Search Results

You are looking at 1 - 10 of 13 items for :

  • "ground spot" x
Clear All
Free access

Edgar L. Vinson III, Floyd M. Woods, Joseph M. Kemble, Penelope Perkins-Veazie, Angela Davis and J. Raymond Kessler

predictor, of fruit maturity ( Kano et al., 2008 ; Young et al., 1993 ). A number of subjective systems have been used by growers, including ground spot yellowness, senescent tendril next to the fruit pedicel, change in fruit wax (loss of shine), and

Free access

P. Perkins-Veazie and J.K. Collins

The red flesh of watermelon contains lycopene, a pigment with antioxidant properties that help prevent certain types of cancers. This experiment was done to determine cultivar variation in lycopene content, and the effectiveness of colorimetric measurements for predicting lycopene content. Ten ripe melons per cultivar of hybrid, open-pollinated, and triploid types were selected from field plantings at Lane, Okla. Melons were cut transversely and color measured with a colorimeter at three heart and three locule sites, in a counterclockwise rotation starting at the ground spot. For lycopene content, a 100-g sample of heart tissue was removed, extracted with a hexane-acetone-ethanol mixture, and lycopene concentration measured spectrophotometrically at 503 nm. Lycopene content varied among cultivars, from 33.96 μg·g–1 in `Crimson Sweet' to 66.15 μg·g–1 in `Crimson Trio'. Chroma and “a” colorimeter values were highly correlated with lycopene content (P < 0.001). Linear and quadratic regression of lycopene against colorimeter values yielded an R 2 of 0.55. Results indicate that, like tomatoes, watermelon cultivars vary widely in lycopene content. Colorimeter readings did not adequately predict lycopene values.

Free access

Gabriele Gusmini and Todd C. Wehner

Watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai] is a diverse crop, with much variability for fruit and seed traits. This study measured the inheritance of scarlet red flesh color, egusi seed type, yellow belly (ground spot) rind pattern, and intermittent stripes on the rind. Scarlet red is a dark red flesh color found in `Dixielee' and `Red-N-Sweet'. Egusi seed is an unusual mutant having a fleshy pericarp adherent to the seed coat found in PI 490383 and PI 560006. Yellow belly is found in `Black Diamond, Yellow Belly'. Intermittent stripes are found in `Navajo Sweet', which has narrow dark stripes that are irregular or nearly absent across the fruit. In order to study the inheritance of these traits, six generations, including parents, crosses, and backcrosses (Pa, Pb, F1, F2, BC1Pa, BC1Pb), were produced in each of seven crosses. Phenotypic data were recorded in the field, and analyzed with the Chi-square method for the segregation of Mendelian genes. Scarlet red color in `Dixielee' was allelic to scarlet red color in `Red-N-Sweet'. Four new genes were identified and named, in conformance with gene nomenclature rules for Cucurbitaceae: Scr for scarlet red, eg for egusi seed, Yb for yellow belly, and ins for intermittent stripes. Thus, we have added four new genes to the 52 morphological and disease resistance genes already published.

Free access

George E. Boyhan, Gerard Krewer, Darbie M. Granberry, C. Randell Hill and William A. Mills

to 7 kg at maturity. The fruit has a pronounced yellow ground spot. Fig. 1. Examples of ‘Bulldog’ fruit, which show the variability in the fruit as well as the distinctive ground spot that is visible on some. In the summer and fall of

Free access

Javier Obando, Juan Pablo Fernández-Trujillo, Juan Antonio Martínez, Antonio Luis Alarcón, Iban Eduardo, Pere Arús and Antonio José Monforte

Inodorus group (such as PS-type) because consumers relate well-formed netting to an optimum stage of maturity ( Ryall and Lipton, 1983 ; Seymour and McGlasson, 1993 ; Taha et al., 2003 ). The ground spot color (i.e., part of the fruit in contact with the

Full access

P.R. Johnstone, T.K. Hartz and D.M. May

equatorial slice of ≈3 cm wide was collected, and all measurements were made on middle mesocarp tissue midway between the ground spot and the top of the fruit. Firmness was determined using a manually operated penetrometer (Western Industrial Supply, San

Free access

Lingli Lou and Todd C. Wehner

solid colored, there are additional modifications to watermelon rind, such as the netted reticulations within stripes or on the whole fruit surface, mottling (irregularly shaped light color) on the otherwise solid dark-colored background, ground spot

Full access

Chen Jiang, Penelope Perkins-Veazie, Guoying Ma and Christopher Gunter

areas on the fruit surface, the ground spot (bottom) and the surface away from the ground spot (top), using a 1 to 6 scale with 1 being extremely green and 6 being extremely yellow/brown. Color ratings from the top and bottom of each melon were averaged

Free access

Angela R. Davis, Charles L. Webber III, Wenge Liu, Penelope Perkins-Veazie, Amnon Levi and Stephen King

summer of 2007 and were harvested throughout the season. All full-sized fruit (n = 570) were weighed and then cut through the ground spot. Length and width were measured on approximately half the fruit harvested and was only measured on fully ripe fruit

Full access

Matthew B. Bertucci, Katherine M. Jennings, David W. Monks, Jonathan R. Schultheis, Penelope Perkins-Veazie, Frank J. Louws and David L. Jordan

determined by scouting for a dried tendril where the fruit meets the vine, a well-developed ground spot where the fruit contacts the soil surface, ridges extending along the rind of the melon, and a breakdown of epicuticular wax and hairs on the fruit surface