GROWTH RELATIONSHIPS BETWEEN TRUNK AND GRAPE BERRY USING LINEAR VARIABLE DIFFERENTIAL SENSORS IN Vitis vinifera

摘要

Water transport in grape trunk and berries has been studied with several methods. However, there are no studies that simultaneously evaluate water transport in both organs. This study was conducted in the Aconcagua Valley (Chile) with the cultivar Crimson Seedless using electronic dendrometers. It was observed that trunk growth ceased at the beginning of berry coloring. At the beginning of berry growth stage II resistance to water flow increased; this was attributed to a change in the phloematic discharge in the berry from a symplastic to an apoplastic via. Thus, there are growth interactions among organs, contributing to the hypothesis of physiological interactions between the xylem and phloem during berry development. Also, there would be no xylem dysfunction while a flow of water predominates; this flow is governed by an osmotic gradient that maintains the water potential gradient between the berry and plant until harvest.