Since ancient times, table grapes (Vitis vinifera L.) have been one of the most important fruit crops from the standpoint both of the producer (regional economics) and the consumer (healthy eating). In recent decades, much effort has been devoted to the development of this crop in order to improve fruit quality and yield; however, these advances have also entailed considerable increases in the use of agrochemicals. Unfortunately, as is now coming to light, the increased agrochemical use has had deleterious effects on the environment and has also had significant negative effects on human health and wellbeing. Our research investigates the effects of pre-harvest fruit bagging on key fruit quality traits and also on the accumulation of agrochemical residues in the fruit. Two prevalent white table grape cultivars were used, ‘Italia’ (late ripening) and ‘Vittoria’ (early ripening). They were bagged with three different materials: (1) paper, (2) parchment (a cellulose-based material), and (3) a non-woven fabric (felted polypropylene fibers). The bags were placed on grape clusters at phenological state BBCH 75 until harvest, and the bagged clusters were then compared with the unbagged control clusters. Qualitative traits and agrochemical residuals were assessed at harvest for two consecutive years, 2021 and 2022). The results show that the parchment protection bags positively affected some key fruit quality traits, with bigger and better-colored berries than the unbagged controls. Compared with the unbagged controls, all bagging treatments greatly reduced the levels of agrochemical residues, analyzed using GC-MS/MS and HPLC-MS/MS. For cv. ‘Italia’, in 2021 residues fell from 0.733 mg/kg (unbagged control) to 0.006 mg/kg (bagged), and in 2022 from 0.201 mg/kg (unbagged control) to 0.008 mg/kg (bagged); for cv. ‘Vittoria’, in 2021 residues fell from 0.201 mg/kg (unbagged control) to 0.008 mg/kg (bagged), and in 2022 from 0.077 mg/kg (unbagged control) to 0.046 mg/kg (bagged). The study shows the benefits of pre-harvest fruit bagging on grape berry quality and underscores the pivotal role bags can play in minimizing agrochemical residue accumulations on the fruit. The study marks the taking of a crucial step towards more sustainable and safer practices in the table grape production industry.

Almond (Prunus dulcis (Mill.) D.A. Webb) is one of the most economically important nut crops worldwide, valued for its nutritional properties and adaptability to diverse agroecological environments. This review summarizes current knowledge on almond domestication, genetic diversity, production trends, and improvement strategies, with a focus on drought tolerance under climate change. Archaeobotanical and molecular evidence indicate central Asia and the eastern Mediterranean as key centers of origin, where recurrent introgression from wild Prunus species contributed to the high genetic variability of cultivated almond. Global production trends reveal increasing challenges due to prolonged drought, climate variability, and rising water and energy costs, particularly affecting major producers such as the United States. Mediterranean regions are transitioning from traditional low-density orchards to intensive systems, where cultivar and rootstock choice are crucial for sustainability. Self-fertile and late-blooming cultivars improve yield stability, while interspecific hybrid rootstocks enhance water use efficiency and tolerance to drought and poor soils. Drought stress impacts almond physiology and yield, although moderate deficit irrigation can maintain productivity and improve kernel quality. Future improvement relies on germplasm conservation, marker-assisted selection, and genomic tools to develop climate-resilient cultivars integrated with sustainable water management strategies.

Despite the economic and ecological importance of the carob tree, few studies are available on the morphological characterization and chemical composition of carob in Algeria. This has resulted in the lack of selection of commercial cultivars of high seed and sugar content. The present study aims to assess the diversity of 11 wild and 1 cultivated carob populations in various regions of Algeria, characterized by diverse geographical and climatic conditions. The final objective is to assess the diversity of neglected carob plants that exhibit superior fruit quality traits and/or are well adapted to different pedoclimatic conditions. The current study focuses on analyzing pod and seed diversity by investigating 12 morphological and 5 physiochemical traits. The analysis of variance revealed significant differences between populations (p < 0.001) for all traits studied, indicating high morphological and chemical variability among these carob populations. Principal component analysis (PCA) was employed to study the relationship between these traits and the geographical origin. High seed yields characterized wild populations, whereas cultivated populations were rich in sugar. Based on morphological traits of pods, seeds and chemical compositions, a hierarchical clustering grouped the carob populations into four groups. The findings of this study represent a significant advancement towards establishing effective cultivar breeding programs in Algeria. They demonstrate that the germplasm examined in this research exhibits an optimal level of morphological and chemical diversity, which is instrumental in the identification of specific traits of both commercial and environmental significance.

Carob (Ceratonia siliqua L. Fabaceae) is a species of significant economic, ecological, and cultural importance in the Mediterranean region. It is valued for its adaptability to various environments and wide-ranging agricultural and industrial applications. Despite its potential, the genetic characterization of this species in Algerian territories has received little attention to date. The present study aims to decipher carob’s genetic structure and diversity in Algeria. This study presents a comprehensive morphological characterization of 39 Algerian carob accessions based on pod traits and molecular genotyping using eight nuclear and three chloroplast SSR markers across different geographical locations and environmental conditions. The morphological analysis revealed a discrete differentiation among accessions, primarily influenced by their area of origin. The genetic analysis identified 38 unique genotypes. Allelic richness indicated high polymorphism, with an average of 3.81 alleles and 5.36 genotypes for nuclear SSR markers. Chloroplast SSR markers showed lower variability but provided insights into population structure. Genetic analysis revealed distinct genetic clusters aligned with geographical and bioclimatic regions, supported by minimum spanning network analysis that showed the genetic flow patterns among accessions. Discriminant analysis of principal components identified five optimal sub-population groups, highlighting a genetic structure linked with different bioclimatic conditions. These findings evidence the complex genetic diversity of Algerian carob germplasm and offer valuable insights for the sustainable exploitation of carob genetic resources.

Almond skins represent an underexploited by-product of the almond processing chain, despite being a rich source of bioactive compounds with potential applications as a functional food ingredient. However, the Traditional Blanching Peeling (TBP) process, which involves the use of hot water, causes the leaching and degradation of bioactive compounds, reducing the functional value of the recovered skins. In this study, liquid nitrogen peeling (LNP) was investigated as an alternative approach to enhance the recovery of bioactive-rich almond skins. To assess the variability of bioactive compounds in different cultivars, a total of 106 almond genotypes from a germplasm collection were screened for skin yield, total polyphenol content, and antioxidant activity. Principal component analysis (PCA) was applied to select a representative subset of cultivars capturing the variability of the germplasm in terms of bioactive composition and technological traits. The skins obtained using LNP exhibited higher polyphenol content and antioxidant activity compared to those obtained using conventional peeling. Despite variability among samples, in some cultivars such as ‘Universo’, TPC increased from 570.58 mg GAE/100 g after TBP to 1588.05 mg GAE/100 g after LNP, corresponding to an increase of approximately 178% (p < 0.05). Moreover, in all selected cultivars, kernel color (CIELab*) was not significantly affected by LNP, confirming the preservation of kernel quality. These results highlight the importance of cultivar selection and support LNP as a promising approach for the valorization of almond skins as functional by-products.

The slopes of Mount Etna (Sicily, Italy) are home to an extraordinary viticultural heritage, comprising several vine genotypes at risk of extinction, whose oenological potential remains largely unexplored. This study aims to provide an aromatic characterization of red wines produced from five old-vine genotypes (Barbarossa Etna, Madama Nera, Moscatella Nera, Minnella Nera, and Terribile), comparing them with local and international cultivars. The wines were produced using standardized microvinification techniques; physicochemical parameters were measured according to OIV methods, volatile aromatic compounds were analyzed using HS-SPME/GC-MS, and sensory analysis was carried out using quantitative descriptive analysis. The wines from old-vine genotypes exhibited physicochemical characteristics in line with Etna DOC standards. The profiling of volatile organic compounds revealed clear cultivar-specific aromatic characteristics, with Moscatella Nera exhibiting the most complex and terpene-rich content. The sensory analysis confirmed a distinctive aroma for each old-vine genotype wine, with substantial differences from traditional and international wines. These results support the oenological significance of these old-vine genotypes and their potential reintroduction into production to enhance the biodiversity and identity of Etna wines.