HORT 3430 Study Guide - Quiz Guide: Pollen Tube, Petunidin, Peonidin

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Grapes bloom and set fruit in the very longest days of the summer but don"t ripen until well past the september equinox. It is critical that all conditions are as perfect as possible during bloom when maturity is still 3 months away. This is because stress imposed on the vine and florets can lead to an unsuccessful vineyard. The stresses can be caused by environmental, physiological or invasion of pests. This can then reduce the overall leaf activity such as photosynthesis; phloem activity where transportation of carbohydrates happens and; xylem activity where root growth and expansion, also replacement of water and reserves occurs. Ultimately the less overall stresses the better for production of grapes. So, practices need to be used in order to reduce the stresses. Also, as the berry develops it reaches the vital stage 3 . During stage 3 the final swell occurs due to rapid cell expansion and the active intake of sugars against concentration gradient.

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