Sweetpotato

Permanent URI for this collectionhttp://104.225.218.216/handle/123456789/9

Articles in this collection include Cassava breeding, crop health, good agricultural practices, post harvest handling

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Bioactive compounds and antioxidant activities in peeled and unpeeled sweetpotato roots of different varieties and clones in Uganda
(Future Foods, 2022-12-10) Flora Christine Amagloh; Archileo N. Kaaya; Benard Yada; Doreen Murenju Chelangat; Arnold Katungisa; Francis Kweku Amagloh; Gaston Ampe Tumuhimbise
Rising incidences of non-communicable diseases (NCDs) in Sub-Saharan Africa (SSA) necessitates research into lo- cal functional foods, crucial in managing these conditions. This study aimed to investigate compositional changes in the bioactive compounds and antioxidant activities of peeled and unpeeled roots of Ugandan sweetpotato varieties with different flesh colours using spectrophotometric methods. Bioactive compounds and antioxidant activities, on dry weight basis were significantly higher (P<0.05) in unpeeled than peeled roots. Phenolic com- pounds were significantly higher (P = 0.001) in white, cream, and purple-fleshed roots (59.67–121.04 mg GAE/g) than in yellow and orange-fleshed roots (0.89–10.89 mg GAE/g). The deep orange-fleshed had the highest to- tal carotenoids (averagely 269.82 μg/g) and the white the lowest (averagely 8.36 μg/g). Total alkaloids in the sweetpotato roots ranged between 24.05 and 233.70 μg CE/g, below the potential toxicity range of 3–10 mg/g. The anthocyanin content of purple-fleshed roots was significantly higher (15.29 mg/g; P<0.001) than the other varieties, which ranged between 0.86 and 2.44 mg/g. Principal component analysis showed a stronger relation- ship between phenolics, anthocyanins, tannins, and ABTS radical scavenging antioxidant activity. Vitamin C and total carotenoids were more correlated with FRAP antioxidant activity. Consumption of different sweetpotato varieties with the peels could aid in managing NCDs in SSA.
Identification of the key morphological sweetpotato weevil resistance predictors in Ugandan sweetpotato genotypes using correlation and path-coefficient analysis
(Crop Science, 2023-03-16) Florence Osaru; Jeninah Karungi; Roy Odama; Doreen Murenju Chelangat; Paul Musana; Milton Anyanga Otema; Bonny Oloka; Paul Gibson; Richard Edema; Reuben Tendo Ssali; George Craig Yencho; Benard Yada
Sweetpotato weevils (SPWs) can cause up to 100% yield losses in sweetpotato (Ipomoea batatas). Nevertheless, there has been limited success in breeding for SPW resistance globally. This is attributed partly to difficulty in screening for resistance because resistance to the SPW is complex and is mediated by several resistance indicators. Measuring all these resistance indicators is costly and time consuming. To enhance efficiency in selection for SPW resistance, there is need to profile and identify key resistance indicators. Potentially, this will better enable breeders to timely and precisely select for SPW resistance. The objective of this study was to identify the most efficient morphological resistance indicators against SPW. Thirty sweetpotato genotypes that varied in resistance to SPW comprising local collections, released varieties, and breeding lines were evaluated at three locations for two seasons in Uganda using an alpha lattice design. Data were collected on storage root yield, SPW root and stem damage, and weevil resistance indicators such as vine vigor (VV), ground cover (GC), vine weight (VW), storage root neck length (NL), latex content, cortex thickness (CT), and dry matter content (DM). Genotype means for all mea- sured traits varied significantly except for CT. Negative relationships were observed between SPW root damage and GC, VW, CT, VV, NL, and DM. However, path coefficient analysis showed storage root NL (direct effect of −0.43, p < 0.001) as the most important morphological resistance indicator. Therefore, NL could be the most

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Browsing Sweetpotato by Author "Doreen Murenju Chelangat"