Bud developmental evolution along the year. A) Environmental change in temperature and day length. B) Pictures depicting grapevine axillary buds along the year, corresponding to May, June and July, dormant buds from September to March, and during bud break in April. Temperatures are shown as monthly minimum average (blue line), monthly maximum average (orange line) and monthly average (yellow line). Day length (grey line) is shown as light hours per day. Assignments of bud stages were based on previous data on cv. Tempranillo [40, 41].