Physio-Biochemical Responses of Sweet Cherry Leaf to Natural Cold Conditions.

Trees of the sweet cherry cultivar 'Grace Star' ( L.) were exposed to low temperatures without frost for two consecutive nights under natural conditions 36 d after flowering, to study the effects on the physiological properties and metabolic status of leaves. The response was studied by measuring chlorophyll fluorescence and gas exchange parameters and by analyzing chloroplast pigments (i) immediately after exposure, (ii) 24 h and (iii) 48 h later.

Summer pruning of sweet cherry: a way to control sugar content in different organs.

Background: Sweet cherry trees (Prunus avium L.) of the cultivar Grace Star were pruned either in dormancy or in summer. The response was studied by analyzing the sugar content in different organs (flower bud, leaf, and fruit) at three sections of the canopy (inner, outer, and upper) using high-performance liquid chromatography.

The Effect of Water Supply on Sweet Cherry Phytochemicals in Bud, Leaf and Fruit.

The influence of a water supply on the content of phytochemicals (sugars, organic acids, hydroxycinnamic acids, flavonols, flavanols and anthocyanins) in the bud, leaf and fruit of sweet cherry ( L.) was studied in two growing seasons. In addition, the shoot length, yield efficiency and fruit weight were determined.

Response of chloroplast pigments, sugars and phenolics of sweet cherry leaves to chilling.

The aim of the present study was to evaluate the effect of post-flowering chilling of sweet cherry (Prunus avium L.) on the content of biochemical parameters in the leaf (chloroplast pigments, sugars and phenolics). The effect of chilling was investigated in two experiments.

Sugars and organic acids in plum fruit affected by Plum pox virus.

Background: Plum pox virus (PPV) causes severe economic losses in stone fruit production, but little is known about its effect on plum fruit composition. In this study, the influence of PPV on sugars and organic acids was evaluated in a susceptible plum (Prunus domestica L.) cultivar.

Effect of Plum pox virus on chemical composition and fruit quality of plum.

The quality of fruit from PPV (Plum pox virus)-infected plum (Prunus domestica L.) trees was investigated during the last 3 weeks of ripening using healthy tree (T3), tree with short-term infection (T2), and tree with long-term infection (T1). The pomological variables (presence of necrosis on fruit, color of fruit, color of flesh, firmness, soluble solids content, and fruit weight) and composition of nutritive compounds (sugars and organic acids) and bioactive compounds (phenolics: anthocyanins, flavonols, and hydroxycinnamic acids) were evaluated.

Phytochemicals in fruits of two Prunus domestica L. plum cultivars during ripening.

Background: Plums are a rich source of nutritive and bioactive compounds. The objective was to evaluate the impact of fruit tissue (flesh and peel), ripening stage and cultivar on the composition of phytochemicals in plums (Prunus domestica L.) and to analyse the relation between total antioxidant activity (TAA) and the measured variables.

Sweet cherry pomological and biochemical characteristics influenced by rootstock.

Fruits of Lapins sweet cherry (Prunus avium L.) from 12-year-old trees on different rootstocks (F 12/1, Maxma 14, Piku 1, Edabriz, Gisela 5, Gisela 195/20, Weiroot 13, Weiroot 158, and Weiroot 72) were analyzed for pomological (fruit weight, % flesh of fruit weight, soluble solids content, titratable acidity, and firmness) and biochemical parameters (individual sugars, organic acids, and phenolic compounds) considering yield. For the first time, two procyanidins have been identified in sweet cherries using HPLC/MS: procyanidin B2 and procyanidin dimer (gamma(max) = 275 nm; [M - H](-) at m/z 577 and MS(2) fragments at m/z 425, 407, and 289).