Dormancy: Difference between revisions
Created page with "'''Dormancy''' is a physiological resting phase in the annual growth cycle of the grapevine, during which visible growth ceases and metabolic activity is greatly reduced. From a viticultural and wine perspective, dormancy is essential for vine survival, carbohydrate balance and the regulation of subsequent growth stages, directly influencing budbreak, yield potential and long-term vineyard performance.<ref>Robinson (ed.), ''The Oxford Companion to Wine'', Oxford..." |
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Dormancy in grapevines occurs after [[leaf fall]] in autumn and extends through winter until the resumption of growth in spring. It is commonly divided into two overlapping phases: endodormancy and ecodormancy. Endodormancy is internally regulated within the bud and cannot be broken even under favourable conditions, while ecodormancy is imposed by external environmental factors, primarily low temperature.<ref>Mullins, Bouquet & Williams, ''Biology of the Grapevine'', Cambridge University Press, 1992, ISBN 9780521305071.</ref> | Dormancy in grapevines occurs after [[leaf fall]] in autumn and extends through winter until the resumption of growth in spring. It is commonly divided into two overlapping phases: endodormancy and ecodormancy. Endodormancy is internally regulated within the bud and cannot be broken even under favourable conditions, while ecodormancy is imposed by external environmental factors, primarily low temperature.<ref>Mullins, Bouquet & Williams, ''Biology of the Grapevine'', Cambridge University Press, 1992, ISBN 9780521305071.</ref> | ||
The transition from dormancy to active growth requires exposure to sufficient winter chilling, followed by warmer spring temperatures that trigger | The transition from dormancy to active growth requires exposure to sufficient winter chilling, followed by warmer spring temperatures that trigger budbreak. | ||
== Physiological role == | == Physiological role == | ||
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== Viticultural significance == | == Viticultural significance == | ||
Dormancy is the period during which key vineyard operations take place, most notably [[pruning]]. Pruning timing during dormancy influences vine vigour, yield balance and susceptibility to spring frost. In cooler climates, delayed pruning is sometimes used to postpone budbreak and reduce frost risk.<ref>Keller, ''The Science of Grapevines'', Academic Press, 2015, ISBN 9780124199873.</ref> | Dormancy is the period during which key vineyard operations take place, most notably [[pruning]]. [[Pruning]] timing during dormancy influences vine vigour, yield balance and susceptibility to spring frost. In cooler climates, delayed pruning is sometimes used to postpone budbreak and reduce frost risk.<ref>Keller, ''The Science of Grapevines'', Academic Press, 2015, ISBN 9780124199873.</ref> | ||
Dormancy also affects the uniformity of budburst. Inadequate chilling can lead to irregular or delayed budbreak, resulting in uneven shoot development and ripening. | Dormancy also affects the uniformity of budburst. Inadequate chilling can lead to irregular or delayed budbreak, resulting in uneven shoot development and ripening. | ||