'Seolhyang' strawberry is harvested before it is fully ripened and treated with COsub.2 to extend the shelf-life. However, the volatile changes in the 'Seolhyang' strawberry after short-term COsub.2 ...treatment have not been investigated, although the volatile profile is an important quality attribute. Herein, we investigated the effect of short-term high COsub.2 treatment on the changes in the composition of volatile compounds in 'Seolhyang' strawberries at two ripening stages (i.e., half-red and bright-red) during cold storage using headspace solid-phase microextraction and gas chromatography-mass spectrometry. Furthermore, the effect of COsub.2 treatment on fruit quality with respect to the aroma was investigated. A total of 30 volatile compounds were identified. Storage increased the volatile compound concentrations, and the total concentration of volatiles in the COsub.2-treated strawberries was lower than that of the untreated strawberries during storage. The production of some characteristic strawberry volatiles (e.g., 4-methoxy-2,5-dimethyl-3(2H)-furanone) was inhibited in COsub.2-treated strawberries. However, COsub.2 treatment helped maintain the concentrations of hexanal and 2-hexenal, which are responsible for the fresh odor in strawberries. Interestingly, COsub.2 treatment suppressed the production of off-odor volatiles, acetaldehyde, and hexanoic acid during strawberry storage. Thus, short-term COsub.2 treatment may help maintain the fresh aroma of strawberries during cold storage.
Strawberries are big business in California. They are the sixth-highest-grossing crop in the state, which produces 88 percent of the nation's favorite berry. Yet the industry is often criticized for ...its backbreaking labor conditions and dependence on highly toxic soil fumigants used to control fungal pathogens and other soilborne pests. In Wilted, Julie Guthman tells the story of how the strawberry industry came to rely on soil fumigants, and how that reliance reverberated throughout the rest of the fruit's production system. The particular conditions of plants, soils, chemicals, climate, and laboring bodies that once made strawberry production so lucrative in the Golden State have now changed and become a set of related threats that jeopardize the future of the industry.
CRISPR Gene Editing in Strawberry Lee, Seonghee; Yoo, Cheolmin; Folta, Kevin M. ...
EDIS,
02/2018, Letnik:
2018, Številka:
1
Journal Article
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Because cultivated strawberries are genetically complex, conventional breeding of strawberry can be difficult. Therefore, gene editing can be useful when developing strawberry varieties. This 3-page ...document discusses CRISPR gene editing in strawberry. Written by Seonghee Lee, Cheolmin Yoo, Kevin Folta, and Vance M. Whitaker and published by the UF/IFAS Horticultural Sciences Department, February 2018. http://edis.ifas.ufl.edu/hs1315
The United States is the second largest producer of strawberries after China, and Florida, along with California, accounts for about 98% of the total US production. In recent years, the US strawberry ...industry has become increasingly concerned with competition from Mexico. This 3-page fact sheet written by Zhengfei Guan, Dong Hee Suy, Hayk Khachatryan, and Feng Wu and published by the UF/IFAS Food and Resource Economics Department describes the impact of imported strawberries on the Florida strawberry industry and explains how the industry can adapt to meet the challenge. http://edis.ifas.ufl.edu/fe1022
Strawberries are one of the most widely cultivated fruits in the world, and their popularity continues to grow due to their unique taste, high nutritional value, and numerous health benefits. The ...success of strawberry cultivation depends largely on the quality of the growing media used. In recent years, there has been a growing interest in soilless media as a sustainable alternative to traditional soil-based growing methods. This study aimed to compare the effect of different growing media, both soil and soilless (Hydroponic Production System) media, on the fruit quality and phytochemical contents of two cultivars of strawberry (Yellow Wonder and Camarosa) in a greenhouse. The values of Fruit weight, fruit firmness, and SSC were higher in soilless media than in soil media. In addition, ʻCamarosaʼ was higher than ʻYellow Wonderʼ in these characteristics. The rates of glucose and fructose were higher in soil media than soilless media, and ʻYellow Wonderʼ was higher than ʻCamarosaʼ in the rates of glucose and fructose. The values of total phenolic content and antioxidant capacity were higher in soil media, and also ʻYellow Wonderʼ was found to have more total phenolic content and antioxidant capacity than ʻCamarosaʼ. In terms of mineral contents, ʻYellow Wonderʼ had higher values than ʻCamrosaʼ in both media. When the results of the study were examined in general, Camarosa red strawberry variety was found to be higher than ʻYellow Wonderʼ in pomological characteristics. Pomological values increased in both strawberry cultivar in soilless media. In terms of phytochemical properties, the ʻYellow Wonderʼ had higher values than the ʻCamarosaʼ. Also, Phytochemical contents were higher in the soil media compared to the soilless media.
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Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Wild strawberry (Fragaria vesca L.) seed oil (WSO) recovered by two methods—cold pressing (CP) and extraction with supercritical carbon dioxide (SCOsub.2E)—taking into account the different ...extraction times, was characterized for its composition and quality. The cytotoxicity assessment of WSOs was also carried out using the normal human dermal fibroblast (NHDF) cell line. Tocopherol and total polyphenol contents were significantly higher in WSO recovered by SCOsub.2E, up to 1901.0 and 58.5 mg/kg, respectively, in comparison with CP oil. In CP oil, the highest content of carotenoids and squalene was determined (123.8 and 31.4 mg/kg, respectively). Phytosterol summed up to 5396 mg/kg in WSO collected in 30 min of SCOsub.2E. Moreover, the highest oxidative stability was found for this oil. All studied WSOs were non-cytotoxic in lactate dehydrogenase (LDH) leaching and sulforhodamine B (SRB) assays; however, oils collected by SCOsub.2E in 15 and 30 min were found to be cytotoxic in the tetrazolium salt (MTT) test, with the CCsub.50 at a concentration of 3.4 and 5.5%, respectively. In conclusion, the composition of WSO indicates that, depending on the method of its recovery, seeds can have different bio-potencies and various applications.
Strawberries were processed to juice, nectar, wine, and puree. For investigation of the antioxidant capacity as well as the contents of ascorbic acid, total phenolics and total anthocyanins, samples ...were taken after different stages of production to determine the effects of processing. The content of vitamin C was measured spectrophotometrically. The total phenolic content was analyzed by using the Folin−Ciocalteu method, and the amount of total anthocyanins was determined by using the pH-differential method. Two different methodsthe trolox equivalent antioxidant capacity assay and the ferric reducing antioxidant power testwere used to determine the hydrophilic antioxidant capacity. This study showed the decrease of all investigated parameters within processing strawberries to different products. The content of ascorbic acid decreased with production time and processing steps, especially during heat treatment. The investigations on total phenolics in strawberry products proved fining to be a mild method to clarify berry juices and wines without removing high amounts of total phenolics. Fermentation did not lead to heavy losses of total phenolics, probably due to polymerization and condensation of monomer phenolics such as anthocyanins. Total anthocyanins and the hydrophilic antioxidant capacity decreased while using high temperatures. Anthocyanins also decreased considerably during the processing of wines, mainly caused by fermentation and pasteurization. Keywords: TEAC assay; FRAP assay; hydrophilic antioxidants; strawberry juice; strawberry wine; strawberry puree
A hyperspectral imaging system covering two spectral ranges (380–1030 nm and 874–1734 nm) was applied to evaluate strawberry ripeness. The spectral data were extracted from hyperspectral images of ...ripe, mid-ripe and unripe strawberries. The optimal wavelengths were obtained from spectra of 441.1–1013.97 and 941.46–1578.13 nm by loadings of principal component analysis (PCA). Pattern texture features (correlation, contrast, entropy and homogeneity) were extracted from the images at optimal wavelengths. Support vector machine (SVM) was used to build classification models on full spectral data, optimal wavelengths, texture features and the combined dataset of optimal wavelengths and texture features, respectively. SVM models using combined datasets performed best among all datasets. SVM models using datasets from hyperspectral images at 441.1–1013.97 nm performed better with classification accuracy over 85%. The overall results indicated that hyperspectral imaging could be used for strawberry ripeness evaluation, and data fusion combining spectral information and spatial information showed advantages in strawberry ripeness evaluation.
•Identify strawberry ripeness by hyperspectral imaging with two spectral ranges.•Both spectral and texture features were extracted for analysis.•Models on data fusion combining spectral and texture features performed best.•Models on datasets from images of 441.1–1013.97 nm performed better.
•New methodology for instance segmentation based on Mask R-CNN.•A reduced architecture for the backbone and the Mask network.•Substitution of the neural network and the non-maximum suppression ...algorithm.•New open access database for strawberry instance segmentation.•New evaluation metrics for instance segmentation methodologies.
Fruit instance segmentation is a key element for autonomous picking systems. This paper proposes a methodology for instance segmentation of strawberries using deep learning techniques. This methodology presents the following changes in relation to the well-known Mask R-CNN network: a new architecture is designed for the backbone and the mask network; the object classifier and the bounding-box regressor are removed; the non-maximum suppression algorithm is replaced with a new region grouping and filtering algorithm without increasing the order of complexity.
For this research, a new high-resolution data set of 3100 strawberry images is obtained, along with the corresponding manually-segmented ground-truth images (StrawDI_Db1 database). In addition to using widely-used metrics based on Average Precision (AP), a new performance metric is proposed: the Instance Intersection Over Union (I2oU), to assess different options of instance segmentation techniques. This material, which is published and available to the research community, allows the rigorous performance comparison between future methodologies.
The results obtained in the 200 images included in the test set show that the proposed methodology significantly reduces the inference time (10 fps vs. 5 fps) while maintaining competitive results to the original Mask R-CNN for mean AP (43.85 vs. 45.36) and mean I2oU (87.27 vs. 87.70) metrics. Thus, the proposed method can be considered as the most promising one in view of its possible integration in automatic strawberry picking systems.
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