Effect of abscisic acid and defoliation on anthocyanin accumulation in Kyoho grapes (<i>Vitis vinifera</i> L. x <i>V. labruscana</i> BAILEY)
DOI:
https://doi.org/10.5073/vitis.1982.21.325-332Abstract
In Kyoho grapes, ABA treatment at 1000 ppm in the beginning of ripening enhanced anthocyanin accumulation in the skin without any effect on the contents of soluble solids and titratable acids in the juice.
By defoliation at veraison, anthocyanin synthesis was completely inhibited, and the soluble solids content in the juice and sugar levels in the skin became much less than those of the control. Furthermore, endogenous ABA levels in the skin and flesh did not increase throughout ripening period.
On such defoliated vines, the berries recovered anthocyanin accumulation by ABA application.
From these results, it will be assumed that ABA which accumulates in the skin is one of the main factors involved in the anthocyanin synthesis.
Der Einfluß von Abscisinsäure und Entblätterung auf die Anthocyanakkumulation in Trauben der Rebsorte Kyoho (Vitis vinifera L. x V. labruscana BAILEY)
Wurden Kyoho-Trauben zu Beginn der Beerenreife mit 1 000 ppm ABS behandelt, so war in den Beerenhäuten verstärkt Anthocyan angereichert, ohne daß Mostgewicht und tritierbare Säure des Beerensaftes irgendwie beeinflußt waren.
Durch Entblätterung der Reben zur Zeit des Weichwerdens der Beeren wurde die Anthocyansynthese vollkommen unterdrückt, und das Mostgewicht des Beerensaftes wie auch die Zuckerkonzentration der Beerenhaut waren gegenüber der Kontrolle bedeutend verringert. Ferner nahm die Konzentration der endogenen ABS in Beerenhaut und -fleisch während der ganzen Reifeperiode nicht zu.
Bei den entblätterten Reben setzte nach der Applikation von ABS die Anthocyanakkumulation in den Beeren wieder ein.
Aus den vorliegenden Ergebnissen wird gefolgert, daß die Anreicherung von ABS in der Beerenhaut einer der Hauptfaktoren ist, die an der Anthocyansynthese beteiligt sind.
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