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Robert O.M. Mwanga, Benson Odongo, Charles Niringiye, Agnes Alajo, Putri E. Abidin, Regina Kapinga, Silver Tumwegamire, Berga Lemaga, James Nsumba and Edward E. Carey

, selected from a batch of 25 orange-fleshed sweetpotato (OFSP) clones of different origins ( Table 1 ). Both cultivars have good storage root shapes if grown in light soils, high dry matter content, and excellent consumer acceptance, especially among

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Fekadu Gurmu, Shimelis Hussein and Mark Laing

. 2015a Diagnostic assessment of sweetpotato production in Ethiopia: Constraints, post-harvest handling and farmers’ preferences Res. Crops 16 1 104 115 Gurmu, F. Hussein, S. Laing, M. 2015b The potential of orange-fleshed sweetpotato to prevent vitamin A

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Cecilia E. McGregor and Don R. LaBonte

`White Jewel' is a yellow-and-orange fleshed spontaneous mutant of the orange-flesh sweetpotato [Ipomoea batatas (L.) Lam.] cultivar Jewel. Mutations in storage root flesh color, and other traits are common in sweetpotato. The orange flesh color of sweetpotato is due to β-carotene stored in chromoplasts of root cells. β-carotene is important because of its role in human health. In an effort to elucidate biosynthesis and storage of β-carotene in sweetpotato roots, microarray analysis was used to investigate genes differentially expressed between `White Jewel' and `Jewel' storage roots. β-carotene content calculated from a* color values of `Jewel' and `White Jewel' were 20.66 mg/100 g fresh weight (FW) and 1.68 mg/100 g FW, respectively. Isopentenyl diphosphate isomerase (IPI) was down-regulated in `White Jewel', but farnesyl-diphosphate synthase (FPPS), geranylgeranyl diphosphate synthase (GGPS), and lycopene β-cyclase (LCY-b) were not differentially expressed. Several genes associated with chloroplasts were differentially expressed, indicating probable differences in chromoplast development of `White Jewel' and `Jewel'. Sucrose Synthase was down-regulated in `White Jewel' and fructose and glucose levels in `White Jewel' were lower than in `Jewel' while sucrose levels were higher in `White Jewel'. No differences were observed between dry weight or alcohol insoluble solids of the two cultivars. This study represents the first effort to elucidate β-carotene synthesis and storage in sweetpotato through large-scale gene expression analysis.

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Susan C. Miyasaka, Marisa Wall, Don LaBonte and Alton Arakaki

Twelve sweetpotato (Ipomoea batatas var. batatas) accessions/cultivars/landraces (entries) were evaluated for yield, resistance to pests, and quality in five field trials planted at Pepe`ekeo, Hawai‘i Island, and replicated over time with blocks planted on May and Oct. 2014, Feb. and July 2015, and Jan. 2016. Plots were harvested at 4.5 to 6 months after planting. In the first two field trials, local entries planted were ‘Okinawan’, ‘Mokuau’, and ‘Kona B’, as well as PI 531094, ‘Beauregard’, PI 573309, PI 573330, ‘Darby’, ‘Pelican Processor’, and ‘Picadito’. Yields of ‘Mokuau’ and ‘Kona B’ were low and were replaced in the latter three field trials with ‘Murasaki-29’ and ‘LA 08-21p’ from Louisiana State University (LSU) AgCenter, Baton Rouge. At harvest, storage roots were graded according to State of Hawai‘i standards and marketable yields included grades AA, A, and B. Then, injuries of storage roots due to infestations of sweetpotato weevil (Cylas formicarius elegantulus) in each category were estimated. Finally, sugar concentrations, anthocyanins, and β-carotene contents were measured in storage roots. Marketable fresh weight yields of entries differed significantly, with ‘LA 08-21p’ having the greatest marketable yield. However, ‘LA 08-21p’ also had the greatest incidence of damage due to sweetpotato weevil, perhaps because of its growth habit as a tight cluster of storage roots located close to the soil surface. Entries also had significantly different sugar concentrations (fructose, glucose, sucrose, maltose, and total sugars). Concentrations of sucrose ranged from 25 to 68 mg·g−1 fresh weight and were greater than those of monosaccharides analyzed. ‘Beauregard’ had the highest sucrose concentration and total sugars. Purple-fleshed cultivars Okinawan and LA 08-21p contained total monomeric anthocyanins that ranged from 34 to 37 mg/100 g dry weight. Orange-fleshed cultivars Beauregard and Darby contained β-carotene that ranged from 5485 to 8302 µg/100 g fresh weight. These results provide yields of storage roots, susceptibility to sweetpotato weevils, and amounts of antioxidants in purple- and orange-fleshed sweetpotato cultivars to growers interested in producing new sweetpotato cultivars.

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Robert O.M. Mwanga, Benson Odongo, Charles Niringiye, Agnes Alajo, Benjamin Kigozi, Rose Makumbi, Esther Lugwana, Joweria Namukula, Isaac Mpembe, Regina Kapinga, Berga Lemaga, James Nsumba, Silver Tumwegamire and Craig G. Yencho

effectiveness case study to promote orange-fleshed sweetpotato (OFSP) to alleviate vitamin A deficiency in Uganda. The OFSP high provitamin A cultivars, NASPOT 9 O and NASPOT 10 O ( Bengtsson et al., 2008 ), were given new names, ‘Vita’ and ‘Kabode

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Robert O.M. Mwanga, Gerald Kyalo, Gorrettie N. Ssemakula, Charles Niringiye, Benard Yada, Milton A. Otema, Joweria Namakula, Agnes Alajo, Benjamin Kigozi, Rose N.M. Makumbi, Anna-Marie Ball, Wolfgang J. Grüneberg, Jan W. Low and G. Craig Yencho

field resistance to sweetpotato virus disease (SPVD) and alternaria bataticola blight. The two cultivars were bred targeting development of vitamin A–rich (biofortified) orange-fleshed sweetpotato (OFSP). OFSP have been shown to be both effective for

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Maria I. Andrade, Abilio Alvaro, Joana Menomussanga, Godwill S. Makunde, José Ricardo, Wolfgang J. Grüneberg, Raúl Eyzaguirre, Jan Low and Rodomiro Ortiz

-carotene levels, and drought adaptation. Orange-fleshed sweetpotato (OFSP) cultivars alleviate vitamin A deficiency in African rural households ( Hotz et al., 2012 ; Low et al., 2007 ). Furthermore, sweetpotato needs in southern Africa a critical amount of vine

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Silver Tumwegamire, Regina Kapinga, Patrick R. Rubaihayo, Don R. LaBonte, Wolfgang J. Grüneberg, Gabriela Burgos, Thomas zum Felde, Rosemary Carpio, Elke Pawelzik and Robert O.M. Mwanga

Breeding crops for micronutrient density: A case for and current status, of orange-fleshed sweetpotato Faber M. Laurie S.M. van Jaarsveld P.J. Proc. of orange-fleshed sweetpotato symposium Pretoria, South Africa Lebot, V. Champagne, A. Malapa, R. Shiley, D

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Rukundo Placide, Hussein Shimelis, Mark Laing and Daphrose Gahakwa

value of orange-fleshed sweetpotato is known by farmers but cultivars with white flesh color dominate other cultivars. Sweetpotato farming practices. Farmers grew sweetpotato on ridges (48.1%), flat ground (37.5%), or mounds (14.4%). Approximately 40

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Damien Shumbusha, Jean Ndirigwe, Lydia Kankundiye, Anastasie Musabyemungu, Daphrose Gahakwa, Phanuel S. Ndayemeye and Robert O.M. Mwanga

released cultivars, RW11-2910 and RW11-2560, are orange-fleshed sweetpotato (OFSP), providing consumers with moderate to high beta-carotene (provitamin A) with potential to alleviate vitamin A deficiency. Thus, the official release of these dual