scholarly journals Does foliar nutrition influence the pear fruit quality?

2003 ◽  
Vol 9 (2) ◽  
Author(s):  
M. Hudina ◽  
A. Solar ◽  
F. Stampar
Keyword(s):  
High Performance Liquid Chromatography ◽  
Organic Acids ◽  
Fruit Quality ◽  
High Performance ◽  
Shikimic Acid ◽  
Soluble Solids ◽  
Pear Fruit ◽  
Foliar Nutrition ◽  
Foliar Fertilizer ◽  
Pyrus Communis L

The influence of the foliar nutrition on the pear fruit quality (Pyrus communis L.) cv. 'Williams' was studied in years 1997 and 1998. We determined the contents of individual sugars (glucose, fructose, sucrose and sorbitol) and organic acids (malic, citric, fumaric and shikimic) by HPLC (High Performance Liquid Chromatography). The sizes of the fruits (diameter, length, weight) were measured as well as the amounts of soluble solids and titrable acids. The experiment comprised two treatments: the foliar nutrition and the control. In the treatment of foliar nutrition the trees were sprayed five times (from May 22 to July 7) with a foliar fertilizer, which contained 15% of P205, 20% of K20, 0.1% of Mn, 0.1% of B and 0.1% of Mo. The foliar nutrition influenced higher quantities of sugars (glucose, sorbitol, soluble solids) and organic acids (malic, citric) but had no effect on the contents of shikimic acid, pH juice and titrable acids. At the treatment of foliar nutrition a trend of decrease in the contents of fructose, sucrose, fumaric acid, boron, and zinc was noticed.

Phenolic compounds profile, carbohydrates and external fruit quality of the ‘Concorde’ pear (Pyrus communisL.) after bagging

2012 ◽  
Vol 92 (1) ◽  
pp. 67-75 ◽  
Author(s):  
Metka Hudina ◽  
Franci Stampar ◽  
Primoz Orazem ◽  
Maja Mikulic Petkovsek ◽  
Robert Veberic
Keyword(s):  
Phenolic Compounds ◽  
Fruit Quality ◽  
Pyrus Communis ◽  
Soluble Solids ◽  
Soluble Solids Content ◽  
Pear Fruit ◽  
European Pear ◽  
Pyrus Communis L ◽  
Solids Content

Hudina, M., Stampar, F., Orazem, P., Mikulic Petkovsek, M. and Veberic, R. 2012. Phenolic compounds profile, carbohydrates and external fruit quality of the 'Concorde' pear ( Pyrus communis L.) after bagging. Can. J. Plant Sci. 92: 67–75. The practice of pre-harvest bagging has been extensively used in several fruit crops to improve the commercial value of the fruit. The purpose of this study was to investigate the effect of fruit bagging on internal and external quality of the European pear (Pyrus communis L.) cv. ‘Concorde’. Fruit quality was determined by chemical analyses (individual sugars, organic acids and phenolic compounds) and physical characteristics in 2005 and 2006. Bagging of pear fruit after June drop until harvest significantly reduced fruit length in both observed years. Fruit bagging resulted in increased firmness of the fruit only in 2006. Soluble solids content was significantly lower in bagged fruit in 2006. In 2005, bagging had no influence on firmness and soluble solids content. Bagging improved fruit surface lightness, since L* was higher in the bagged than in the control fruit in both years. Also the a* parameter was higher in bagged fruit. We noted significant influence of bagging on total sugars content. Bagging European pear fruit decreased the content of phenolic compounds in skin (catechin, chlorogenic acid, epicatechin, p-coumaric acid, quercetin 3-O-galactoside, quercetin 3-O-glucoside, quercetin 3-O-rhamnoside). The removal of bags 7 d before harvest significantly increased glucose, shikimic and fumaric acids.

Effect of a postbloom naphthaleneacetic acid thinning spray and hand thinning on quality and quantity of pear fruit (Pyrus communis L.) cv. Harrow Sweet

2009 ◽  
Vol 89 (6) ◽  
pp. 1109-1116 ◽  
Author(s):  
M Hudina ◽  
F Štampar
Keyword(s):  
Organic Acids ◽  
Pyrus Communis ◽  
Soluble Solids ◽  
Naphthaleneacetic Acid ◽  
Pear Fruit ◽  
Cross Sectional ◽  
Control Fruit ◽  
Pyrus Communis L ◽  
Negative Effect ◽  
Fruit Diameter

The effect of naphthaleneacetic acid (NAA) and hand thinning on quality and quantity of pear fruit (Pyrus communis L.) cv. Harrow Sweet was investigated in 2005, 2006 and 2007. The experiment included the following treatments: an unsprayed control, hand thinning to 3 fruit cm-2 of trunk cross-sectional area (TCSA), hand thinning to 6 fruit cm-2 of TCSA, NAA at 8 mg L-1 (2005-2007), NAA at 16 mg L-1 (2006-2007) and NAA at 20 mg L-1 (2007). The same treatments were applied to the same trees in each of the three years. NAA thinning did not reduce yield per tree and had no negative effect on fruit set, yield efficiency, or crop load in any of the years. In 2005 and 2006, NAA and hand thinning significantly increased fruit diameter and weight. In 2007, only NAA at 20 mg L-1 significantly increased fruit diameter and weight relative to the control. Fruit firmness was not influenced by NAA or hand thinning in 2005 or 2007, but in 2006, hand-thinned fruits were significantly less firm than control fruit. Hand thinning to 6 fruit cm-2 of TCSA increased fruit soluble solids content in 2006 and 2007. Neither NAA nor hand thinning influenced total sugars or organic acids in fruit. Key words: Yield, sugars, organic acids, HPLC

Determination of organic acids in grape musts, wines and vinegars by high-performance liquid chromatography

1993 ◽  
Vol 655 (1) ◽  
pp. 111-117 ◽  
Author(s):  
E. García Romero ◽  
G. Sánchez Muñoz ◽  
P.J. Martín Alvarez ◽  
M.D. Cabezudo Ibáñez
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Organic Acids ◽  
High Performance ◽  
Grape Musts

Could black anti-hail net have an extra role as an amelioration agent against heat stress in kiwifruit?

2021 ◽  
pp. 1-17
Author(s):  
Peter A. Roussos ◽  
Athanassios Tsafouros ◽  
Efstathios Ntanos ◽  
Nikoleta-Kleio Denaxa ◽  
Anna Kosta ◽  
...  
Keyword(s):  
High Temperature ◽  
Organic Acids ◽  
Antioxidant Capacity ◽  
Fruit Quality ◽  
Photosynthetic Capacity ◽  
Titratable Acidity ◽  
Soluble Solids ◽  
Hail Net ◽  
Future Production ◽  
Present Trial

BACKGROUND: Kiwifruit plants are extremely sensitive to hail storms. Black anti-hail nets are the most frequently used in kiwifruit culture, to protect both the plant and current as well as future production. OBJECTIVE: The present trial aimed to assess if the black hail net could also serve as an amelioration agent against high temperature and irradiance during the summer months. METHODS: The photosynthetic capacity, the yield, and fruit quality (carbohydrates, organic acids, phenolic compounds, and antioxidant capacity) of “Hayward” kiwifruit cultivar, both at harvest and after three months of storage were evaluated. RESULTS: Photosynthetic capacity under the net was slightly higher compared to control, while leaf temperature was always lower during the summer and autumn. The yield was significantly enhanced under the net, while the fruits exhibited higher titratable acidity, organic acids, and ascorbic acid concentration. After the storage, fruits produced from vines grown under net still had higher organic acid content, as well as total soluble solids but lower antioxidant capacity compared to control. CONCLUSIONS: Net installation above kiwifruit canopy seems to alleviate the effects of high temperature and heat load on kiwifruit vines, under saturating light intensity, inducing higher yields with good fruit quality.

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