In recent years, significant portions of the fresh fruits and vegetables produced worldwide have been decaying before reaching the consumer because of insufficient preservation after harvest. In this direction, we carried the study out to investigate the effect of gibberellic acid (GA₃) and 1-methyl cyclopropane (1-MCP) applications on phenolic compounds and organic acid contents of the strawberry fruits (cv. Albion) during shelf-life. Gibberellic acid treatments, which prepared in two different concentrations (50 and 100 ppm), were performed by spraying the leaves before harvest. 1-methyl cyclopropane applied after harvest. The results of the study showed a greater decrease in organic acids (except oxalic and succinic acid) in Gibberellic acid-applied fruits during shelf-life. Citric acid was recorded as the most abundant organic acid in the control group. In phenolic compounds, gallic acid (15.22 mg 100 g⁻¹) and ellagic acid (9.38 mg 100 g⁻¹) were recorded as the highest phenolic compounds on the third day. 1-MCP and GA₃ (50 ppm) + 1-MCP treatment reduced the breakdown of vitamin C during the shelf-life of strawberry fruits compared to the control group. As a result, phenolic compounds, vitamin C, and organic acids decreased during the shelf-life, and 1-MCP applications slowed down the breakdown of these compounds.

In this study, agro-morphological properties, phenolic compounds, and organic acid contents in the fruits of service tree (Sorbus domestica L.) genotypes naturally grown in Türkiye (Bolu) were determined. The fruit weights of genotypes were found to be quite variable, ranging from 5.42 g (14MR05) to 12.54 g (14MR07). The highest L*, a*, and b* fruit external color values were found to be 34.65 (14MR04), 10.48 (14MR09), and 9.10 (14MR08), respectively. The highest chroma and hue values were recorded as 12.87 (14MR09) and 49.07 (14MR04), respectively. 14MR03 and 14MR08 genotypes exhibited the highest amount of soluble solid content and titratable acidity (TA) as 20.58 and 1.55%, respectively. The pH value was found to be in the range of 3.98 (14MR010)-4.32 (14MR04). Chlorogenic acid (14MR10, 48.49 mg/100 g), ferulic acid (14MR10, 36.93 mg/100 g), and rutin (14MR05, 36.95 mg/100 g) were predominant phenolic acids observed in the fruits of service tree genotypes. The predominant organic acid in all fruit samples was malic acid (14MR07, 34.14 g/kg fresh weight basis), and the highest quantity of vitamin C was detected at 95.83 mg/100 g in genotype 14MR02. Principal component analyses (%) were performed to determine the correlation between the morphological-physicochemical (60.6%) and biochemical characteristics of genotypes (phenolic compounds: 54.3%; organic acids and vitamin C: 79.9%). It was determined that measured genotypes were important genetic resources in terms of nutritional value.

In this study, agro-morphological, sensory and biochemical characteristics of 23 plum genotypes belonging to Prunus spinosa L. subsp. dasyphylla (Schur) Domin growing wild in the West Black Sea Region in Turkey were investigated. Agro-morphological, sensory and biochemical properties of genotypes were highly different from each other. Principal component analysis was performed to determine the correlation between these properties and genotypes. The variation in the study was determined to be 63.5% in agro-morphological properties, 53.8% in organic acids and 46% in phenolic compounds. In terms of fruit weight, 14BLM08 genotype (38.42 g) was determined to be superior to other genotypes. The fruit firmness value, which is important in the storage of fruits, was recorded as the highest in the 14BLM14 genotype (9.07 kg/cm²). Chlorogenic acid was higher than the other phenolic compounds and the highest value was obtained in the 14BLM20 (11.45 mg/kg) genotype. It was recorded that the value of malic acid, which is the major organic acid of the plums, varied between 269.65–1294.64 mg/100 g. Genotypes showed diverse vitamin C content, and the highest value was found in the 14BLM18 genotype as 54.42 mg/100g. Each genotype showed superiority according to the type of traits, and thus breeders may have used these genotypes as the superior ones for specific plum breeding purposes. In addition, these genotypes could be satisfactorily used in domestication.

The importance of biochemical content of fruits in human health and nutrition is understood more and more day by day. In this study, new local varieties were added to apple genetic resources and the correlation between biochemical contents and agro-morphological properties of fruits belonging to them was revealed. It was observed that the total phenolics amount varied between 20.13 (“Bag”) mg GAE kg⁻¹ and 80.59 (“Yeşil”) mg GAE kg⁻¹. The highest total antioxidant capacity was determined as 90.96% in “Yeşil” variety. Potassium (K) content, which is among the macronutrients, was determined as the highest value in “Bağ” variety (7993.31 mg kg⁻¹) and in “Zuza” variety (7983.31 mg kg⁻¹). It was determined that the Fe content (iron) varied between as 14.17 mg kg⁻¹ (“Zuza”) and 5.75 mg kg⁻¹ (“Bağ”) and was higher than other micronutrients. In the light of the results obtained in this study, it was concluded that fruits belonging to new local apple varieties are rich in biochemical contents and these varieties can be used as genetic resources in plant breeding studies.

In the present research, plum fruits were subjected to pre-storage treatments with salicylic acid at concentrations of 0.5, 1.0, and 1.5 mM, followed by storage durations of 15, 30, 45 days. A control group, without any treatment, was stored under the same conditions. Throughout storage, various parameters including weight loss, fruit firmness, decay and respiration rate, soluble solids content (SSC), titratable acidity (TA), pH, phenolic compounds, organic acids, vitamin C levels were evaluated. Findings revealed that untreated fruits exhibited greater increases in weight loss, SSC, pH, decay, and respiration rates, along with a marked decrease in firmness over time compared to the salicylic acid-treated groups. The TA values in salicylic acid-treated fruits demonstrated variation dependent on the storage interval. In this study, 1.0 mM and 1.5 mM salicylic acid applications were more prominent in terms of physical properties. In the 1.0 mM salicylic acid application, lower weight loss (45th day: 3.60%), decay (45th day: 6.44%), and respiration (45th day: 43.12 mg CO2 kg−1 h−1) rates, and higher fruit firmness (45th day: 31.76) were observed compared to control fruits. Among the treated groups, fruits treated with 1.5 mM salicylic acid retained higher levels of phenolic compounds and organic acids. Moreover, all salicylic acid treatments were effective in preserving vitamin C better than the control. The most prevalent organic acid identified in plums was malic acid (45th day: 258.73 mg 100 g−1), with citric (45th day: 31.01 mg 100 g−1) and succinic (45th day: 26.88 mg 100 g−1) acids following in concentration. Chlorogenic acid (45th day: 8.65 mg 100 g−1) was the predominant phenolic compound, with gallic acid (45th day: 3.62 mg 100 g−1) and p-coumaric acid (45th day: 2.85 mg 100 g−1) ranking next. Overall, the 1.5 mM salicylic acid treatment showed the greatest efficacy in maintaining quality attributes during storage. In 1.5 mM salicylic acid application, fruit firmness increased by 20.15% and weight loss and respiration rate decreased by 54.44% and 39.93%, respectively, compared to control group fruits after 45 days of storage.