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  • Author or Editor: Ellen B. Peffley x
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A plant propagation course was developed for delivery on the World Wide Web. Plant Propagation Methods is one of two foundation courses required of students with either a major or minor in horticulture. The course is accessed via the Texas Tech Univ. Horticulture website, The delivery software is Web-CT Tutorial and access is password protected. The course has been offered two semesters, Fall 1999 and Spring 2000. Overall, student evaluations have been very favorable. The ratings for the first time offering were a 100% excellent rating was given for stimulating student interest and concepts pointed out; 67% excellent rating for effectiveness of the course, presents challenging ideas, stresses important points, uses visual materials, defines new terms, and provides an overview/objective. Students gave an overall rating of good for the organization of the course. The only negative response by the students was that they said the class was very hard because it was not in a structured classroom setting.

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Biotin- and fluorescein-labeled probe has been used to map. specific sunflower rDNA sequences by in situ hybridization on mitotic chromosomes of Allium cepa, Allium fistulosum and interspecific hybrid derivatives, There are three hybridization sites in A. cepa and more than six in an interspecific triploid. This in situ hybridization technique offers new cytogenetic markers useful in the construction of a physical genomic map of Allium and offer a means to document introgression of these genomes.

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Because of potential benefits on human health, the content of quercetin, the major flavonol found in onion (Allium cepa), could become a selection trait in breeding programs. Total flavonol concentration in onion was examined by spectrophotometric analysis at 374 nm in three long-day hybrid cultivars grown at three locations (Parma, Idaho; Grand Rapids, Mich; Elba, N.Y.), and in three shortday hybrid cultivars grown at one location in Georgia in three different fields. Mean total flavonol concentrations for long-day hybrids ranged from 176 to 232 mg·kg-1 (ppm) fresh weight and 110 to 173 mg·kg-1 fresh weight among short-day cultivars. No significant effect of location (state or field) was detected (P > 0.05). A significant (P > 0.05) cultivar by field interaction was detected in the short-day experiment, with the hybrid `Sweet Vidalia' showing significant differences among fields. Overall, our results suggest that quercetin content in onion, as expressed by the total flavonol content, does not vary depending on the growing origin, and therefore could be evaluated effectively in breeding or commercial material.

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