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Bud Break Research Paper

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Breaking dormancy in grapes

By the end of the growing season and when the photoperiod and temperature decrease grapevines as a deciduous fruit get rid of their leaves and undergo a rest period their life cycle called Endodormancy. Going into and out of the dormancy stage is controlled by physiological and hormonal changes inside the vine which could be affected by different genetic and environmental factors. During endodormancy, the vines acquired their chilling requirement during the cold winter weather during which, the vines must be exposed to low temperature to meet their chilling requirements and get out of the Endodormancy phase. Generally, chilling requirement for most of the grapevine varieties grow in California is relatively low compared to other fruit trees. However, different varieties have …show more content…

Once the chilling hours are met, buds will regrow when suitable temperature is available. Exposure of the vines to insufficient chilling hours during the Endodormancy stage results in low, erratic, delayed, prolonged bud break and cluster in different developmental stages. This found in the subtropical area characterized by wormer winter. In table grapes, getting a uniform bud break allow to grow uniform clusters and assure that all clusters receive the same cultural practices at the same time to obtain high quality grade. Further, bud break timing might correlate with ripening and harvest date, The earlier bud break the earlier crop we will have and more number of growing buds the more number of clusters and crop we will have. However, weeks in earliness of bud break may translate or not to few days of early ripening. Manipulating the timing of the bud break could be result in advancing grape maturity by one or two weeks. Naturally, grapevine become active following the activation of the cell sap in the vascular system due to the relatively wormer

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