Effects of girdling on berry quality and leaf photosynthesis in‘Kyoho’grapevines
Date Issued
2009
Date
2009
Author(s)
Wang, Lee-Lien
Abstract
Poor coloration reduced berry quality and market value of summer crop in ‘Kyoho’ table grapes produced with a double cropping system. Girdling at véraison can promote berry coloration and total soluble solid content but the practice might also reduce carbohydrate reserves and leaf photosynthesis rate (Pn). The effect of girdling on berry quality, and the potential negative effects on winter crop as well as leaf photosynthesis in ‘Kyoho’ grapevines were assessed in this study.he result showed that early fruiting shoot girdling did not improve berry diameter, fresh weight, or dry weight. On the other hand, arm girdling at véraison increased dark-color berry number. Berry size, TSS and tartaric acid concentration were not affected by girdling. In addition, carbohydrate and starch content in fruiting shoot and growth rate of winter crop shoot didn’t affected by girdling practiced at véraison.eaf Pn were reduced by shoot girdling 7 to 33 days after treatment. Pn of both girdled (G) and control (CK) vines declined throughout the experiment period. Differences of T mmol and gs between CK and G were significant 13 to 18 days after treatment. The result indicated that reduction in Pn of girdling grapevine was not associated with stomatal closure but non-stomatal components.
Subjects
grape
girdling
fruit quality
gas exchange
Type
thesis
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