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Nebline, May 2001 May 2001

Nebline, May 2001

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Crop Genetic Engineering – 101
StarLink Corn—What is All the Fuss About?
Think About Apple Maggot Control Now
Three All-America Rose Selections Winners for 2001
Mulches
Perennials with Unique Flowers
Horticulture information center
It’s Springtime: Watch for Signs of Termites
We Love the Birds, But Sometimes They Drive Us Crazy!
Insects, Spiders, Mice and More
Reminder!! Household Hazardous Waste Collection for Lancaster County Residents
Controlling Volunteer StarLink™ corn
BSE (Mad Cow) and Foot & Mouth Disease, Ending the Confusion!!!
Strategic Mowing Helps Lawns Grow Healthfully
Trellis Construction
Healthy Tomatoes Result of Planning, Care
Suiting the Garden to the Gardener
Healthy …


Ecology Of Treeline Whitebark Pine (Pinus Albicaulis) Populations In Central Idaho: Successional Status, Recruitment, And Mortality, And A Spring Temperature Reconstruction From Whitebark Pine Tree Rings, Dana Lee Perkins May 2001

Ecology Of Treeline Whitebark Pine (Pinus Albicaulis) Populations In Central Idaho: Successional Status, Recruitment, And Mortality, And A Spring Temperature Reconstruction From Whitebark Pine Tree Rings, Dana Lee Perkins

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This research investigated the successional status of treeline whitebark pine (Pinus albicaulis) populations on 14 stands in central Idaho and used empirical statistical models to determine the principal factors affecting recruitment and mortality. The longest lived whitebark pines from four additional high-elevation sites were used to develop a tree-ring chronology to reconstruct over 1,000 years of average April-May temperature.

The assessment of stand structures using size-frequency distributions generally provides evidence that treeline whitebark pine populations are currently self-sustaining in areas of low to nonexistent incidence of white pine blister rust (Cronartium ribicola). However the presence of …


Mutations In The Csgd Promoter Associated With Variations In Curli Expression In Certain Strains Of Escherichia Coli O157:H7, Gaylen A. Uhlich, James E. Keen, Robert O. Elder May 2001

Mutations In The Csgd Promoter Associated With Variations In Curli Expression In Certain Strains Of Escherichia Coli O157:H7, Gaylen A. Uhlich, James E. Keen, Robert O. Elder

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

Single-base-pair csgD promoter mutations in human outbreak Escherichia coli O157:H7 strains ATCC 43894 and ATCC 43895 coincided with differential Congo red dye binding from curli fiber expression. Red phenotype csgD::lacZ promoter fusions had fourfold-greater expression than white promoter fusions. Cloning the red variant csgDEFG operon into white variants induced the red phenotype. Substrate utilization differed between red and white variants.


Erythropoietin Mrna Expression In Pig Embryos, H. G. Klemcke, J. L. Vallet, R. K. Christenson, P. L. Pearson Apr 2001

Erythropoietin Mrna Expression In Pig Embryos, H. G. Klemcke, J. L. Vallet, R. K. Christenson, P. L. Pearson

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

To address whether altered erythropoietin (EPO) synthesis might be involved in prenatal pig mortality, studies were conducted to measure porcine embryonic EPO mRNA expression during early gestation (days 24–40). Three pig models differing in embryonic survival from days 24–40 were investigated: intact white crossbred gilts (INT), white crossbred gilts that were unilaterally hysterectomized-ovariectomized before puberty and whose pregnant uterus constituted a crowded environment (UHO), and prolific, intact Meishan gilts (ME). A partial cDNA for porcine EPO, developed via reverse transcription and polymerase chain reaction procedures was used to generate a 32P-labeled probe for use in Northern analyses. In an initial …


Center For Grassland Studies Newsletter, Spring 2001, Volume 7, No. 2 Apr 2001

Center For Grassland Studies Newsletter, Spring 2001, Volume 7, No. 2

Center for Grassland Studies: Newsletters

Contents:

Windrow Grazing and Baled-Hay Feeding Strategies for Wintering Calves by Jerry Volesky, Don Adams, and Richard Clark, WCREC, UNL

Dull Mower Affects Turf in More Ways than Appearance by Don Steinegger and Bob Shearman, Department of Agronomy and Horticulture, UNL

Nebraska Grazing Conference August 13-14

“Backyard Farmer” Available on Internet

“Arbor Links” -- Dream Becomes Reality

Sampson Fellowship Award

UNL Hosts First Day of Issue Ceremony for Great Plains Prairie Stamp


Forage News [2001-04], Department Of Plant And Soil Sciences, University Of Kentucky Apr 2001

Forage News [2001-04], Department Of Plant And Soil Sciences, University Of Kentucky

Forage News

  • Sign Up Now for 2001 Spring Kentucky Grazing School
  • Clover Selection Guidelines
  • Alfalfa Seedings up in 2000
  • Roundup Ready Alfalfa-A Progress Report
  • Distance Cattle Travel to Water Affects Pasture Utilization Rate
  • Hybrid Alfalfa Promoted in Popular Press
  • Disk vs. Sicklebar Mowers
  • Controlled Grazing
  • Upcoming Events


Nebline, April 2001 Apr 2001

Nebline, April 2001

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Human Diseases and Wildlife: Implications for Nebraska
Plant a Tree
Mom’s Day Garden
Annual Vines in the Landscape
What day is Arbor Day?
Summer Patch of Turfgrass
Horticulture information center
Termite Workshop on May 22
Household Hazardous Waste Collections for 2001
Safely Clean up After Rodents
Cans for Books
Test Soils for Nitrates; Adjust Application Rate Accordingly
Reduce Nitrogen and Maintain Yields; Multi-plot Research Results Show the Thresholds
Graze Conservatively Following Drought Year
Farm Labor
Diazinon Phase-Out Beginning
Lincoln Iris Society
Aerate Lawn to Improve Air Flow
How to Drive a Staple
Composting Workshops and Demonstrations for 2001
Anderson’s Post …


The Prairie Naturalist Volume 33, No.1 March 2001 Mar 2001

The Prairie Naturalist Volume 33, No.1 March 2001

The Prairie Naturalist

VEGETATION STRUCTURE AND INVERTEBRATE BIOMASS OF CONVENTIONAL AND SUSTAINABLE SORGHUM FIELDS IN KANSAS ▪ R. J. Robel and C Xiong

MONTHLY OPEN-WATER BOTTOM TRAWLING AT TWO SOUTH DAKOTA LAKES ▪ B. G. Blackwell and M. L. Brown

WINTER SURVIVAL AND HOME RANGE OF FEMALE RING-NECKED PHEASANT IN RELATION TO FOOD' PLOTS ▪ A E. Gabbert, J. R. Purvis, L. D. Flake, and A P. Leif

THIRD BREEDING RECORD OF BLUE GROSBEAK IN NORTH DAKOTA ▪ K. H. Haas and C A Haas

EVIDENCE OF AMERICAN WOODCOCK NESTING IN SOUTHEASTERN NORTH DAKOTA ▪ F. Y Sargeant and G. A Sargeant

BOOK …


Nebline, March 2001 Mar 2001

Nebline, March 2001

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Earth wellness festival! In its seventh year!
Curbside Recycling Offered Through NDEQ Grant!
Youth Are Making A Difference!
Coloring Eggs with Natural Dyes
Perennial Plant of the Year 2001
Purchasing Trees for Landscape Planting
Horticulture information center
Easter Lily Care
Increased Landfill Rates Are Still A Bargain
Are you Ready for Some Spring Invaders?
Where Wastes Should Go in Lancaster County: Suggest Disposal Options
Stunned by Fuel Bills? Reduce Energy Consumption
Termite Workshop on May 22
Following NU Nitrogen Recommendations Can Help Producers Cope with Fertilizer Costs
What do we Really Know About BSE “Mad Cow Disease”
Poor Germination and …


Plant-Derived Oils Reduce Pathogens And Gaseous Emissions From Stored Cattle Waste, Vincent H. Varel, Daniel N. Miller Mar 2001

Plant-Derived Oils Reduce Pathogens And Gaseous Emissions From Stored Cattle Waste, Vincent H. Varel, Daniel N. Miller

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

Carvacrol and thymol in combination at 6.7 mM each completely inhibited the production of short-chain volatile fatty acids and lactate from cattle waste in anoxic flasks over 23 days. Fecal coliforms were reduced from 4.6 x 106 to 2.0 x 103 cells per ml 2 days after treatment and were nondetectable within 4 days. Total anaerobic bacteria were reduced from 8.4 x 1010 to 1.5 x 107 cells per ml after 2 days and continued to be suppressed to that level after 14 days. If the concentration of carvacrol or thymol were doubled (13.3 mM), either …


Alfalfa As A Cash Hay Crop, John Nowak Feb 2001

Alfalfa As A Cash Hay Crop, John Nowak

Kentucky Alfalfa and Stored Forage Conference

Over the years we have all learned of the great potential alfalfa has as a forage crop in Kentucky. We have seen it used as hay, haylage and even pasture. Many aspects of our agri-business community have alfalfa as an important part of their business.


Alfalfa For Beef Cattle, W. Roy Burris Feb 2001

Alfalfa For Beef Cattle, W. Roy Burris

Kentucky Alfalfa and Stored Forage Conference

Alfalfa is sometimes said to be "too good" for beef cattle. Although it's nutritional value may sometimes exceed beef cows' needs, to dismiss it's potential for beef cattle would be a mistake. Alfalfa can be useful as a harvested feed or as a grazing crop.


Alfalfa For Dairy Cattle, Donna M. Amaral-Phillips Feb 2001

Alfalfa For Dairy Cattle, Donna M. Amaral-Phillips

Kentucky Alfalfa and Stored Forage Conference

Alfalfa is known as the queen of the forage crops and for good reasons. Alfalfa is an excellent forage for dairy cattle because it provides nutrients needed by dairy cows in a package which is highly digestible and cost effective. Alfalfa can be grazed directly by cattle or harvested as hay, haylage, or batage. Dairy farmers will purchase locally-grown hay if it is high quality (RFV greater than 150). When marketing cash hay one needs to understand that the quality of alfalfa greatly impacts milk production and economics of a dairy operation. This impact is felt even when as little …


Alfalfa Hay For Horses, Laurie Lawrence Feb 2001

Alfalfa Hay For Horses, Laurie Lawrence

Kentucky Alfalfa and Stored Forage Conference

Horse owners frequently mention cleanliness, color and cutting when it comes to choosing hay. Cleanliness should be the most important factor in selecting horse hay. Hay that contains dust or mold can inflame the respiratory tract. It is also possible for hay mold to affect other systems in the horse such as the digestive system and liver. Some horses suffer from a chronic respiratory condition that seriously impairs their ability to breathe normally. This condition, commonly known as heaves, worsens when horses are fed moldy or dusty hay. Horses with heaves are exercise intolerant and thus have little value except …


Reducing The Risk Of Bloat, Patty Scharko Feb 2001

Reducing The Risk Of Bloat, Patty Scharko

Kentucky Alfalfa and Stored Forage Conference

Bloat refers to excessive accumulation of gas in the rumen. Bloat results when an animal can not eructate or "belch up" gases produced in the process of rumen fermentation. The gas may be in the free form or may be mixed with rumen contents in the form of froth. It occurs both on pasture and in feedlots and can be a major cause of death in cattle wherever intensive farming is practiced. Additional losses can include decreased milk production and reduced rate of gain. Although legumes may increase the opportunity for bloat to occur, fear of bloat should not keep …


Grazing Alfalfa: Is It Right For You?, Jimmy C. Henning Feb 2001

Grazing Alfalfa: Is It Right For You?, Jimmy C. Henning

Kentucky Alfalfa and Stored Forage Conference

Grazing alfalfa can be a very profitable and valuable practice for many Kentucky farmers. How do you know if this practice will work for you? First, you must be able to grow alfalfa. Second, you must address the concerns that are specific to grazing alfalfa.


Am-Pm Cutting Of Alfalfa, Garry D. Lacefield, Michael Collins, Jimmy C. Henning Feb 2001

Am-Pm Cutting Of Alfalfa, Garry D. Lacefield, Michael Collins, Jimmy C. Henning

Kentucky Alfalfa and Stored Forage Conference

Over the past twenty years of this Conference we have spent considerable time discussing "Alfalfa Harvest Management." We have discussed the importance of stage of maturity and its impact on quality on many occasions. We have presented research on many aspects of hay and haylage management. An overall theme for all the discussions has been "harvest for quality," with emphasis on saving the leaves during the entire harvesting process. Our recommendations have, are, and will continue to be centered around those management practices that will result in the greatest opportunity for preserving alfalfa quality from standing crop to feeding. This …


Crop Updates 2001 - Lupins, Mark Sweetingham, Beven J. Buirchell, Bob French, Laurie Wahlsten, Janet Wtoth, Kirsty Bayliss, Wallace Cowling, R. F. Brennan, Miles Dracup, Nick Galwey, Bob Thomsom, Moin Salam, Art Diggle, Geoff Thomas, Bill O'Neill, Debbie Thackray, Kevin Walden, M. Shankar, Dominie Wright, Nichole Burges, Hu'aan Yang, Ming Pei You, David Bowran, Abul Hashem, Nerys Wilkins, Aik Cheam, Terry Piper, Paul Blackwell, Miles Obst, Andrew Sandison, Cameron Weeks, Erin Hasson, Luigi Moreschi, Brett Glencross, Jon Clements, Miles Dracup, Ramon Hall, Stuart Johnson, Madeleine Ball, Sofia Sipsas, David Petterson Feb 2001

Crop Updates 2001 - Lupins, Mark Sweetingham, Beven J. Buirchell, Bob French, Laurie Wahlsten, Janet Wtoth, Kirsty Bayliss, Wallace Cowling, R. F. Brennan, Miles Dracup, Nick Galwey, Bob Thomsom, Moin Salam, Art Diggle, Geoff Thomas, Bill O'Neill, Debbie Thackray, Kevin Walden, M. Shankar, Dominie Wright, Nichole Burges, Hu'aan Yang, Ming Pei You, David Bowran, Abul Hashem, Nerys Wilkins, Aik Cheam, Terry Piper, Paul Blackwell, Miles Obst, Andrew Sandison, Cameron Weeks, Erin Hasson, Luigi Moreschi, Brett Glencross, Jon Clements, Miles Dracup, Ramon Hall, Stuart Johnson, Madeleine Ball, Sofia Sipsas, David Petterson

Crop Updates

This session covers twenty six papers from different authors:

INTRODUCTION,

1. Introduction, Dr Mark Sweetingham LUPIN RESEARCH AND INDUSTRY DEVELOPMENT, Agriculture Western Australia

VARIETIES

2. Lupin variety performance: Are you making the most of it? Bevan J. Buirchell, Agriculture Western Australia

3. Adaption of restricted-branching lupins in Western Australia, Bob French and Laurie Wahlsten, Agriculture Western Australia

4. Isolated microspore culture of lupin for production of doubled haploids, Dr Janet Wroth, Dr Kirsty Bayliss and A/Prof. Wallace Cowling, Plant Sciences, Faculty of Agriculture, The University of Western Australia

NUTRITION

5. Banding manganese fertiliser below the seed increases seed …


Crop Updates 2001 - Pulses, M. Harries, W. O'Neill, R. French, N. Brandon, N. Runciman, S. White, M. Seymour, P. White, T. White, C. Veitch, J. Berger, N. C. Turner, K. H. M. Siddique, H. Clarke, G. P. Riethmuller, W. Macleod, J. Millar, T. N. Khan, R. Beermier, N. Brown, H. Dhammu, T. Piper, D. Nicholson, M. D'Antuono, K. Regan, J. Clements, C. Francis, C. Hanbury, C. White, B. Mullan, B. Hughes, R. Bowie, J. Warburton, P. Fisher, M. Braimbridge, F. Hoyle, W. Bowden, S. Lawrence, Z. Rengel, S. P. Loss, M. D. A. Bolland, R. Brennan, P. Tille, N. Schoknecht, J. Galloway, D. Wright, N. Burges, R. Jones, L. Latham, O Edwards, J. Ridsdill-Smith, M. J. De Sousa Majer, N. C. Turner, D. Hardie, P. Smith, R. Emery, E. Kostas Feb 2001

Crop Updates 2001 - Pulses, M. Harries, W. O'Neill, R. French, N. Brandon, N. Runciman, S. White, M. Seymour, P. White, T. White, C. Veitch, J. Berger, N. C. Turner, K. H. M. Siddique, H. Clarke, G. P. Riethmuller, W. Macleod, J. Millar, T. N. Khan, R. Beermier, N. Brown, H. Dhammu, T. Piper, D. Nicholson, M. D'Antuono, K. Regan, J. Clements, C. Francis, C. Hanbury, C. White, B. Mullan, B. Hughes, R. Bowie, J. Warburton, P. Fisher, M. Braimbridge, F. Hoyle, W. Bowden, S. Lawrence, Z. Rengel, S. P. Loss, M. D. A. Bolland, R. Brennan, P. Tille, N. Schoknecht, J. Galloway, D. Wright, N. Burges, R. Jones, L. Latham, O Edwards, J. Ridsdill-Smith, M. J. De Sousa Majer, N. C. Turner, D. Hardie, P. Smith, R. Emery, E. Kostas

Crop Updates

This session covers sixty six papers from different authors:

1. Pulse Industry Highlights

2. CONTRIBUTORS

3. BACKGROUND

4. SUMMARY OF PREVIOUS RESULTS

2000 REGIONAL ROUNDUP

5. Northern agricultural Region, M. Harries, W. O’Neill, Agriculture Western Australia

6. Central Agricultural Region, R. French, Agriculture Western Australia

7. Great Southern and Lakes,N. Brandon, N. Runciman and S. White,Agriculture Western Australia

8. Esperance, M. Seymour, Agriculture Western Australia

PULSE PRODUCTION AGRONOMY AND GENETIC IMPROVEMENT

Faba bean:

9. germplasm evaluation,

10. Variety evaluation,

11. Sowing rate and time of sowing, Variation in root morphology, P. White and T. Pope, Agriculture Western …


A Strategic Marketing Analysis Of The Western Australian Olive Industry, Francis D'Emden Feb 2001

A Strategic Marketing Analysis Of The Western Australian Olive Industry, Francis D'Emden

Horticulture published reports

A recent survey of Western Australian olive growers has revealed the rapid expansion of the State's Olive Industry, with at least 1.7 million olive trees to be planted in the next two to four years in Western Australia. NSW and SA are currently the dominant producers with around 64% of olive trees planted in those States.

This analysis concentrates on the olive oil market, as most groves have been planted to varieties suited to olive oil production. Approximately 4% of trees are table varieties, most of which have been planted amongst groves of predominantly oil or dual-purpose varieties.

Western Australia …


Profitable Canola Production In The Northern Grainbelt Of Western Australia 2001, Paul Carmody, Adrian Cox Feb 2001

Profitable Canola Production In The Northern Grainbelt Of Western Australia 2001, Paul Carmody, Adrian Cox

Bulletins 4000 -

Canola is a member of the Brassicaceae family that also includes mustard, turnip, wild radish, cauliflower, cabbage and broccoli.

It is a winter growing oilseed that can be produced in most arable areas of Australia where winter crops are currently grown. Originally known as rapeseed using the varieties B. campestris, the varieties of B. napus have almost completely replaced this earlier variety in all the areas where the crop is grown.

The swing to B. napus varieties was due to their superior yields, resistance to blackleg and better quality oil and meal. Canola can be grown on a wide variety …


Nebline, February 2001 Feb 2001

Nebline, February 2001

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

We’re Here When You May Need Us Most! http://lancaster.unl.edu
It's a Hit!
“But I don’t have a computer”
What Does the Future Hold for This Web Site?
Pruning Mature Deciduous Shrubs
2001 All America Selection
Basil for Your Garden
We need your help!
Beginning Beekeeping Classes: Kearney and Omaha
Editors Comment
Prevent Rabbit Damage to Trees and Shrubs
Computerized Financial Recordkeeping
What is Organic? Now We Know
New EPA Regulations
Display Tips for Farmers Markets
Egg Eating by Chickens
Lawn Care Management Focus of March UNL Workshop
It’s Garden Seed Catalog Time
Top Ten List
Healthy Eating
Helping of Holiday …


Avocado Culture In Western Australia, Alec Mccarthy Feb 2001

Avocado Culture In Western Australia, Alec Mccarthy

Bulletins 4000 -

The avocado is a large evergreen tree of sub-tropical origin. The fruit are high in protein, fats (mono and polyunsaturated), several minerals and vitamins. The Guinness Book of Records lists the avocado as the most nutritious fruit in the world. It is suitable for infants through to the elderly and does not contain any cholesterol.

Avocado trees are quite adaptable, being grown from Kununurra in the north down to Albany in the south. They are being grown commercially in the south-west from Perth down to Pemberton and in Carnarvon. Avocado trees are frost susceptible, particularly when young, so they are …


Predicting Forage Quality In Switchgrass And Big Bluestem, Rob Mitchell, John Fritz, Ken Moore, Lowell E. Moser, Ken Vogel, Daren D. Redfearn, David Wester Feb 2001

Predicting Forage Quality In Switchgrass And Big Bluestem, Rob Mitchell, John Fritz, Ken Moore, Lowell E. Moser, Ken Vogel, Daren D. Redfearn, David Wester

Department of Agronomy and Horticulture: Faculty Publications

Predicting forage quality would help producers scheduled hay harvesting to obtain desired hay quality. Our objective was to determine if growing degree day (GDD), day of the year (DOY), mean stage count (MSC), and mean stage weight (MSW) could be used to predict in vitro digestible dry matter (IVDDM), crude protein (CP), and neutral-detergent fiber (NDF) of ‘Trailblazer’ switchgrass (Panicum virgatum.) and ‘Pawnee’ big bluestem (Andropogon gerardii Vitman) grown in Nebraska and Kansas. This field study was conducted from 1990 to 1993 at Mead, NE on Typic Argiudoll soils and from 1992 to 1993 at Manhattan, KS …


Evaluation Of Gel Filtration Resins For The Removal Of Pcr-Inhibitory Substances From Soils And Sediments, Daniel N. Miller Jan 2001

Evaluation Of Gel Filtration Resins For The Removal Of Pcr-Inhibitory Substances From Soils And Sediments, Daniel N. Miller

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

A variety of gel filtration resins (Sephadex G200 and G150; Sepharose 6B, 4B and 2B; Bio-Gel P100, P200; and Toyopearl HW 55, HW 65, and HW 75) were evaluated for their efficacy in removing PCR-inhibitory substances from feedlot soil DNA crude extracts using gravity-flow disposable columns. Sepharose resins demonstrated the best properties for DNA purification when compared to other gel filtration resins, and Sepharose 2B was the most efficient purification resin based upon flow rate and the elution of DNA and humic acids from the columns. A method for purifying large solution volumes of DNA extract economically was also developed …


Instructions For Authors, Discovery Editors Jan 2001

Instructions For Authors, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.


Letter From The Dean, Gregory J. Weidemann Jan 2001

Letter From The Dean, Gregory J. Weidemann

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.


Contents, Discovery Editors Jan 2001

Contents, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.


Abrogation Of Disease Development In Plants Expressing Animal Antiapoptotic Genes, M. B. Dickman, Y. K. Park, T. Oltersdorf, W. Li, T. Clemente, Roy C. French Jan 2001

Abrogation Of Disease Development In Plants Expressing Animal Antiapoptotic Genes, M. B. Dickman, Y. K. Park, T. Oltersdorf, W. Li, T. Clemente, Roy C. French

Department of Plant Pathology: Faculty Publications

An emerging topic in plant biology is whether plants display analogous elements of mammalian programmed cell death during development and defense against pathogen attack. In many plant– pathogen interactions, plant cell death occurs in both susceptible and resistant host responses. For example, specific recognition responses in plants trigger formation of the hypersensitive response and activation of host defense mechanisms, resulting in restriction of pathogen growth and disease development. Several studies indicate that cell death during hypersensitive response involves activation of a plant-encoded pathway for cell death. Many susceptible interactions also result in host cell death, although it is not clear …


Three Distinct Mechanisms Facilitate Genetic Isolation Of Sympatric Wheat Streak Mosaic Virus Lineages, Jeffrey Hall, Roy C. French, Gary L. Hein, Thomas Jack Morris, Drake Stenger Jan 2001

Three Distinct Mechanisms Facilitate Genetic Isolation Of Sympatric Wheat Streak Mosaic Virus Lineages, Jeffrey Hall, Roy C. French, Gary L. Hein, Thomas Jack Morris, Drake Stenger

Department of Plant Pathology: Faculty Publications

Cross-protection and vector transmission bottlenecks have been proposed as mechanisms facilitating genetic isolation of sympatric viral lineages. Molecular markers were used to monitor establishment and resolution of mixed infections with genetically defined strains of wheat streak mosaic virus (WSMV). Two closely related WSMV strains from the U.S. (Type and Sidney 81) exhibited reciprocal cross-protection in wheat, confirming this classic phenomenon as a mechanism of genetic isolation. In contrast, cross-protection between either U.S. strain and the divergent El Batan 3 strain from Mexico was unilateral, erratic, and only partially effective. Distribution of WSMV strains within individual leaves of plants supporting a …