
SOCIEDAD ARGENTINA DE FISIOLOGÍA VEGETAL
Resumen:
Dormancy displayed by sunflower achenes causesserious problems to the seed industry. In this crop,dormancy can be imposed by pericarp. Thisembryo-covering tissue might be interfering with theentry of oxygen to embryo (i.e., hypoxia) which, inturn, might interfere with the metabolism ofgermination inhibitors (e.g., ABA). We used aninbred line and a commercial hybrid both displayingpericarp-imposed dormancy which is evident athigh incubation temperatures to evaluate the effectof different atmospheric oxygen concentrationscombined with different incubation temperatures oni) germination of achenes and seeds (i.e. withoutpericarp) in both genotypes and ii) sensitivity toABA in seeds of the inbred line. Results indicatedthat, in both genotypes, the germination of achenesdecreased with increasing hypoxia at bothtemperatures. Seeds from the inbred line were verysensitive to hypoxia at 30ºC but not so sensitive at12ºC. Seed sensitivity to ABA in the inbred line alsoincreased with hypoxia and incubation temperature.Instead, seeds from the commercial hybriddisplayed no sensitivity to hypoxia at anytemperature. Embryo sensitivity to hypoxiaexplained the pericarp-imposed dormancy in theinbred line but not in the commercial hybrid. So,there was not a common mechanism behind thistrait.