Physiological control of the embryonic axis elongation during soybean seeds germination

GOSPARINI, CO; MORANDI EN; MONTECHIARINI NH

Corrientes

Simposio; XXXI Reunión Argentina de Fisiología Vegetal; 2016

Sociedad Argentina de Fisiología Vegetal

Soybean seed (Glycine max L Merr.) germinationis an expansive turgor-driven process producedby water uptake and cell wall loosening of thespecific cells located in the elongation zone of theembryonic axes. It does not imply cellular divisionand it is inhibited by Abscisic Acid (ABA).Expansins are cell wall proteins that promote cellwall loosening by inducing pH-dependent cellwall extension and stress relaxation. We isolateda cDNA orthologous sequence to expansinproteins that would be associated with theelongation process in the cells of the elongationzone of soybean axes. Expression studiesdefined the action window for this protein duringgermination. This protein was induced undersuitable germination conditions and repressed inABA. We postulated that ABA inhibitsgermination, at least partially, by controlling themetabolism of expansions.