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1999

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Articles 61 - 69 of 69

Full-Text Articles in Agricultural Science

Report Of The Cucurbit Working Group, James D. Mccreight, Jack Staub Jan 1999

Report Of The Cucurbit Working Group, James D. Mccreight, Jack Staub

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Cucumber (Cucumis sativus L.) originated in India, melon (C. melo L.) and watermelon (Citrullus lanatus) in Africa, and squash, pumpkin, and gourd (Cucurbita spp.) in the Americas. Thus, cucumber, melon, and watermelon (including citron) are relatively recent introductions to the New World. Most domesticated species of Cucurbita were introduced from Mexico, Central America, and South America with the migration of native Americans centuries earlier. Wax gourd (Benincasa hispida (Thunb.) Logr.) is from Southeast Asia. Bottle gourd (Lagenaria siceraria (Molina) Stand.) is of African origin. South Asia is the probable center of …

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Physical Mapping Of The Bovine, Caprine And Ovine Homologues Of The Paired Box Gene Pax8, N. L. Lòpez-Corrales, T. S. Sonstegard, T. P. L. Smith Jan 1999

Physical Mapping Of The Bovine, Caprine And Ovine Homologues Of The Paired Box Gene Pax8, N. L. Lòpez-Corrales, T. S. Sonstegard, T. P. L. Smith

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The PAX8 gene, a member of the human paired box gene family, was mapped by FISH to chromosome 11 in cattle and goat and to the short arm of chromosome 3 in sheep. The cytogenetic position of PAX8 on BTA 11 and on its homologue OAR 3p lies in the region where the interleukin beta (IL1B) gene has been previously located, (BTA 11q22.1→q22.3 and OAR 3p25→q26 respectively; Lòpez-Corrales et al., 1998). The results indicated that PAX8 as well as interleukin beta and interleukin alpha (IL1B and IL1A) genes detected on the human chromosome segment HSA 2q13→q21 maintain a similar …

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Analysis Of Human Skin Emanations By Gas Chromatography/Mass Spectrometry. 1. Thermal Desorption Of Attractants For The Yellow Fever Mosquito (Aedes Aegypti) From Handled Glass Beads, Ulrich R. Bernier, Matthew M. Booth, Richard A. Yost Jan 1999

Analysis Of Human Skin Emanations By Gas Chromatography/Mass Spectrometry. 1. Thermal Desorption Of Attractants For The Yellow Fever Mosquito (Aedes Aegypti) From Handled Glass Beads, Ulrich R. Bernier, Matthew M. Booth, Richard A. Yost

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Handled glass has the ability to collect and concentrate nonaqueous human skin emanations while minimizing the collection of aqueous perspiration. Compounds originating from the skin and collected on glass have previously been found to attract the Aedes aegypti species of mosquito. Therefore, glass beads were used as the medium to collect skin emanations from humans for subsequent chemical analysis. This process consisted of a 5-15-min collection of sample on glass beads, followed by loading the beads into a gas chromatograph (GC) injector insert for subsequent desorption of the collected compounds onto the GC column. After cryofocusing by liquid nitrogen at …

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Midseason Stalk Breakage In Corn As Affected By Crop Rotation, Hybrid, And Nitrogen Fertilizer Rate, Wallace Wilhelm, Mark A. Liebig, Gary E. Varvel, Tracy M. Blackmer Jan 1999

Midseason Stalk Breakage In Corn As Affected By Crop Rotation, Hybrid, And Nitrogen Fertilizer Rate, Wallace Wilhelm, Mark A. Liebig, Gary E. Varvel, Tracy M. Blackmer

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

In July of 1993 and 1994, southern Nebraska experienced devastating windstorms, with winds estimated to exceed 45 m s-1. These storms resulted in severe brittle-snap of corn (Zea mays L.), with stalks breaking near the primary ear node in the basal portion of an elongating internode. In the storm path were several experiments established on a Hord silt loam (Cumulic Haplustolls) to determine the effect of selected management practices (crop rotation, hybrid selection, planting date, and N fertilization) on nitrate leaching to ground water from irrigated cropland. After the storms, the number of broken plants was determined …

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Report Of The Berry Working Group (Strawberry, Raspberry/Blackberry, Blueberry), Erin Rosskopf Jan 1999

Report Of The Berry Working Group (Strawberry, Raspberry/Blackberry, Blueberry), Erin Rosskopf

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Strawberries are a relatively recently domesticated crop. The most commonly cultivated strawberry, Fragaria x ananassa, is a hybrid of the North American F. virginiana and the South American F. chiloensis (Maas 1998). These parental species are still grown in some areas and F. virginiana is the primary wild, sexually compatible relative to the cultivated strawberry. In addition to F. virginiana, F. vesca and its subspecies are also present in the United States. Fragaria x ananassa and F. virginiana readily cross. Introgression of pest resistance traits into the wild strawberry population is likely, as substantial amounts of crop-weed introgression …

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Report Of The Turfgrasses Working Group, Hector Quemada Jan 1999

Report Of The Turfgrasses Working Group, Hector Quemada

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Over 30 species of grasses are utilized for turf (Huff 1998), while others are important in agriculture as forage crops. The commercial value of this group of plants makes them attractive for improvement through modern genetic engineering techniques (Johnson and Riordan, in press). Because of the diversity of species and the consequent differences in biology among them, broad generalizations regarding the ecological effects of pest resistance genes introduced into these crops cannot be made. Rather, questions regarding the potential for pest resistance genes must be directed toward specific cases in which the species and the particular introduced gene are known. …

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Paternity Efficiency In Turkeys Differes Extensively After Hererospermic Insemination, Ann M. Donoghue, Murray R. Bakst, Paul Drummond, Shakura Haqque, Edward J. Smith, Daniel J. Donoghue Jan 1999

Paternity Efficiency In Turkeys Differes Extensively After Hererospermic Insemination, Ann M. Donoghue, Murray R. Bakst, Paul Drummond, Shakura Haqque, Edward J. Smith, Daniel J. Donoghue

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

All commercial turkey hens in the U.S. are bred by artificial insemination (AI).  Since semen samples are pooled from 10 or more males (heterospermic inseminations), paternity of the progeny is rarely known.  Whereas it is known that sperm competition exists, the degree to which any male's sperm fertilizes ova relative to other male's remains unknown.  In this work, we determined individual male fecundity relative to that of other males in the study and attempted to establish a relationship between male fecundity and semen characteristics in turkeys.  Fingerprinting of genomic DNA from parents and offspring was used to determine parentage efficiency. …

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Efficacy Of Neem Seed Derivatives Against Nematodes Affecting Banana, T. Musabyimana, R. C. Saxena Jan 1999

Efficacy Of Neem Seed Derivatives Against Nematodes Affecting Banana, T. Musabyimana, R. C. Saxena

All Peer-Reviewed Publications

Soil applications of powdered neem seed or neem cake at 100 g/plant at planting and, subsequently, at 3-month intervals, reduced the populations of Pratylenchus goodeyi Sher and Allen and Meloidogyne spp. on par with Furadan 5G (carbofuran) applied at 40 g/plant at planting and then at 6-month intervals to banana plants grown in 100-l containers with controlled levels of banana nematode infestations. Eight months after planting, banana plants treated with powdered neem cake, seed or kernel or with neem oil had 4 to 95 times fewer parasitic nematodes than the untreated control. However, only neem cake powder or neem seed …

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Genetic Relationships Among Subspecies Of Vigna Unguiculata (L.) Walp. Based On Allozyme Variation, R. S. Pasquet Jan 1999

Genetic Relationships Among Subspecies Of Vigna Unguiculata (L.) Walp. Based On Allozyme Variation, R. S. Pasquet

All Peer-Reviewed Publications

The cowpea [Vigna unguiculata (L.) Walp.] is a morphologically and genetically variable species composed of wild perennial, wild annual, and cultivated forms that are mainly used for edible seeds and pods. In this study, genetic variation in 199 germplasm accessions of wild and cultivated cowpea was evaluated using an allozyme analysis. The results from this survey showed that wild cowpea exhibits genetic variation perfectly fitted with the existing morphological classification. The cowpea gene-pool is characterized by its unusually large size. It encompasses taxa (ranked as subspecies) that could be considered as different species considering the high genetic distances observed between …

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