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Cecilia E. McGregor and Don R. LaBonte

hard work during development of the sweetpotato ARCS_Sp02 microarray.

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D. Michael Jackson, Howard F. Harrison, Robert L. Jarret and Phillip A. Wadl

Sweetpotato, I. batatas (L.) Lam. (Convolvulaceae), is an important food crop, and breeding efforts are necessary to provide new varieties to overcome pest, disease, and climate challenges and to maintain world food production. Fortunately, there

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Wilmer A. Barrera and David H. Picha

; Nielsen, 2000 ; Padayatty et al., 2003 ; Ubbink, 2000 ). AA also has antioxidant properties that may protect the human body against reactive oxygen species ( Padayatty et al., 2003 ). Sweetpotato is considered a good source of AA and a moderate source of

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Cindy L. McKenzie and Joseph P. Albano

The sweetpotato whitefly has been reported in Florida since the late 1800s, but has only been considered a pest since 1986 when poinsettia ( Euphorbia pulcherrima ) growers began experiencing crop-damaging infestations ( Hamon and Salguero, 1987

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Peggy Ozias-Akins and Robert L. Jarret

The nuclear DNA content of 53 accessions from 24 Ipomoea (Convolvulaceae) species, including four sweetpotato cultivars, was determined by flow cytometry of DAPI-stained nuclei. Ploidy level and DNA content were significantly correlated within the genus, but more highly so within species that contained multiple cytotypes. DNA content of cultivated Z. batatas (L.) Lam. (4.8 to 5.3 pg/2C nucleus) and feral tetraploid I. batatas (3.0 to 3.5 pg/2C nucleus) was estimated from the known DNA content of chicken erythrocytes (2.33 pg), which were used as an internal standard. Tetraploid forms of Z. cordato-triloba Dennstedt also were identified. Ploidy analysis using flow cytometry is rapid and suitable for large-scale experiments such as studying the genetic structure of populations of Z. batatas and related species. Chemical name used: 4′,6-diamidino-2-phenylindole (DAPI).

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Susan L. Barkley, Jonathan R. Schultheis, Sushila Chaudhari, Suzanne D. Johanningsmeier, Katherine M. Jennings, Van-Den Truong and David W. Monks

North Carolina ranks number one in sweetpotato production in the United States. In 2014, ≈73,000 acres of sweetpotato ($354 million in gross farm value) were harvested in North Carolina [ U.S. Department of Agriculture (USDA), 2015a ], which is more

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William B. Thompson, Jonathan R. Schultheis, Sushila Chaudhari, David W. Monks, Katherine M. Jennings and Garry L. Grabow

Sweetpotato is an important crop in the United States and was worth over $716 million in gross farm value in 2015 [ U.S. Department of Agriculture (USDA), 2016a ] with North Carolina, California, Mississippi, and Louisiana farmers planting over 89

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R. Crofton Sloan Jr.

The sweetpotato foundation seed program in Mississippi is committed to producing and supplying high-quality sweetpotato seed to the Mississippi sweetpotato industry. In 1991, a study was initiated to evaluate the effects of small heteroclinal chimeras in foundation seed roots on the root flesh quality in subsequent generations. The presence of small heteroclinal chimeras in parent seed roots did not increase the number or size of chimeras in three subsequent generations of storage roots.

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Bandara Gajanayake, K. Raja Reddy, Mark W. Shankle and Ramon A. Arancibia

Sweetpotato is an important root crop grown in tropical and subtropical regions and ranks as the seventh major food crop produced annually worldwide ( Bovell-Benjamin, 2007 ; Ku et al., 2008 ). Production of sweetpotato is an important agricultural

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Evdokia Menelaou, Armen Kachatryan, Jack N. Losso, Michael Cavalier and Don La Bonte

Fresh leaves of 6 sweetpotato (Ipomoea batatas [L.] Lam.) genotypes, `Beauregard', `Bienville', L99–35, L00–8, L01–145, and L01–29, were characterized for lutein. Lutein is a carotenoid capable of delaying blindness-related macular degeneration. The content of lutein in sweetpotato ranged from 0.38 to 0.58 mg·g–1 fresh weight. Beta-carotene separated from lutein on high-pressure liquid chromatograms and when spiked in pure lutein extract did not interfere with lutein separation. High-resolution electro-spray ionization mass spectrometric analysis was used to confirm the presence of lutein in sweetpotato leaves. Stems were also characterized and found not to contain lutein. Our results showed that sweetpotato leaves are an excellent source of dietary lutein and surpass levels found in leafy crucifers. Leaves of sweetpotato and a related species are human food in some countries and may be a major source of lutein for commercial purposes.