Inhibition of germination of dormant barley (Hordeum vulgare L.) grains by blue light as related to oxygen and hormonal regulation

• DOI: 10.1111/pce.12239
• Publication Date: 2013-11-21T09:54:54Z
• Authors: HAI HA HOANG; JULIEN SECHET; CHRISTOPHE BAILLY; JULIETTE LEYMARIE; FRANÇOISE CORBINEAU
• Keywords: Darkness; Catabolism

Germination of primary dormant barley grains is promoted by darkness and temperatures below 20 °C, but strongly inhibited blue light. Exposure under light at 10 °C for periods longer than five days, results in a progressive inability to germinate the dark, considered as secondary dormancy. We demonstrate that inhibitory effect reinforced hypoxia. The associated with an increase embryo abscisic acid (ABA) content (by 3.5- 3.8-fold) sensitivity both ABA Analysis expression metabolism genes shows mainly strong HvNCED1 HvNCED2 expression, slight decrease HvABA8'OH-1. Among gibberellins (GA) examined, decreases HvGA3ox2, involved GA synthesis, increases GA2ox3 GA2ox5, catabolism, reduces signalling evaluated HvExpA11 expression. Expression dormancy maintenance high low partial reversion green also suggests cryptochrome might be this hormonal regulation.