Articles
TEMPERATURE EFFECT ON DORMANCY RELEASE IN APRICOT WHEN APPLIED IN DIFFERENT DORMANT STAGES
Article number
966_24
Pages
155 – 161
Language
English
Abstract
The effect of different chilling temperatures on vegetative and reproductive bud dormancy progression in excised shoots of apricot was evaluated during two seasons.
Temperature treatments were applied at different dormant stages, when the chill accumulated in the field ranged from 0 to 49 chill portions (CP), corresponding to 0 to 100% of the chilling requirement (CR) of the apricot selection Z505-2. Forcing conditions were applied after a 60-day chill treatment on each sampling date.
Budbreak rate (1 / mean time to bud break MTB-1-) was established to determine dormancy depth.
Maximum depth of dormancy was achieved by mid-October, when no chill had accumulated in field conditions.
Reproductive buds showed a shallower endodormancy and an earlier dormancy release than vegetative buds.
High temperatures induced reproductive bud-drop in all the sampling dates except in December.
Similar dormancy progression pattern was obtained in both lateral and terminal vegetative buds.
The results showed that the stage of dormancy has a strong influence on the effect of the different temperatures.
Thus, the introduction of this differential effect could help to improve the models to estimate dormancy release.
Temperature treatments were applied at different dormant stages, when the chill accumulated in the field ranged from 0 to 49 chill portions (CP), corresponding to 0 to 100% of the chilling requirement (CR) of the apricot selection Z505-2. Forcing conditions were applied after a 60-day chill treatment on each sampling date.
Budbreak rate (1 / mean time to bud break MTB-1-) was established to determine dormancy depth.
Maximum depth of dormancy was achieved by mid-October, when no chill had accumulated in field conditions.
Reproductive buds showed a shallower endodormancy and an earlier dormancy release than vegetative buds.
High temperatures induced reproductive bud-drop in all the sampling dates except in December.
Similar dormancy progression pattern was obtained in both lateral and terminal vegetative buds.
The results showed that the stage of dormancy has a strong influence on the effect of the different temperatures.
Thus, the introduction of this differential effect could help to improve the models to estimate dormancy release.
Authors
J.A. Campoy, D. Ruiz, J. Egea
Keywords
budbreak, chilling efficiency, dormancy, model, Prunus armeniaca L., temperature
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