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Extending postharvest quality attributes of grapes (V. vinifera L. cv. ‘Thompson Seedless’) by preharvest calcium pulverizations

100%

Sabir F. K., Sabir A.

Acta Scientiarum Polonorum. Hortorum Cultus

2017

tom 16

nr 5

Demand for fresh grape is increasing globally in accordance with the improvement in living standard since the grape berry contains large amounts of phytochemicals including anthocyanins, phenolics, flavonoids and resveratrol, which have been suggested to be responsible for human health benefits. However, table grapes easily undergo deterioration due to their soft texture and the high water content, which make it difficult to preserve without treatment. This study was thus conducted to evaluate the effect of preharvest calcium sprays on maintenance of postharvest quality of grapes (V. vinifera L. cv. ‘Thompson Seedless’). Three preharvest calcium sprays were applied to leaves and developing green berries with or without leaf removal pruning (a traditional practice performed in commercial vineyards worldwide) during berry development stages. After harvest, grapes were cold stored (1°C, 90% R.H.) up to 3 months. Preharvest micronized calcium sprays, with or without leaf removal pruning, markedly extended the postharvest quality of grapes by delaying weight loss, reducing decay, maintaining rachis chlorophyll concentrations and preserving visual quality during the prolonged cold storage. Besides, in calcite-treated grapes, lower titratable acidity decrease courses with a subsequent lower maturity index during prolonged storage indicate that calcite sprays restricted postharvest physiological senescence of grapes. Overall findings indicated that preharvest calcite sprays may be an environmental-friendly, healthy and sustainable viticulture practice for extending postharvest quality of grapes.

Vine growth and yield response of Alphonse Lavallee (V. vinifera L.) grapevines to plant growth promoting rhizobacteria under alkaline condition in soilless culture

61%

Sabir A., Karaca U., Yazar K., Sabir F. K., Atilla Yazici M., Dogan O., Kara Z.

Acta Scientiarum Polonorum. Hortorum Cultus

2017

tom 16

nr 4

High carbonate content in soil negatively affect plant growth, because the availability of nutrients is restricted due to high pH. The present investigations were carried out to reveal possible alleviating effects of the exogenous root inoculation PGPRs on development and physiology of soilless-grown grapevines cultivated under alkaline stress in controlled glass house. pH of growth medium was increased from 7.5 to the values ranging from 7.9 (control) to 8.1 (A18) according to the bacterial inoculations by NaHCO3 supplementations. Bacteria inoculations did not result in statistically significant differences in pH values of growth media. The bacterial population density found in the rhizosphere of grapevines ranged from 6 × 108 CFU mL−1 (M-3) to 9 × 108 CFU mL−1 (Ca-637). The highest value of shoot thickness was obtained from Ca-637 (5.3 mm), followed by A18 (5.2 mm), while M3 did not significantly affected the shoot thickness. The greatest pruning residue per vine was obtained from A18 treatment (81.5 g), followed by Ca-637 (80.8 g) while the lowest value was determined in control. Vine yield was the greatest with A18 (1128 g) treatment and was followed by Ca 637 (1059 g). Considering the general observations, root inoculation of PGPRs A18 and Ca-637 may be recommended in enhancing bioremediation of alkali growth media.

Ograniczanie wyników

2 Acta Scientiarum Polonorum. Hortorum Cultus

2 Sabir A.

2 Sabir F. K.

1 Atilla Yazici M.

1 Dogan O.

1 Kara Z.

1 Karaca U.

1 Yazar K.

2 2017

Wyniki wyszukiwania

Extending postharvest quality attributes of grapes (V. vinifera L. cv. ‘Thompson Seedless’) by preharvest calcium pulverizations

Vine growth and yield response of Alphonse Lavallee (V. vinifera L.) grapevines to plant growth promoting rhizobacteria under alkaline condition in soilless culture