Physiological and biochemical characterization of bud dormancy: Evolution of carbohydrate and antioxidant metabolisms and hormonal profile in a low chill peach variety

In this work, we studied the interplay among levels of starch, sugars, abscisic acid (ABA) and bioactive gibberellins (GAs), antioxidant metabolism during bud dormancy release in a low chill peach variety. The experiments were performed two consecutive years geographical areas with different annual media temperature. cold area, plants accumulated more starch soluble sugars than temperate sorbitol sucrose being most abundant sugars. enzymatic activities ascorbate-glutathione (ASC-GSH) cycle ROS-scavengers enzymes superoxide dismutase (SOD), catalase peroxidase (POX) measured. increased activity ASC-GSH POX suggested mild oxidative stress at endodormancy periods. sense, presence H2O2-sensitive enzymes, including Fe-SOD, Cu,Zn-SOD, APX floral buds could trigger signaling leading to release. Interestingly, induction new isoenzyme occurred release, suggesting its use as marker for event varieties. GAs decreased end period, whereas ABA showed strong decline throughout especially from area. As consequence, sharp decrease ABA/GAs ratio was observed, phenomenon closely related This response evident Results that levels, well ratio, may be necessary peach, least Overall, observed an interaction plant hormones period. Glucose correlated accumulation, peaking ecodormancy parallel increases some ABA/GAs.