Effects of thermotherapy and virus status on yield, annual growth and grape composition of Sultana
DOI:
https://doi.org/10.5073/vitis.1984.23.268-273Abstract
A high yielding Sultana clone, H5, infected with yellow speckle and leafroll diseases was compared over 5 harvests with 6 heat-treated H5 clones, 3 of which still contained both diseases and 3 from which leafroll had been eliminated, and also with a Thompson Seedless clone (FV B6Vl HT91) from California.
There were no differences between .the untreated H5 clone and the Thompson Seedless clone which was infected with only yeilow speckle for any of the measured variables in any season.
The mean yield of heat-treated H5 clones was reduced by 6 % in those which still contained both diseases and was not affected in those from which leafroll had been eliminated. The yield reduction was related to fewer inflorescences.
The mean weight of annual shoot growth, berry weight, calculated bunch. weight, sugar concentration and pH and titratable acidity of juice, did not differ between the 4 groups.
Long periods of heat treatment (196-938 d) produced no clones with yields or annual shoot growth superior to the untreated source clone.
Except for expression of leaf symptoms associated with leafroll, all 6 heat-treated H5 clones showed no obvious morphological differences from their original source clone, nor did the heat-treated Thompson Seedless clone.
Der Einßuß von Thermotherapie und Virusbefall auf Traubenertrag, Holzproduktion und Traubenqualität der Rebsorte Sultana
Zusammenfassung. - Der an Yellow speckle und Leafroll erkrankte ertragsstarke Sultana-Klon H5 wurde 5 Ernteperioden lang mit 6 wärmebehandelten H5-Klonen - 3 davon noch mit beiden Krankheiten, 3 nur noch mit Yellow speckle behaftet - sowie mit einem Thompson-Seedless-Klon (FV B6Vl HT91) aus Kalifornien verglichen.
Zwischen dem unbehandelten H5-Klon und dem Thompson-Seedless-Klon, der nur an Yellow speckle erkrankt war, wurden in keinem Jahr irgendwelche Unterschiede der erfaßten Meßgrößen festgestellt.
Der mittlere Traubenertrag der wärmebehandelten H5-Klone war bei den doppelt erkrankten Reben um 6 % verringert und bei den Leafroll-freien Reben nicht beeinflußt. Der Ertragsrückgang war mit einer geringeren Anzahl von Infloreszenzen verbunden.
Die 4 Versuchsgruppen zeigten keine Unterschiede bei jährlichem Holzzuwachs, Beerengewicht und kalkuliertem Traubengewicht sowie Zuckerkonzentration, pH und titrierbarer Säure des Beerensaftes.
Lange Perioden der Wärmebehandlung (196-338 d) ergaben keine Klone, die in ihrem Traubenertrag oder der Holzproduktion dem unbehandelten Ausgangsklon überlegen gewesen wären.
Abgesehen von den Leafroll-Symptomen der Blätter zeigten alle 6 wärmebehandelten H5-Klone keine erkennbaren morphologischen Abweichungen von ihrem Ausgangsklon; Entsprechendes gilt für den wärmebehandelten Thompson-Seedless-Klon.
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