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Guo-qing Song, Hideo Honda and Ken-ichi Yamaguchi

sweet potato [ Ipomoea batatas (L.) Lam.] following the introduction of granule-bound starch synthase I cDNA Plant Cell Rept. 20 663 666 Kretsch, T. Emmler, K. Schäfer, E. 1995 Spatial and temporal pattern

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Peter B. Ojong, Victor Njiti, Zibao Guo, Ming Gao, Samuel Besong and Sandra L. Barnes

.X. Terahara, N. Yamakawa, O. 2003 Potential chemopreventative properties of anthocyanin-rich aqueous extracts from in vitro produced tissue of sweetpotato ( Ipomoea batatas L.) J. Agr. Food Chem. 51 5916 5923

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Julio Solis, Arthur Villordon, Niranjan Baisakh, Don LaBonte and Nurit Firon

sweetpotato J. Amer. Soc. Hort. Sci. 138 1 7 Eguchi, T. Yoshida, S. 2008 Effects of application of sucrose and cytokinin to roots on the formation of tuberous roots in sweetpotato [ Ipomoea batatas (L.) Lam.] Plant Root 2 7 13 Ekanayake, I.J. Dodds, J.H. 1993

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Nicholas A. George, Kenneth V. Pecota, Blake D. Bowen, Jonathan R. Schultheis and G. Craig Yencho

. Shibayama, H. Hoque, A. 2002 Seedling growth and their field performance of sweet potato ( Ipomoea batatas (L.) Lam.) using cut pieces of the tuberous roots (in Japanese) Rpt. Kyushu Branch Crop Sci. Soc. Jpn. 68 77 81 Belehu, T. Hammers, P.S. Robbertse, P

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Malkeet S. Padda and David H. Picha

.H. 2007 Methodology optimization for quantification of total phenolics and individual phenolic acids in sweetpotato ( Ipomoea batatas L.) roots J. Food Sci. 72 C412 C416 Padda, M.S. Picha, D.H. 2008a Effect of low

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Victor N. Njiti, Qun Xia, Leonna S. Tyler, Lakeisha D. Stewart, Antione T. Tenner, Chunquan Zhang, Dovi Alipoe, Franklin Chukwuma and Ming Gao

sativum L.) treated with prohexadione calcium and Daminozide Acta Biol. Cracov. Ser.; Bot. 50 55 62 Lowe, S.B. Wilson, L.A. 1974 Comparative analysis of tuber development in six sweet potato [ Ipomoea batatas (L.) Lam] cultivars Ann. Bot. (Lond.) 38 307

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Susan C. Miyasaka, Sharon Motomura-Wages, Ishakh Pulakkatu-Thodi, Michael J. Melzer, Christopher A. Clark, Don R. LaBonte and Arthur Q. Villordon

factors Intl. J. Pest Mgt. 49 131 140 Stevenson, P. Muyinza, H. Hall, D.R. Porter, E.A. Farman, D.I. Talwana, H. Mwanga, R.O.M. 2009 Chemical basis for resistance in sweetpotato Ipomoea batatas to the sweetpotato weevil Cylas puncticollis Pure Appl

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J.R. Bohac

Sweetpotato, Ipomoea batatas is in the morning glory family, Convolvulaceae, genus Ipomoea, group Batatas. It has many wild Ipomoea relatives that serve as a reservoir of many needed pest and stress-resistance genes. A major barrier to introgression of useful genes is the ploidy gap—sweetpotato is a hexaploid and wild Ipomoeas are diploids and tetraploids. The wild species can be successfully crossed using 2n pollen or by first increasing ploidy by colchicine treatment. The ploidy of such hybrid offpsring can be determined by DNA flow cytometry. My objective was to develop a technique to determine DNA content in Ipomoea and values for DNA content for the major Ipomoea species using the EPIC flow cytometer with a UV detector. Nuclei were extracted and pretreated with cellulase and pectolyase before staining with propidium iodide (PI). A highly linear relationship was found between the DNA content determined by DNA flow cytometry and the ploidy of the closest sweetpotato relatives as determined by chromosome counts. These species were diploid I. trifida, tetraploid I. batatas, and hexaploid I. batatas. DNA content was most similar among other diploid Ipomoea species in the group Batatas and was significantly different in other Ipomoeas not in group Batatas.

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Jun Tang, Kang-Di Hu, Lan-Ying Hu, Yan-Hong Li, Yong-Sheng Liu and Hua Zhang

Sweetpotato [ Ipomoea batatas (L.) Lam] is grown in regions ranging from the tropics to the subtropics and ranks sixth or seventh among the most important food crops in the world ( Scott, 1992 ). Fleshy storage roots of sweetpotato are used as a

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David Wees, Philippe Seguin, Josée Boisclair and Chloé Gendre

, Birmingham, AL Novak, B. Žutić, I. Toth, N. Dobričević, N. 2007 Sweet potato [ Ipomoea batatas (L.) Lam] yield influenced by seedlings and mulching Agr. Conspectus Scientificus 72 357 359 Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) 2010