Plant Sciences Commons^™

Results Of The Fourth International Winter Wheat Performance Nursery, J. E. Stroike, V. A. Johnson, J. W. Schmidt, P. J. Mattern, K. D. Wilhelmi

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

The Fourth International Winter Wheat Performance Nursery was grown in 1972 at 44 sites in 27 countries. Data were reported from 40 sites. The 30 cultivars grown in the nursery included 15 new entries. Twenty-nine cultivars were winter wheats; one was a spring wheat. Data are reported on grain yield, test weight, plant maturity, plant height, lodging, shattering, winter survival, 1000 kernel weight, frost damage, plant diseases, grain protein and lysine content. Two-year mean data summaries also are reported. Supplemental nursery management information is reported for each nursery site.

Purification And Characterization Of Syringacin 4-A, A Bacteriocin From Pseudomonas Syringae 4-A, William L. Haag, Anne K. Vidaver

Department of Plant Pathology: Faculty Publications

Syringacin 4-A, a bacteriocin produced by Pseudomonas syrinagae 4-A, was obtained by induction with ultraviolet irradiation or mitomycin C. Approximately 1,000-fold purification of the bacteriocin was achieved by manganous chloride precipitation, differential centrifugation, and chromatography on hydroxyapatite columns. The purified syngacin was homogeneous on hydroxyapatite columns and sucrose density gradients; it also sedimented as a single entity in the analytical ultracentrifuge. The buoyant density of purified syringacin in cesium chloride was 1.294 g/ml. The sedimentation coefficient was calculated as 120S, and the diffusion coefficient was 6.49 x 10^-8 cm²/s. The molecular weight was calculated as …

Influence Of Molecular Weights Of Bacteriophage Φ6 Double-Stranded Ribonucleic Acids On Interferon Induction, W.J. Kleinschmidt, James L. Van Etten, A. K. Vidaver

Department of Plant Pathology: Faculty Publications

The interferon-inducing capabilities of the three molecular segments of bacteriophage φ6 double-stranded ribonucleic acid increased with increasing molecular weight.

Base Composition And Hybridization Studies Of The Three Double-Stranded Rna Segments Of Bacteriophage Φ6, James L. Van Etten, A. K. Vidaver, R. K. Koski, J. P. Burnett

Department of Plant Pathology: Faculty Publications

The three double-stranded ribonucleic acid (dsRNA) segments of the bacteriophage φ6 were isolated and shown to have similar melting temperatures and base compositions. RNA: RNA hybridization experiments with the isolated segments eliminate the possibility that the two smaller dsRNA segments arise from a cleavage of the large dsRNA segment. The two smaller RNA segments reanneal rapidly even at low temperatures; in contrast, the large dsRNA reannealed only at higher temperatures. Evidence is also presented which suggests that the dsRNAs may contain a short single-stranded RNA tail.

Physiological And Morphological Correlation Of Rhizopus Stolonifer Spore Germination, James L. Van Etten, Lee Bulla Jr., Grant St. Julian

Department of Plant Pathology: Faculty Publications

Sporangiospores of Rhizopus stolonifer were examined at various stages of germination by scanning electron and phase-contrast microscopy. These observations were correlated with changes in spore dry weight, spore volume, respiration, and syntheses of ribonucleic acid, deoxyribonucleic acid, and protein during germination.

Survival Mechanisms Of Phytopathogenic Bacteria, M. L. Schuster, D. P. Coyne

Department of Plant Pathology: Faculty Publications

Natural habitats usually do not provide bacteria the continuity of agricultural crops. With continuous culture. perpetuation of pathogen is no problem. Although agricul­ tural practices provide some discontinuity between crops. it is less than that in nature. Uniformity of crop germ plasm also favors inoculum buildup and perhaps perpetuation of the pathogens.

Nitrogen Fertilisers For Pasture Production, Walter Jacob Cox, K Hawley

Journal of the Department of Agriculture, Western Australia, Series 4

At current prices nitrogen fertiliser is not an economic substitute for good clover pastures, but it can supplement the system by increasing nitrogen supply at peak growth periods. It can also provide useful increases in pasture production at critical feed times. Nitrogen usage for pasture production is still in the experimental stages and small areas should be tried before large-scale application.

The Place Of Lucerne In Western Australian Agriculture, N J. Halse, C. M. Francis

Journal of the Department of Agriculture, Western Australia, Series 4

Lucerne, the world's most important fodder legume, has never won largescale acceptance in West Australian farming, largely because of our success with productive subterranean clover pastures. But recent disease problems on sub. clover stands have led to greater interest in alternative species, especially lucerne, for higher rainfall areas.

This article summarises our knowledge of lucerne establishment and management in W.A. and reviews current research aimed at achieving better results from lucerne.

Turf Clippings Conference Proceedings, The Stockbridge School Turf Management Club

Turf Clippings

1. History of Golf (1)
2. The Nine Toughest Holes in the World (2)
3. "Stockie Madness" (3)
4. "Bartender, One More Round for Pythium" (3)
5. Panel: 1973 Turf Problems in Review - 1974 Possible Remedies (A1-A12)
6. Movement of Water to a Holding Pond (A13)
7. Maintenance of Low Budget, Short Season Golf Courses (A16)
8. Turfgrass Fertilization (A18)
9. Determining Turfgrass Fertilizer Needs (A25)
10. Shortage of Plant Food and How to Adjust to Supply and Cost (A29)
11. Panel: Tricalcium Arsenate - Use and Abuse (A33-A46)
12. Operating and Maintaining Municipal Golf Courses (A48)
13. Maintenance of a High Budget Golf Course (A51)
14. Trends in Agricultural Education and Where …

Spring 1974, J. L. Williams, M. A. Ross, T. T. Bauman, William Spence, D. S. Ralston, W. H. Daniel, Rollie Henkes

Turf Bulletin

1. Is it Really Herbicide Injury? (page 3)
2. Replenishing Our Drinking Water Supply: A Major Step Forward (5)
3. Nitrogen Supplies are Going to be Tight (9)
4. Effect of Porous Rootzone Materials Underlined with Plastic on the Growth of Creeping Betgrass (11)
5. Turf Conference Program (12)
6. Fertilizer: Have Rates Peaked? (21)
7. University of Massachusetts Turfgrass Research Fund (24)

Summer 1974, J. J. Clarke, Joseph Troll, W. R. Mullison, R. N. Carrow, Gerald Moscato

Turf Bulletin

1. The Fertilizer Fight (page 3)
2. Ammonia Production Must Receive Top Priority (4)
3. Back and Beyond (9)
4. Herbicides--Are They Safe? (10)
5. Maintenane of Poa Annua (17)
6. A Responsible Neighbor (19)
7. University of Massachusetts Turfgrass Research Fun (20)

Winter 1974, Gerald Moscato, James Bernard, Joseph Troll, Marvin D. Swart, Peter S. Loft

Turf Bulletin

1. DELEGATION--A Path to Satisfied Employees and Increased Productivity (page 3)
2. UMass Herbicide Evaluations (4)
3. Turf News (5)
4. Heating Elements (8)
5. Back and Beyond (10)
6. Turf Grass Contributions (20)

Corynebacterium Nebraskense, A New, Orange-Pigmented Phytopathogenic Species, Anne K. Vidaver, Manley Mandel

Department of Plant Pathology: Faculty Publications

A new species of Corynebacterium isolated from field corn is described. The isolates form a homogeneous group that is recognized as a new species, Corynebacterium nebraskense. The organism is characterized by orange-pig-mented colonies, inability to grow on 0.005% triphenyltetrazolium chloride agar, specific bacteriophage sensitivity, and a guanine plus cytosine content of 73.5 mol%. These and other characters differentiate this organism from other described phytopathogenic corynebacteria. The type strain of C. nebraskense is Fur-1 (= ATCC 27822 = NCPPB 2578).

Annual ('Wimmera') Ryegrass Toxicity, Geoffrey A. Pearce, O. M. Goss, P. H. Berry, J. L. Wise

Journal of the Department of Agriculture, Western Australia, Series 4

Because annual ryegrass is one of the most widespread pasture plants in Western Australia, annual ryegrass toxicity is a threat to livestock in many agricultural areas—even though the area now affected is small.

The problem is being intensively studied by the Department of Agriculture and a working group has been set up to investigate potential control measures.

In this article the group reviews the problem and reports progress in its investigations to the end of 1973.