Grapevine Berries Research Papers - Academia.edu (original) (raw)
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lnvvestigations were carried out to assess the uptake of potassium by the berries of different grape cultivars during the growing season. The results indicate that potassium uptake was constantly inereased from fruit set to the beginning... more
lnvvestigations were carried out to assess the uptake of potassium by the berries of different grape cultivars during the growing season. The results indicate that potassium uptake was constantly inereased from fruit set to the beginning of ripenlng in the cultivars Riesling KI. 239Gm and Ehrenfelser (Riesling x Silvaner) Kl.Gm, whereas in the case of Silvaner Kl. Gm. Müller-Thurgau (Riesling x Silvaner) Kl. Gm and Reichensteiner (Müller-Thurgau x (Madeleine angevine x Calabreser=Fröhlich) Kl. Gm the uptake pattern was different exhibting a significant lag phase in the beginning and gradual increase to a peak at veraison and declining rapidly showing least content of potassium in the berries at harvest.
Seasonal uptake of calcium into the berries was estimated to asses the mechanism of calcium absorption by the developing berries till ripening. The results positively demonstrate the uptake pattern was nearly independant of variety.... more
Seasonal uptake of calcium into the berries was estimated to asses the mechanism of calcium absorption by the developing berries till ripening. The results positively demonstrate the uptake pattern was nearly independant of variety. Mueller-Thurgau and Reichensteiner recorded higher Ca uptake in the beginning of berry development and subsequently reduced the quantities of absorption. In case of Riesling, Ehrenfelser and Silvaner the calcium absorption pattern was different, showing better uptake in the initial stage of growth foJlowed by drastic reduction in uptake. However, at harvest activity of Ca uptake into the berries reassumed after a lag phase between veraison aod harvesting
The total chlorophyll, chlorophyll a and chlorophyll b content and chlorophyll a:b ratio of the grape inflorescence of cv. Müller-Thurgau, Riesling and cv. Dunkelfelder were examined during fruit ontogeny. Chlorophyll content of the... more
The total chlorophyll, chlorophyll a and chlorophyll b content and chlorophyll a:b ratio of the grape inflorescence of cv. Müller-Thurgau, Riesling and cv. Dunkelfelder were examined during fruit ontogeny.
Chlorophyll content of the developing berry sharply decreased from ca. 1.75 after anthesis to ca. 0.2 mg 60 days after anthesis and then plateaued at 0.1-0.2 mg chlorophyll per g dry matter, while the chlorophyll a or b content of the berry declined respectively from 0.12 to 0.005 or 0.045 to 0.005 mg chlorophyll per g dry matter.
The chlorophyll a:b ratios of the berries varied between 1.9 to 2.8:1 compared with 2.5-4:1 in leaves.
The chlorophyll a or b content in the pedicels/peduncle decreased respectively from 0.06 to 0.015 or from 0.03 to 0.005 mg per g dry matter.
The low chlorophyll content and close chlorophyll a: b ratio in the grape berry is discussed with respect to energy transfer in the photosystems and their contribution to fruit photosynthesis.