scholarly journals Effect of irrigation regime on the production of volatiles that affect the aroma of the pear variety Triumph of Vienna (Pyrus communis L.)

2019 ◽  
Vol 13 (3) ◽  
pp. 348-358 ◽  
Author(s):  
Javier Enrique Vélez ◽  
Wilson Polanía ◽  
Nicolás Beltrán
Keyword(s):  
Growth Period ◽  
Pyrus Communis ◽  
Sensory Profile ◽  
Phenological Stage ◽  
Pear Fruit ◽  
Regulated Deficit Irrigation ◽  
Physiological Processes ◽  
Pyrus Communis L ◽  
Low Sensitivity

Water is a major component of plants that directly and indirectly affects physiological processes. One of the consequences of a hydric deficit in the pear fruit is modification of the aroma. No information exists on the effect of a water deficit on the sensory profile and volatile composition of this species. The objective was to determine the production of volatiles in the harvest and post-harvest of pear var. Triumph of Vienna (Pyrus communis L.) with regulated deficit irrigation (RDI). The irrigation treatments consisted of the application of water regimes that were 100 (Control), 74 and 48% of the ETc during the rapid fruit growth period. The rest of the season plants were irrigated at 100%ETc. In the deficit treatments, there were no significant reductions with respect to the control in the quality of the fruits, obtaining a water savings in 74 and 48%ETc of 26 and 40%, respectively. The esters were the volatile compounds that contribute greatly to aroma, which increased steadily during the climacteric phase. Under the limited water conditions, watering with regulated, deficit doses obtained production that was similar to that of well-watered crops, provided that it was carried out in the phenological stage of low sensitivity and that the tolerance limits of stress were not exceeded.

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.

scholarly journals YIELD AND QUALITY OF WINTER CULTIVARS OF PYRUS COMMUNIS L. UNDER CONDITIONS OF THE CRIMEA

2019 ◽  
pp. 93-101
Author(s):  
A.I. Sotnik ◽  
◽  
R.D. Babina ◽  
P.G. Khoruzhiy ◽  
L.Yu. Grishanova ◽  
...  
Keyword(s):  
Pyrus Communis ◽  
Yield And Quality ◽  
Pyrus Communis L ◽  
The Crimea

scholarly journals Effect of deficit irrigation on yield and quality of pear (Pyrus communis cv. Triumph of Vienna)

2017 ◽  
Vol 35 (3) ◽  
pp. 350-356 ◽  
Author(s):  
Adriana Carolina Moreno-Hernández ◽  
Javier Enrique Vélez-Sánchez ◽  
Diego Sebastiano Intrigliolo
Keyword(s):  
Deficit Irrigation ◽  
Growth Stage ◽  
Pyrus Communis ◽  
Fruit Growth ◽  
Stem Water Potential ◽  
Regulated Deficit Irrigation ◽  
Yield And Quality ◽  
Volume Curve ◽  
Pressure Volume Curve

Crop demands for irrigation require different technologies to optimize the use of water. Regulated Deficit Irrigation (RDI) is a strategy that enables a significant reduction of water application without affecting the crop yield and quality, with the advantage of being a tool for control of vegetative growth. The present study was conducted in Sesquile, Cundinamarca (Colombia) between 2015 and 2016. The objective was to evaluate the quality and development of pear crop (Pyrus communis L. cv. Triumph of Vienna) on field conditions, using three treatments of 100%, and 25% of water requirement (ETc) and no irrigation, applied at the rapid fruit growth stage. The mid day stem water potential, plant water relations, pressure-volume curve, fruit yield and quality were evaluated. There were no significant differences in the yield and quality of the fruits among the different irrigation treatments. The trees had the mechanisms of osmotic adjustment, which allowed water stressed trees to cope with irrigation restrictions during the rapid fruit growth stage without affecting the yield.

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

scholarly journals Effects of Melatonin Treatment of Postharvest Pear Fruit on Aromatic Volatile Biosynthesis

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4233 ◽  
Author(s):  
Jianlong Liu ◽  
Hanting Liu ◽  
Ting Wu ◽  
Rui Zhai ◽  
Chengquan Yang ◽  
...  
Keyword(s):  
Gene Expression ◽  
Consumer Satisfaction ◽  
Storage Period ◽  
Hydroperoxide Lyase ◽  
Pear Fruit ◽  
Expression Of Genes ◽  
Pyrus Communis L ◽  
Genes Encoding ◽  
Alcohol Acyltransferase

Aroma affects the sensory quality of fruit and, consequently, consumer satisfaction. Melatonin (MT) is a plant growth regulator used to delay senescence in postharvest fruit during storage; however, its effect on aroma of pear fruit remains unclear. In this study, we assessed the effects of 0.1 mmol L−1 MT on volatiles and associated gene expression in the fruit of pear cultivars ‘Korla’ (Pyrus brestschneideri Rehd) and ‘Abbé Fetel’ (Pyrus communis L.). MT mainly affected the production of C6 aromatic substances in the two varieties. In ‘Korla’, MT inhibited expression of PbHPL, and reduced hydroperoxide lyase (HPL) activity and content of hexanal and (E)-hex-2-enal. In contrast, MT inhibited activity of lipoxygenase (LOX), reduced expression of PbLOX1 and PbLOX2, promoted PbAAT gene expression, increased alcohol acyltransferase (AAT) activity, and increased propyl acetate, and hexyl acetate content in ‘Abbé Fetel’ that similarly led to the reduction in content of hexanal and (E)-hex-2-enal. Content of esters in ‘Abbé Fetel’ pear increased with increasing postharvest storage period. Although mechanisms differed between the two varieties, effects on aroma volatiles mediated by MT were driven by expression of genes encoding LOX, HPL, and AAT enzymes.

Selenium uptake and fruit quality of pear (Pyrus communis L.) treated with foliar Se application

2019 ◽  
Vol 182 (4) ◽  
pp. 637-646 ◽  
Author(s):  
Xiao-Fang Deng ◽  
Zhu-Qing Zhao ◽  
Zeng-Yu Han ◽  
Li-Qiang Huang ◽  
Chen-Hao Lv ◽  
...  
Keyword(s):  
Fruit Quality ◽  
Pyrus Communis ◽  
Selenium Uptake ◽  
Pyrus Communis L
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