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Jaejoon Kim and David J. Wolyn

bags, at 5 °C, until sampling. The portion of the crown, where new buds were visible, was selected. Crowns were separated into storage roots and rhizomes. Storage roots were harvested near the rhizome in segments of ≈5 cm, weighed, and placed in a

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P.P. David, A.A. Trotman, D.G. Mortley, D. Douglas, and J. Seminara

A study was initiated in the greenhouse to examine the effects of five \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}:\mathrm{NO}_{3}^{-}\) \end{document} ratios on sweetpotato growth. Plants were grown from vine cuttings of 15-cm length, planted in 0.15 x 0.15 x 1.2-m growth channels using a closed nutrient film technique system. Nutrient was supplied in a modified half-strength Hoagland's solution with a 1:2:4 N:K ratio. \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}:\mathrm{NO}_{3}^{-}\) \end{document} ratios investigated were 100:0, 0:100, 40:60, 60:40, and a control that consisted of a modified half-Hoagland solution with an N:K ratio of 1:2:4 and an \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}:\mathrm{NO}_{3}^{-}\) \end{document} of 1:7. Treatments were initiated 30 days after planting (DAP). Sequential plant harvest began 30 DAP and continued at 30-day intervals until final harvest at 150 DAP. Results showed a linear increase in fresh storage root fresh weight until 90 DAP for all treatments. However, from 60 DAP until the end of the growing season, plants grown in a 100% \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document} solution consistently produced significantly less storage roots than in all other treatments. While all other treatments showed a decrease in storage root fresh weight after 90 DAP, plants grown in 100% \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NO}_{3}^{-}\) \end{document} and the control solution continued to increase linearly in storage root production. Storage root dry weight throughout the growing season followed similar trends to that of storage root fresh weight. Data suggest that a nutrient solution containing NO 3as its sole nitrogen source may be adequate for sweetpotato growth. This would make it possible for utilizing a one-way pH control method for nutrient solution.

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Megan J. Bowman, David K. Willis, and Philipp W. Simon

the regulation of carotenoid accumulation in carrot storage roots. Interestingly, preliminary evidence of carotenoid gene expression in non-pigmented carrot root by reverse transcriptase PCR ( Just, 2004 ) provided the first evidence that all genes in

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Don R. La Bonte, Christopher A. Clark, Tara P. Smith, and Arthur Q. Villordon

. Storage roots are elliptical without lobing and consistent in shape. Skin is light rose [10R (red) 6/4] and similar to ‘Beauregard’ clones (B-14 and B-63) (< http

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Mahmoud Panjtandoust and David J. Wolyn

sampling dates, 35 crowns from each subplot were dug and cleaned of soil. Ten of the 35 crowns were separated into rhizomes and storage roots and stored at 4 °C until further processing. Rhizomes and storage roots from five plants were lyophilized and used

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Don R. La Bonte, Christopher A. Clark, Tara P. Smith, Arthur Q. Villordon, and C. Scott Stoddard

(purple) (4/6)]. Stigmata appear purple [7.5 R (red) P (purple) (8/6)]. The five stamens are inferior to stigmata and attached to the ovary. Storage roots are round-elliptical without lobing and consistent in shape. The skin is copper [5 Y (yellow) R (red

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Don R. La Bonte, Christopher A. Clark, Tara P. Smith, Arthur Q. Villordon, and C. Scott Stoddard

(purple) (4/6)]. The five stamens are inferior to stigmata and attached to the ovary. Storage roots are elliptical without lobing and consistent in shape. The skin is red [10 R (red) P (purple) 4/6]. The ‘Burgundy’ cortex is 4 to 5 mm in depth and similar

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Arthur Villordon, Julio Solis, Don LaBonte, and Christopher Clark

environment, and the definition of “storage root initiation,” i.e., visible (enlarged storage roots) versus anatomical (appearance of anomalous cambia in adventitious roots without visible enlargement). The need for accurate prediction, inference, risk

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Lucia E. Villavicencio, Sylvia M. Blankenship, G. Craig Yencho, Judith F. Thomas, and C. David Raper

, PG and PME activities, lignin and dry matter content of the root periderm, length, weight, and diameter of storage roots, dry matter content of the biomass (leaves and stems), and yield of storage roots. There were six plants per treatment, and a

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Don R. La Bonte, Paul W. Wilson, Arthur Q. Villordon, and Christopher A. Clark

parent in breeding programs is with permission of the Louisiana State University Agricultural Center. Storage roots are mostly elliptic in Louisiana and slightly more round than ‘Beauregard’. Skin is rose [7.5 R (red) 5/6)] at harvest and fades in