scholarly journals Consumer Perception of Skinning Injury in Sweetpotatoes and Implications for Marketability: An Experimental Auction

2019 ◽  
Vol 29 (4) ◽  
pp. 468-475
Author(s):  
Alba J. Collart ◽  
Stephen L. Meyers ◽  
Jason K. Ward
Keyword(s):  
Image Analysis ◽  
Willingness To Pay ◽  
Ipomoea Batatas ◽  
Consumer Perception ◽  
Experimental Auction ◽  
Storage Roots ◽  
Incentive Compatible ◽  
Price Premiums

Skinning of sweetpotato (Ipomoea batatas) storage roots is one of the greatest concerns of sweetpotato producers. Although skinning injury is very common, the severity of the injury can vary widely. At an undefined threshold, sweetpotatoes with skinning injury are no longer sold for fresh consumption. The objectives of this study were to examine how skinning injury influences consumers’ willingness-to-pay (WTP) for sweetpotatoes and to identify differences in valuations when the extent of skinning injury is labeled. Image analysis was used to quantify skinning injury and then an incentive-compatible, nonhypothetical laboratory experimental auction was conducted to collect data on consumers’ WTP for five categories of sweetpotatoes: 0% to <1% skinning injury, 1.0% to 3.0%, 3.1% to 5.0%, 5.1% to 7.5%, and 7.6% to 10.0%. On average, consumers were willing to pay the most for sweetpotatoes with 0% to <1% skinning injury (up to $1.51/lb to $1.67/lb) and the least for sweetpotatoes with 7.6% to 10% (up to $0.76/lb to $0.85/lb), yet mean WTP values were nonzero for all skinning levels. Moreover, when the extent of skinning was labeled (relative to when they bid blindly), consumers were willing to pay price premiums for sweetpotatoes with low skinning injury levels (0% to 5%) and discounted sweetpotatoes with the highest skinning injury level (7.6% to 10.0%), suggesting that skinning levels of 7.6% and above may not be acceptable by consumers.

scholarly journals Digital Image Analysis of Sweetpotato Storage Roots in Herbicide Trials

HortScience ◽  
2002 ◽  
Vol 37 (4) ◽  
pp. 669-670 ◽  
Author(s):  
Arthur Villordon ◽  
Heather Carroll
Keyword(s):  
Image Analysis ◽  
Digital Image ◽  
Ipomoea Batatas ◽  
Digital Image Analysis ◽  
Digital Camera ◽  
Principal Component ◽  
Storage Root ◽  
Storage Roots ◽  
Size And Shape ◽  
Multivariate Procedures

Digital image analysis (DIA) was evaluated for use in assessing size and shape attributes of sweetpotato [Ipomoea batatas (L.) Lam.] storage roots in herbicide studies. Digital image files of U.S. no. 1 storage roots were taken using a digital camera. Image analysis was performed using a publicly available software package. Eight size and shape attributes were measured and subjected to univariate and multivariate procedures. DIA revealed differences for storage root width and roundness attributes. Principal component analysis suggested that storage root length, width, and roundness best described the variability of the storage root sample. The results demonstrate the potential use of DIA in augmenting data from sweetpotato herbicide trials as well as other investigations that require information about storage root size and shape responses.

scholarly journals Transcriptomic and Metabolic Profiling of High-Temperature Treated Storage Roots Reveals the Mechanism of Saccharification in Sweetpotato (Ipomoea batatas (L.) Lam.)

2021 ◽  
Vol 22 (13) ◽  
pp. 6641
Author(s):  
Chen Li ◽  
Meng Kou ◽  
Mohamed Hamed Arisha ◽  
Wei Tang ◽  
Meng Ma ◽  
...  
Keyword(s):  
High Temperature ◽  
Metabolic Pathways ◽  
Transcriptome Sequencing ◽  
Ipomoea Batatas ◽  
Sequencing Analysis ◽  
Storage Roots ◽  
Metabolic Analysis ◽  
Cooking Process

The saccharification of sweetpotato storage roots is a common phenomenon in the cooking process, which determines the edible quality of table use sweetpotato. In the present study, two high saccharified sweetpotato cultivars (Y25, Z13) and one low saccharified cultivar (X27) in two growth periods (S1, S2) were selected as materials to reveal the molecular mechanism of sweetpotato saccharification treated at high temperature by transcriptome sequencing and non-targeted metabolome determination. The results showed that the comprehensive taste score, sweetness, maltose content and starch change of X27 after steaming were significantly lower than those of Y25 and Z13. Through transcriptome sequencing analysis, 1918 and 1520 differentially expressed genes were obtained in the two periods of S1 and S2, respectively. Some saccharification-related transcription factors including MYB families, WRKY families, bHLH families and inhibitors were screened. Metabolic analysis showed that 162 differentially abundant metabolites related to carbohydrate metabolism were significantly enriched in starch and sucrose capitalization pathways. The correlation analysis between transcriptome and metabolome confirmed that the starch and sucrose metabolic pathways were significantly co-annotated, indicating that it is a vitally important metabolic pathway in the process of sweetpotato saccharification. The data obtained in this study can provide valuable resources for follow-up research on sweetpotato saccharification and will provide new insights and theoretical basis for table use sweetpotato breeding in the future.

scholarly journals Overexpression of the Golden SNP-Carrying Orange Gene Enhances Carotenoid Accumulation and Heat Stress Tolerance in Sweetpotato Plants

Antioxidants ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 51
Author(s):  
So-Eun Kim ◽  
Chan-Ju Lee ◽  
Sul-U Park ◽  
Ye-Hoon Lim ◽  
Woo Sung Park ◽  
...  
Keyword(s):  
Heat Stress ◽  
Stress Tolerance ◽  
Ipomoea Batatas ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Cauliflower Mosaic Virus ◽  
Carotenoid Content ◽  
35S Promoter ◽  
Storage Roots ◽  
Heat Stress Tolerance

Carotenoids function as photosynthetic accessory pigments, antioxidants, and vitamin A precursors. We recently showed that transgenic sweetpotato calli overexpressing the mutant sweetpotato (Ipomoea batatas [L.] Lam) Orange gene (IbOr-R96H), which carries a single nucleotide polymorphism responsible for Arg to His substitution at amino acid position 96, exhibited dramatically higher carotenoid content and abiotic stress tolerance than calli overexpressing the wild-type IbOr gene (IbOr-WT). In this study, we generated transgenic sweetpotato plants overexpressing IbOr-R96H under the control of the cauliflower mosaic virus (CaMV) 35S promoter via Agrobacterium-mediated transformation. The total carotenoid contents of IbOr-R96H storage roots (light-orange flesh) and IbOr-WT storage roots (light-yellow flesh) were 5.4–19.6 and 3.2-fold higher, respectively, than those of non-transgenic (NT) storage roots (white flesh). The β-carotene content of IbOr-R96H storage roots was up to 186.2-fold higher than that of NT storage roots. In addition, IbOr-R96H plants showed greater tolerance to heat stress (47 °C) than NT and IbOr-WT plants, possibly because of higher DPPH radical scavenging activity and ABA contents. These results indicate that IbOr-R96H is a promising strategy for developing new sweetpotato cultivars with improved carotenoid contents and heat stress tolerance.

scholarly journals The Sustainable Seafood Movement Is a Governance Concert, with the Audience Playing a Key Role

2018 ◽  
Vol 10 (1) ◽  
pp. 180 ◽  
Author(s):  
Kate Barclay ◽  
Alice Miller
Keyword(s):  
Literature Review ◽  
Willingness To Pay ◽  
Market Share ◽  
Consumer Demand ◽  
Price Premiums ◽  
Private Standards ◽  
Sustainable Seafood ◽  
Individual Actor ◽  
Qualitative Literature ◽  
Sustainable Sourcing

Private standards, including ecolabels, have been posed as a governance solution for the global fisheries crisis. The conventional logic is that ecolabels meet consumer demand for certified “sustainable” seafood, with “good” players rewarded with price premiums or market share and “bad” players punished by reduced sales. Empirically, however, in the markets where ecolabeling has taken hold, retailers and brands—rather than consumers—are demanding sustainable sourcing, to build and protect their reputation. The aim of this paper is to devise a more accurate logic for understanding the sustainable seafood movement, using a qualitative literature review and reflection on our previous research. We find that replacing the consumer-driven logic with a retailer/brand-driven logic does not go far enough in making research into the sustainable seafood movement more useful. Governance is a “concert” and cannot be adequately explained through individual actor groups. We propose a new logic going beyond consumer- or retailer/brand-driven models, and call on researchers to build on the partial pictures given by studies on prices and willingness-to-pay, investigating more fully the motivations of actors in the sustainable seafood movement, and considering audience beyond the direct consumption of the product in question.

U.S. consumer preference and willingness-to-pay for domestic corn-fed beef versus international grass-fed beef measured through an experimental auction

Agribusiness ◽  
2002 ◽  
Vol 18 (4) ◽  
pp. 491-504 ◽  
Author(s):  
Wendy J. Umberger ◽  
Dillon M. Feuz ◽  
Chris R. Calkins ◽  
Karen Killinger-Mann
Keyword(s):  
Willingness To Pay ◽  
Consumer Preference ◽  
Experimental Auction

scholarly journals Modeling the impact of sweetpotato weevils on storage root yield

2018 ◽  
Vol 3 (1) ◽  
pp. 319-325
Author(s):  
Daniel A. Akansake ◽  
Putri E. Abidin ◽  
E. E. Carey
Keyword(s):  
Ipomoea Batatas ◽  
Soft Rot ◽  
Northern Ghana ◽  
Root Yield ◽  
Storage Roots ◽  
Yield Data ◽  
Level Of Significance ◽  
Attainable Yield ◽  
The Impact ◽  
Model Approach

Abstract This study estimated the amount of loss in storage roots caused by various levels of damage caused by sweetpotato weevils (Cylas spp). Seven varieties of sweetpotato (Ipomoea batatas L. (Lam)) were evaluated in three production sites in northern Ghana for two years (2014 and 2015). Yield data for each experimental plot were collected. A regression analysis was carried out using the generalized linear model approach. In the study, nonmarketable roots were classified as all undersized roots (<100g) and spoilt roots due to weevil, millipede, and soft rot. The results indicated weevil damage as the only significant predictor of nonmarketable yield at 5% level of significance. From the study, the average values for total root yield, marketable root yield, and nonmarketable root yield were 9.39, 6.71, and 2.67 ton/ha respectively. The minimum weevil damage (score 2) resulted in a yield loss of 2 ton/ha which represents 8.3% while severe damage at score 9 could cause a loss of 7.43 ton/ha of storage roots representing 31% of the attainable yield of sweetpotato. Weevil susceptibility needs to be treated as a serious trait when evaluating sweetpotato genotypes to be released as varieties.

scholarly journals Surface Chemical Differences Between Sweetpotato Lines with Varying Levels of Resistance to the Sweetpotato Weevil

1990 ◽  
Vol 115 (4) ◽  
pp. 696-699 ◽  
Author(s):  
Ki-Cheol Son ◽  
Ray F. Severson ◽  
Richard F. Arrendale ◽  
Stanley J. Kays
Keyword(s):  
Ipomoea Batatas ◽  
Methylene Chloride ◽  
Chemical Characterization ◽  
Fused Silica ◽  
Storage Roots ◽  
Sweetpotato Weevil ◽  
Or Groups ◽  
Fused Silica Capillary ◽  
Silica Capillary Column

Methodology was developed for the extraction of surface components of sweetpotato [Ipomoea batatas (L.) Lam.] storage roots. Surface components of storage roots were quantitatively extracted with methylene chloride using 8-minute ultrasonication. After removal of the solvent, the extract was treated with 3 Tri Sil-Z:1 trimethylsilylimidazol (v/v) to convert components with hydroxyl moieties to silyl ethers and then separated on a SE-54 fused silica capillary column. Distinctly different gas chromatography profiles were found between lines displaying moderate levels of resistance (`Resisto', `Regal', `Jewel') to the sweetpotato weevil [Cylas formicarius elgantulus (summers)] and weevil-susceptible lines (`Centennial', SC 1149-19, W-115), indicating a possible role of surface components in insect response. Chromatographic fractionation techniques were developed for separation of major components or groups of components. The results will allow subsequent bioassaying for the presence of an ovipositional stimulant(s) and other weevil behavior-modulating compounds and their chemical characterization.

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