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Jinmin Fu and Peter H. Dernoeden

), disaccharide sucrose, and various starches and fructans ( Smith, 1972 ). Fructan can be hydrolyzed into fructose, which can be converted to glucose or used to form sucrose. Mono- and disaccharides are depleted during respiration, when new leaves and roots of

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Christopher B. Cerveny, William B. Miller, and Alan G. Taylor

roots stored for 20 weeks were handled in the same manner as those stored 10 weeks, except they were planted on 2 Sept., given 4 weeks storage at 5 °C, and were moved to the greenhouse with a 20 °C constant set point temperature on 3 Oct. Percent

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Carmen Feller and Matthias Fink

characteristic pattern of depletion and accumulation of soluble carbohydrates in storage roots. Detecting deviations from the normal pattern could help to diagnose crop problems, such as unwanted excessive depletion of carbohydrates incited by harvest periods

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Xiang Wang, Ramón A. Arancibia, Jeffrey L. Main, Mark W. Shankle, and Don R. LaBonte

; Schultheis et al., 2000 ), but skin lignin/suberin content was not determined. Therefore, we hypothesize that foliar application of ethephon enhances skin lignification and/or suberization in storage roots promoting skinning resistance. The objectives of this

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Howard F. Harrison Jr, Trevor R. Mitchell, Joseph K. Peterson, W. Patrick Wechter, George F. Majetich, and Maurice E. Snook

roots of ‘Jewel’ sweetpotato, which he described using the early designation chlorogenic acids A, B, and C. Approximately 78% of the chlorogenic acids were found in the skin and outer 5 mm of storage root tissue. Analysis of the outer 3-mm layer of

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

were unequal subsample sizes of adventitious roots that met the criteria for scanning and analysis in all experiments. In each experiment, extra replicates were grown for validation of visible storage root formation at 40 d. Root image acquisition and

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Brian A. Kahn, Niels O. Maness, Donna R. Chrz, and Lynda K. Carrier

significantly affecting the concentrations of ascorbic acid, glutathione, and capsaicinoids ( Pascual et al., 2010 ). Pungency is a major determinant of quality in radish ( Raphanus sativus L.) storage roots. The pungent principle of radish storage roots was

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Arthur Villordon and Heather Carroll

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.

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Lis Sorensen and Frederick Roger Harker

Tissue properties may strongly influence the occurrence of harvest splitting in carrot (Daucus carota L.) storage roots, a disorder generally assumed to be triggered by a high water status in the storage root. Strain within the root, as well as extensibility of root tissue by using a materials testing instrument was measured. Strain was estimated after incubation of transverse root slices in water. Measurements of the gap that developed as a result of a radial cut into the center of the slice were then used to estimate strain within the root. Extensibility of strips of carrot tissue was measured through two cycles of extension and relaxation, which allowed both elastic and plastic extensibility to be determined. Strain assessment demonstrated that carrot cells have considerable potential to increase in volume when placed in water. In some roots, phloem parenchyma adjacent to the cambium expanded to a greater extent than tissues at the periphery of the root, indicating that rigidity of cells varied across the carrot radius. Tissue extensibility was predominantly elastic, indicating the cells are unlikely to dissipate some of the strain that occurs during periods of rapid water uptake through plastic deformation. However, these measurements of extensibility were related to the properties of cells along the entire 20-mm length of the tissue strip that was used. Because we demonstrated that mechanical properties can vary within a small distance, it is concluded that future studies into the mechanical properties of carrot storage root tissue will rely on empirical strain measurements.

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M. Courtney, M. Mcharo, D. La Bonte, and W. Gruneberg

diverse collection of 61 genotypes ( Courtney, 2007 ) and indicates a broad range of potential iron uptake in this present population. Table 1. Half-sibling family mean estimates for iron, zinc, and dry matter in sweetpotato storage roots