Life Sciences Commons^™

Performance Of Green And Blanched Asparagus Cultivars In Nebraska [Abstract], Laurie Hodges, Roger Uhlinger, Ernesto Brovelli, Susan Cuppett, Anne Parkhurst

Department of Agronomy and Horticulture: Faculty Publications

Fourteen asparagus cultivars were established in 1988 in eastern Nebraska on a heavy silty clay soil to determine suitability for Nebraska production.

In Situ Ruminal Protein Degradation Of Switchgrass And Smooth Bromegrass, J. J. Mullahey, Steven S. Waller, K. J. Moore, Lowell E. Moser, Terry J. Klopfenstein

Department of Agronomy and Horticulture: Faculty Publications

Performance of livestock grazing warm-season, perennial grasses is generally greater than would be expected given their relatively low protein concentrations. Two experiments were conducted to assess ruminal escape protein using an in situ rumen technique for switchgrass (Panicum virgatum L.) and smooth bromegrass (Bromus inennis Leyss.). Whole-plant, leaf, and stem samples were harvested at specific stages of maturity in 1987. Duplicate samples of each grass were incubated for 12 h in situ. Escape protein values were expressed as concentration [grams escape protein per kilogram dry matter (DM) adjusted for acid detergent insoluble nitrogen (ADIN)] and as a percentage …

Registration Of N27 Sweetclover Germplasm, Herman J. Gorz, Francis A. Haskins, G. R. Manglitz, R. R. Smith, K. P. Vogel

Department of Agronomy and Horticulture: Faculty Publications

N27 Sweetclover [Melilotus officinalis (L.) Lam.] (Reg. no. GP-l, PI 552552) is a biennial, yellow-flowered, high-coumarin strain that was selected for large seed size and for resistance to the sweetclover aphid [,i>Therioaphis riehmi (Bornerj]. N27 was developed cooperatively by the USDA-ARS and the Nebraska Agricultural Research Division and was released in February 1991.

Registration Of N28 And N29 Sweetclover Germplasms, Herman J. Gorz, Francis A. Haskins, G. R. Manglitz, R. R. Smith, K. P. Vogel

Department of Agronomy and Horticulture: Faculty Publications

Two sweetclover [Melilotus officinalis (L.) Lam.] germplasms, N28 (Reg. no. GP-2, PI 552553) and N29 (Reg. no. GP-3, PI 552554), are improved biennial, yellow-flowered strains selected for low coumarin content (or, more accurately, for low content of o-hydroxycinnamic acid β-D-glucoside; [1]) and for resistance to the sweetclover aphid (Therioaphis riehmi Bomer). N28 and N29 were developed cooperatively by the USDA-ARS and the Nebraska Agricultural Research Division and were released in February 1991.

Methyl Jasmonate Inhibition Of Root Growth And Induction Of A Leaf Protein Are Decreased In An Arabidopsis Thaliana Mutant, Paul E. Staswick, Wenpei Su, Stephen H. Howell

Department of Agronomy and Horticulture: Faculty Publications

Jasmonic acid and its methyl ester, methyl jasmonate (MeJA), are plant signaling molecules that affect plant growth and gene expression. Primary root growth of wild-type Arabidopsis thaliana seedlings was inhibited 50% when seedlings were grown on agar medium containing 0.1 μM MeJA. An ethyl methanesulfonate mutant (jar1) with decreased sensitivity to MeJA inhibition of root elongation was isolated and characterized. Genetic data indicated the trait was recessive and controlled by a single Mendelian factor. MeJA induced polypeptides were detected in Arabidopsis leaves by antiserum to a MeJA-inducible vegetative storage protein from soybean. The induction of these proteins by …

Field Reaction Of Landrace Components Of Red Mottled Common Bacterial Blight, James S. Beaver, James R. Steadman, Dermot P. Coyne

Department of Agronomy and Horticulture: Faculty Publications

Field reaction of 25 red mottled bean ( Phaseolus vulgaris L.) genotypes to common bacterial blight [Xanthomonas campestris pv. phaseoli (Smith) Dye] was evaluated in Puerto Rico over 2 years. The average disease severity (percent leaf area with symptoms) was similar over years. The determinate red mottled genotypes had almost twice as much disease as indeterminate genotypes. Eight of the indeterminate genotypes had significantly less disease than the mean of the field experiments. These genotypes may serve as useful sources of resistance to common bacterial blight. The size of the chlorotic zone around necrotic lesions varied between growing seasons, …

Pathogenicity Of Pseudomonas Gladioli Pv. Gladioli On Rhizomatous Iris And Its Possible Role In Iris Scorch, Annie L. Wrobel, John E. Watkins, Don Steinegger

Department of Agronomy and Horticulture: Faculty Publications

Scorch of rhizomatous iris, Iris spp., occurs throughout much of the United States (Black, 1984). It is characterized as a rustcolored browning that starts on the tips of the youngest leaves in the center of the fan. Leaf necrosis progresses downward on the leaves and outward on the fan until the entire fan is affected. Roots shrivel and decay. Root cortical tissue completely deteriorates, but the epidermis and stele remain intact. The rhizome appears unaffected (Wadekamper, 1972).

Because of the sporadic occurrence of scorch and the difficulty of artificially reproducing scorch symptoms, little is known about the etiology, epidemiology, or …

Jasmonate, Genes, And Fragrant Signals, Paul E. Staswick

Department of Agronomy and Horticulture: Faculty Publications

Although first recognized for its growth-inhibiting activity about 20 years ago, JA² and its fragrant methyl ester MeJA (referred to here collectively as jasmonate) are receiving renewed interest as potentially important signaling molecules in plants. This is because jasmonate markedly increases the expression of specific plant genes, some of which are wound responsive. Similarities with fatty acid-derived stress signaling molecules in animals (1) make jasmonate of general biological interest.