Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network

Open Access. Powered by Scholars. Published by Universities.®

Articles 391 - 405 of 405

Full-Text Articles in Entire DC Network

Asian Soybean Rust Sentinel Plots, Ralph Von Qualen, Xiao-Bing Yang Jan 2006

Asian Soybean Rust Sentinel Plots, Ralph Von Qualen, Xiao-Bing Yang

Iowa State Research Farm Progress Reports

Asian soybean rust (SBR) caused by Phakopsora pachyrhizi was discovered for the first time in the continental United States in November 2004. It was known that under the right conditions, this pathogen could spread rapidly and cause severe yield losses. There are no resistant soybean varieties available, and management requires proper timing of fungicide treatments. In addition to the impact of the disease itself, there are concerns that producers would be tempted to treat their fields unnecessarily before the fungus was present in their area, making their treatments ineffective and increasing the costs of production.


Asian Soybean Rust Sentinel Plots, Ralph Von Qualen, Xiao-Bing Yang Jan 2006

Asian Soybean Rust Sentinel Plots, Ralph Von Qualen, Xiao-Bing Yang

Iowa State Research Farm Progress Reports

Asian soybean rust (SBR) caused by Phakopsora pachyrhizi was discovered for the first time in the continental United States in November 2004. It was known that under the right conditions, this pathogen could spread rapidly and cause severe yield losses. There are no resistant soybean varieties available, and management requires proper timing of fungicide treatments. In addition to the impact of the disease itself, there are concerns that producers would be tempted to treat their fields unnecessarily before the fungus was present in their area, making their treatments ineffective and increasing the costs of production.


Farm And Weather Summary, Vincent Lawson Jan 2006

Farm And Weather Summary, Vincent Lawson

Iowa State Research Farm Progress Reports

Includes:

Farm Comments

Weather Comments


Altering The Fatty Acid Composition Of Corn Belt Corn Through Tripsacum Introgression, Susan A. Duvick, Linda M. Pollak, Jode W. Edwards, Pamela J. White Jan 2006

Altering The Fatty Acid Composition Of Corn Belt Corn Through Tripsacum Introgression, Susan A. Duvick, Linda M. Pollak, Jode W. Edwards, Pamela J. White

Food Science and Human Nutrition Publications

Breeders need sources of genes for altering the fatty acid content of oil in maize (Zea maize L.) that are not available in Corn Belt germplasm. Previously we determined lines developed from maize introgressed with genes from Tripsacum dactyloides had useful variation for fatty acid composition. We conducted this study to validate the variation, thereby showing that the trait could be transferred to Corn Belt inbreds using traditional plant breeding methods to create maize lines with altered fatty acid composition useful for an oil quality breeding program. Based on their fatty acid profiles, maize lines were selected from an open ...


2005 Crabgrass Control Trial, Lukas A. Dant, Nick E. Christians Jan 2006

2005 Crabgrass Control Trial, Lukas A. Dant, Nick E. Christians

Iowa State Research Farm Progress Reports

The objective of this study was to evaluate the efficacy of several preemergence herbicides for the control of crabgrass in Kentucky bluegrass (Poa pratensis L.) turf.


Stark Northern Prize—A Hardy Persian Walnut, Paul A. Domoto Jan 2006

Stark Northern Prize—A Hardy Persian Walnut, Paul A. Domoto

Iowa State Research Farm Progress Reports

Stark Brothers Nursery, Louisiana, Missouri, has released for sale a new walnut cultivar named Stark Northern Prize™. This tree is a cold-resistant Persian (Carpathian) walnut, Juglans regia. It was selected from a population of open-pollinated seedlings planted at the Iowa State University Horticulture Station, Ames, Iowa, in 1971 and was evaluated as ISU71-E18. In 2002, the U.S. plant patent was received for the walnut tree named Domoto. In 2005, pairs of ISU Domoto, aka Stark Northern Prize™, walnut trees were planted at the ISU research farms near Sutherland, Kanawha, Nashua, Lewis, Chariton, and Crawfordsville and at the Horticulture Station ...


Finishing Beef Cattle On Grass Supplemented With Self-Fed By-Products, Mark S. Honeyman, James R. Russell, Daniel G. Morrical, Dennis R. Maxwell, Darrell Busby, Joe Sellers Jan 2006

Finishing Beef Cattle On Grass Supplemented With Self-Fed By-Products, Mark S. Honeyman, James R. Russell, Daniel G. Morrical, Dennis R. Maxwell, Darrell Busby, Joe Sellers

Iowa State Research Farm Progress Reports

Consumers are showing increasing interest in beef from cattle that are finished or fattened on grass rather than in a conventional feedlot. Also recently, Iowa has had a proliferation of plants that produce ethanol from corn. The by-product of this process is distillers dried grains with solubles (DDGS). The objective of this study was to feed beef cattle to market weight (or as near as possible) by grazing them on cool-season grass supplemented with self-fed byproduct pellets.


Light Is Essential For Degradation Of Ribulose-1,5-Bisphosphate Carboxylase-Oxygenase Large Subunit During Sudden Death Syndrome Development In Soybean, J. Ji, M. P. Scott, M. K. Bhattacharyya Jan 2006

Light Is Essential For Degradation Of Ribulose-1,5-Bisphosphate Carboxylase-Oxygenase Large Subunit During Sudden Death Syndrome Development In Soybean, J. Ji, M. P. Scott, M. K. Bhattacharyya

Agronomy Publications

Fusarium solani f. sp. glycines (Fsg) has been reported to produce at least two phytotoxins. Cell-free Fsg culture filtrates containing phytotoxins have been shown to develop foliar sudden death syndrome (SDS) in soybean. We have investigated the changes in protein profiles of diseased leaves caused by cell-free Fsg culture filtrates prepared from Fsg isolates. Two-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis (PAGE) was conducted to investigate the protein profiles of diseased and healthy leaves. An approximately 55 kDa protein was found to be absent in diseased leaves. Matrix-assisted laser desorption-ionization time-of-flight mass spectrometric analyses and a database search revealed that the ...


Dehydrin-Like Proteins In Soybean Seeds In Response To Drought Stress During Seed Filling, N. H. Samarah, R. E. Mullen, S. R. Cianzio, P. Scott Jan 2006

Dehydrin-Like Proteins In Soybean Seeds In Response To Drought Stress During Seed Filling, N. H. Samarah, R. E. Mullen, S. R. Cianzio, P. Scott

Agronomy Publications

There is no information on accumulation of dehydrin proteins during seed development and maturation of soybean [Glycine max (L.) Merr.] in response to drought stress. Our objective was to study accumulation of dehydrin-like proteins in developing soybean seeds in response to drought stress. A greenhouse experiment and a field experiment were conducted. In the greenhouse experiment, three treatments were imposed on soybean plants after beginning of linear seed filling (R5): well-watered (WW), gradual stress (GS) imposed before severe stress, and sudden severe stress (SS). In the field treatments were irrigation (I) and nonirrigation (NI) (rainfed) conditions imposed from R ...


Breeding For Grain Amino Acid Composition In Maize, Audrey Darrigues, Kendall R. Lamkey, M. Paul Scott Jan 2006

Breeding For Grain Amino Acid Composition In Maize, Audrey Darrigues, Kendall R. Lamkey, M. Paul Scott

Agronomy Publications

Improving the amino acid balance of grain has been a long-standing objective of plant-breeding research. In this chapter, we review the history of maize breeding for improved amino acid balance. Following this, we present results of our experiments involving divergent selection for the levels of the amino acids tryptophan and methionine in random-mated populations.


Effects Of Nozzle Type And Carrier Application On The Control Of Leaf Spot Diseases Of Soybean, H. Mark Hanna, Alison E. Robertson, W. Mark Carlton, Robert E. Wolf Jan 2006

Effects Of Nozzle Type And Carrier Application On The Control Of Leaf Spot Diseases Of Soybean, H. Mark Hanna, Alison E. Robertson, W. Mark Carlton, Robert E. Wolf

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Midwestern soybean growers seek information on effective application of foliar fungicides that do not translocate throughout the plant. Field application treatments included using a two-orifice nozzle tip producing fine droplets at 187 l/ha (20 gal/ac) and 112 l/ha (12 gal/ac) and a single-orifice nozzle tip producing a coarse droplet size more typical of herbicide applications at 168 l/ha (18 gal/ac). In addition an air-assisted sprayer was used at one of the two sites of the trials. Measurements included droplet size, droplet coverage, and foliar disease severity in the top, middle, and lower parts of ...


Effect Of Environmental Factors During Seed Development And Maturation On Seed Quality In Sorghum Bicolor (L.) Moench, Vilas A. Tonapi, S. Varanavasiappan, Shrishail S. Navi, Ch Ravinder Reddy, T. V. Karivatharaju Jan 2006

Effect Of Environmental Factors During Seed Development And Maturation On Seed Quality In Sorghum Bicolor (L.) Moench, Vilas A. Tonapi, S. Varanavasiappan, Shrishail S. Navi, Ch Ravinder Reddy, T. V. Karivatharaju

Plant Pathology and Microbiology Publications

Studies were conducted to evaluate the effect of environmental conditions on physiological characteristics of seeds of sorghum genotypes viz., CO 24, CO 25, CO 26 and JH 35 during seed development and maturation. In the present study, a steady decline in moisture content of the seed was observed. Length and width of seed increased rapidly between seven to 35 days after 50 per cent flowering. A steep increase in the dry weight of seed was registered between 14 and 35 days after 50 per cent flowering, beyond that the increase was gradual. Water absorption per cent declined from 16.5 ...


Oscillating Kissing Stem-Loop Interactions Mediate 5′ Scanning-Dependent Translation By A Viral 3′-Cap-Independent Translation Element, Aurélie Mamisoa Rakotondrafara, Charlotta Polacek, Eva Harris, W. Allen Miller Jan 2006

Oscillating Kissing Stem-Loop Interactions Mediate 5′ Scanning-Dependent Translation By A Viral 3′-Cap-Independent Translation Element, Aurélie Mamisoa Rakotondrafara, Charlotta Polacek, Eva Harris, W. Allen Miller

Plant Pathology and Microbiology Publications

The 3′-untranslated regions (UTRs) of a group of novel uncapped viral RNAs allow efficient translation initiation at the 5′-proximal AUG. A well-characterized model is the Barley yellow dwarf virus class of cap-independent translation elements (BTE). It facilitates translation by forming kissing stem-loops between the BTE in the 3′-UTR and a BTE-complementary loop in the 5′-UTR. Here we investigate the mechanisms of the long-distance interaction and ribosome entry on the RNA. Upstream AUGs or 5′-extensions of the 5′-UTR inhibit translation, indicating that, unlike internal ribosome entry sites in many viral RNAs, the BTE relies on ...


Management Of Urd Bean Leaf Crinkle Virus In Urd Bean (Vigna Mungo L. Hepper), Ch Ravinder Reddy, Vilas A. Tonapi, S. Varanavasiappan, Shrishail S. Navi, R. Jarayajan Jan 2006

Management Of Urd Bean Leaf Crinkle Virus In Urd Bean (Vigna Mungo L. Hepper), Ch Ravinder Reddy, Vilas A. Tonapi, S. Varanavasiappan, Shrishail S. Navi, R. Jarayajan

Plant Pathology and Microbiology Publications

Six plant extracts viz , Mirabtlis jalapa, Carthamus roseus. Datura metal, Bougainvitlea spectabilis, Boerhaavia diffusa and Azadirachta indica recorded maximum reduction in the incidence of urd bean leaf crinkle virus (ULCV) in urd bean crops at field level Among the antiphytovirat chemicals tested, DHT reduced the transmission to the maximum extent and increased the incubation period of virus in the urd bean plant Fresh buttermilk was significantly superior to fermented buttermilk in reducing the disease spread and increasing the incubation period of the virus in the plant. Casein was found effective in reducing the per cent transmission and increased the incubation ...


Studies On Seed Colouring In Soybean And Tomato, Vilas A. Tonapi, P. Harinath Babu, S. Varanavasiappan, Ch Ravinder Reddy, Shrishail S. Navi, N. Seetharama Jan 2006

Studies On Seed Colouring In Soybean And Tomato, Vilas A. Tonapi, P. Harinath Babu, S. Varanavasiappan, Ch Ravinder Reddy, Shrishail S. Navi, N. Seetharama

Plant Pathology and Microbiology Publications

The effects of seed colouring using 25 dyes (i.e. 20 chemical and 5 natural dyes) on the quality of soyabean (cv. JS 335) and tomato (cv. Pusa Ruby) seeds were studied in the laboratory. Data were recorded for seed germination percentage, root and shoot length, whole seedling length, dry weight of seedling, vigour index, speed of germination and electrical conductivity. Rhodamine-B, Fast green and Malachite green for soyabean and Rhodamine-B and Fast green for tomato were the best dyes for seed colouring.