scholarly journals Ascorbic acid content in potato tubers with coloured flesh as affected by genotype, environment and storage

2018 ◽  
Vol 64 (No. 12) ◽  
pp. 605-611
Author(s):  
Karel Hamouz ◽  
David Bečka ◽  
Ivana Capouchová
Keyword(s):  
Ascorbic Acid ◽  
Ascorbic Acid Content ◽  
The Other ◽  
Potato Tubers ◽  
Flesh Colour ◽  
Fresh Matter ◽  
Tuber Flesh ◽  
Yellow Flesh ◽  
And Storage ◽  
Genotype A

The aim of the study was to evaluate the effect of genotype, tuber flesh colour, site conditions, year of cultivation and storage on the content of ascorbic acid (AAC) in the tubers of twelve potato cultivars with coloured flesh, compared with the yellow-flesh cv. Agria. AAC ranged from 88.6 to 282.0 mg/kg fresh matter (FM) and it was significantly influenced by genotype. A significantly highest AAC, on a three-year average, was achieved by cv. Rosemarie with red flesh (218.9 mg/kg FM; 1.10–1.84-fold more than the other cultivars). Position number two was achieved by the control cv. Agria (199.4 mg/kg FM). The purple or red colour of the cultivars with coloured flesh did not have a significant effect on the AAC. A significantly higher (1.17 times) AAC was determined at the Uhříněves site with warmer climate and drier weather before the harvest, compared with the other site in Valečov. The AAC was also significantly affected by year of cultivation. Cold storage (4°C, 180 days) resulted in a significant decrease in AAC, which varied in dependence on the genotype of the cultivars (34.6% to 65.1%). However, no link to the colour of the tuber flesh was found.

scholarly journals Effect of growing conditions and storage on the total anthocyanin content in potatoes with coloured flesh

2018 ◽  
Vol 64 (No. 9) ◽  
pp. 435-440
Author(s):  
Hamouz Karel ◽  
Lachman Jaromír ◽  
Bečka David ◽  
Pulkrábek Josef
Keyword(s):  
Cold Storage ◽  
The Other ◽  
Anthocyanin Content ◽  
Flesh Colour ◽  
Fresh Matter ◽  
Total Anthocyanin ◽  
Total Anthocyanin Content ◽  
Growing Conditions ◽  
And Storage

The aim of the study was to evaluate the effect of cultivar, flesh colour, location, year and long-term cold storage on the total anthocyanin content (TAC) in the tubers of 12 potato cultivars with coloured flesh. TAC ranged from 17.0 to 750.1 mg cyanidin/kg fresh matter and was significantly affected by the genotype of the cultivar. The highest TAC was achieved in a three-year average in the cv. Vitelotte (371.0 mg/kg FM, 1.15–8.10 times higher than in the other cultivars). The purple or red colour of the flesh had no significant effect on the TAC. A significantly higher TAC (1.24 times) was determined in the Valečov location with a cooler climate in comparison with the Uhříněves location with a warmer climate. The TAC was significantly influenced by year, the highest values were found at both sites in the year with significant water stress. Storage (4°C, 6 months) significantly affected the TAC in seven out of eight cultivars; the TAC increased in four cultivars and decreased in three cultivars. This is probably due to different disposition of cultivars for the accumulation of sugars during cold storage.  

scholarly journals Effect of selected factors on the content of ascorbic acid in potatoes with different tuber flesh colour

2009 ◽  
Vol 55 (No. 7) ◽  
pp. 281-287 ◽  
Author(s):  
K. Hamouz ◽  
J. Lachman ◽  
P. Dvořák ◽  
M. Orsák ◽  
K. Hejtmánková ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Ascorbic Acid Content ◽  
Vegetation Period ◽  
Field Trials ◽  
N Fertilization ◽  
Mineral Fertilization ◽  
Flesh Colour ◽  
Group Of Seven ◽  
Tuber Flesh ◽  
Negative Effect

In precise field trials in the years 2004–2008 in the Czech Republic the effect of conditions of location, variety and mineral fertilization on ascorbic acid content (AA) in potatoes with different tuber flesh color was investigated. Significant was the effect of variety. The Marabel variety with the highest AA content (248 mg/kg FW) exceeded other eight varieties by 13.4–74.1%. The Valfi variety, in five-year trials the only variety with purple colored flesh, ranked among analyzed varieties moderately below average. In addition, in the year 2008 the group of seven varieties with purple and red tubers was evaluated and AA content lower by 15.2% compared to the group of varieties with yellow flesh was determined. Also, significant differences were determined between the varieties with coloured tubers; the highest AA content was found in the red-fleshed variety Highland Burgundy Red (234 mg/kg FW). A negative effect on AA content in tubers was observed at increased intensity of N fertilization (at 180 kg N/ha, AA decreased by 12.4% compared to 100 kg N/ha). Enhanced levels of potassium and magnesium fertilization had no effect on the AA content. The effect of location on AA content was not shown; however, from the four locations in average of five years a pronounced trend of the highest content of ascorbic acid on the location Přerov nad Labem with the highest temperature averages during vegetation period of experimental years was determined (by 0.9°C, 2.3°C, and 5.9°C higher compared with other locations).

Über die quantitative Verteilung der Ascorbinsäure innerhalb der Pflanzenzelle

1964 ◽  
Vol 19 (12) ◽  
pp. 1146-1149 ◽  
Author(s):  
Wolfgang Franke ◽  
Ulrich Heber
Keyword(s):  
Ascorbic Acid ◽  
Acid Content ◽  
Cell Walls ◽  
Direct Evidence ◽  
Ascorbic Acid Content ◽  
The Other ◽  
Leaf Cell ◽  
Unequal Distribution ◽  
Freeze Dried ◽  
High Figure

Leaves, which had been killed in liquid air, were freeze dried and then fractionated by a nonaqueous method. Two fractions were obtained, one consisting of chloroplasts and the other of cytoplasm, vacuolar constituents, cell walls and residual chloroplasts. Calculation of the intracellular distribution of ascorbic acid based on the analysis of the two fractions revealed that 40 to 50% of the total ascorbic acid content of the cells is located within the chloroplasts. Since chloroplasts occupy less than 10% of the total volume of the cells, this high figure is direct evidence of an unequal distribution of ascorbic acid within the leaf cell.

scholarly journals Chlorogenic acid content in potato tubers with colored flesh as affected by a genotype, location and long-term storage

2019 ◽  
Vol 65 (No. 7) ◽  
pp. 355-360
Author(s):  
Matyáš Orsák ◽  
Karel Hamouz ◽  
Jaromír Lachman ◽  
Pavel Kasal
Keyword(s):  
Chlorogenic Acid ◽  
Acid Content ◽  
Field Experiments ◽  
The Other ◽  
Potato Tubers ◽  
Flesh Color ◽  
Long Term Storage ◽  
And Storage ◽  
Term Storage

In three-year field experiments, the effect of genotype, flesh color, site conditions and storage on chlorogenic acid content (CAC) in tubers of potato cultivars with purple or red flesh was compared to yellow-fleshed cv. Agria. The results confirmed the significant effect of genotype on CAC. The highest CAC was characteristic on a three-year mean for the purple-fleshed cv. Vitelotte (769.5 mg/kg fresh weight (FW)), i.e. 1.19−2.6 times higher than in the other cultivars. In regard to the effect of flesh color, significantly higher mean CAC levels have been shown for the red-fleshed (2.8 times) and purple-fleshed (3.16 times) cultivars in comparison with cv. Agria (148 mg/kg FW). At the Uhříněves location with a warmer climate and frequent dry periods as compared to the second Valečov location, a higher CAC (1.18 times) was found. Cold storage (4°C, 6 months) resulted in a significant CAC increase varying from 33.2% in the Blaue St. Galler cultivar to 210.6% in the Vitelotte cultivar among all eight evaluated color-fleshed cultivars. On the other hand, the effect of storage on CAC was not evident in the yellow-fleshed Agria cultivar (inconclusive difference against CAC after harvest).

scholarly journals The yield and quality of broccoli grown under flat covers with soil mulching

2014 ◽  
Vol 60 (No. 5) ◽  
pp. 228-233 ◽  
Author(s):  
E. Kosterna
Keyword(s):  
Ascorbic Acid ◽  
Dry Matter ◽  
Nutritive Value ◽  
Ascorbic Acid Content ◽  
Chemical Components ◽  
Marketable Yield ◽  
Fresh Matter ◽  
Organic Mulch ◽  
Yield And Quality ◽  
Rye Straw

The experiment was carried out between 2010 and 2012. Effect of plants covering and the kind of organic mulch applied to soil mulching on the yield and selected component of nutritive value in Milady F<sub>1</sub> broccoli cultivated for early harvest was investigated. The application of polypropylene fibre contributed to a significant increase in the marketable yield of broccoli on average by 5.25 t/ha, weight of head by 0.10 kg and length of arc by 1.44 cm. Increase of the content of chemical components as a result of plants covering amounted to 1.76% for dry matter,&nbsp;2.50 mg/100 g fresh matter (FM) for ascorbic acid, 0.65% FM for total sugar and 0.15% FM for monosaccharides. All kinds of straw contributed to an increase in the broccoli yield and improvement its parameters. The highest marketable yield and weight of head was obtained in the plots mulched with buckwheat straw. Irrespective of covering, cultivation on the mulch with buckwheat straw contributed to a slight decrease in dry matter, total sugars content, whereas cultivation on the rye straw decreased ascorbic acid content.

scholarly journals THE EFFECTS OF APPLYING PARAQUAT, ATRAZINE AND SIMAZINE FOR WEED CONTROL IN RASPBERRIES IN COASTAL BRITISH COLUMBIA

1967 ◽  
Vol 47 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Jack A. Freeman
Keyword(s):  
Ascorbic Acid ◽  
Weed Control ◽  
Ascorbic Acid Content ◽  
Early Spring ◽  
The Other ◽  
Leaf Injury ◽  
Excellent Control ◽  
Winter Annuals ◽  
Pre Treatment ◽  
Coastal British Columbia

Early spring and fall applications of a mixture of paraquat 2.2 kg and simazine 2.2 to 3.4 kg/ha repeated over a 3-year period provided excellent weed control without adversely affecting raspberry yield. Paraquat 2.2 kg/ha applied in April gave good broadleaf weed control for 2 months and fairly good grass control for 3 months. Fall applications suppressed grasses and controlled winter annuals through to spring. Combining paraquat with simazine eliminated the need for pre-treatment hoeing or cultivation and prolonged weed control. Atrazine 3.4 and 5.6 kg/ha applied in the spring resulted in excellent control of grass and broadleaf weeds. But, fall applications were not as effective for weed control as the paraquat and hoe-plus-simazine treatments. Atrazine 5.6 kg/ha caused chlorosis and necrosis of the raspberry leaves and reduced yields. Simazine, on the other hand, caused little or no leaf injury, but it also reduced yields at the 5.6-kg rate. Fruit quality was not affected significantly by any treatment, although atrazine and simazine tended to increase ascorbic acid content.

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