Soybean Pest Unmasked

Word of warning to one species of soybean cyst nematode: Be very afraid. Researchers are on to you now, and it’s only a matter of time.

One species of cyst nematode, Heterodera glycines, feeds on soybean crops, resulting in up to $1 billion in crop loss in the U.S. each year. Recent research, funded by USDA’s Cooperative State Research, Education, and Extension Service (CSREES), is uncovering the mechanisms used by this nematode to weaken the plant’s defense system.

Recent work by scientists at the University of Missouri (UM) and Iowa State University (ISU) is featured on the cover of the March issue of the journal Molecular Plant-Microbe Interactions. The results from their studies may lead to more effective management tools to combat the agricultural pest and protect this vital U.S. crop.

Nematodes have developed a highly evolved relationship with the host plant. During the juvenile stage, cyst nematodes penetrate the roots of the soybean plant and travel to the vascular tissue. Here the juvenile nematode stops to feed. During the feeding process, the nematode injects secretions that modify the root cells, creating specialized feeding cells, called syncytia, which provide nutrients to the nematode necessary for growth and development, as well as maintain the host-parasite relationship. In essence, the plant cell is reprogrammed by these secretions to support the feeding nematode rather than support and benefit the plant. Without a functioning syncytium, the nematode will die.

Lead scientist Melissa Mitchum and colleagues at UM and ISU examined the molecular mechanisms that lead to the development of the syncytia cells. The scientists examined 35,611 soybean genes and obtained the first comprehensive gene expression profile of the developing syncytium during very early stages of the plant-nematode interaction. Their work shows that within two days after syncytium formation over 1,765 soybean genes changed expression.

This team found that genes for proteins involved in plant cell wall formation are compromised by interplay between plant hormones, called phytohormones. In addition, a decrease in the production of jasmonic acid may suppress the plant defense response, which allows the nematode to survive and thrive.

The results from this study provide the most comprehensive picture of gene expression changes within developing syncytia to date. These findings may provide scientists the key to decipher which genes play essential roles in the induction, formation, and function of the syncytium for the survival and growth of cyst nematodes. Future work in this area may lead to new management techniques through the use of biotechnology to better control these important agricultural pests. Current nematode management strategies focus on reduction and control of pest population levels below the damage thresholds. Field eradication of this pest is rarely a feasible option. Crop rotation using non-host crops such as corn or planting nematode resistant soybean varieties are the most efficient management strategies to date. Chemicals, like nematicides, are available, but rarely have the necessary long-term effect on nematode populations and are not cost-effective for the grower.

Cyst nematode-induced damage is difficult to diagnose, because the symptoms are nondescript and often contribute to other factors, such as compaction, nutrient deficiencies, drought stress, herbicide injury, or other plant diseases.

(Source: USDA)
 

Leave a Reply

Insecticides Stories

InsecticidesHow To Scout For Corn Earworms In Corn
July 28, 2014
In her weekly report, University of Missouri Agronomy Specialist Jill Scheidt discusses what to look for when scouting for corn earworm. Read More
InsecticidesEPA Grants Besiege Insecticide Additional Approvals
June 18, 2014
EPA has granted additional registration approvals for the use of Syngenta's Besiege insecticide on sorghum, cereal grains and peanuts. Read More
InsecticidesPrevathon Insect Control Approved For Cereal Crops
January 13, 2014
DuPont's Prevathon insect control powered by Rynaxypyr has received U.S. EPA registration for use on cereal crops, including wheat, most other small grains and sorghum. Read More
InsecticidesInsecticides 2014: Insect Pressure, Solutions On The Rise
January 2, 2014
Bt resistance, weather concerns and myriad other issues have led to an increase in both traditional pest pressures as well as new pests. Read More

Trending Articles

HerbicidesAdjusting To The New Reality Of Weed Control
November 4, 2014
Even with new cropping systems being readied for market introductions, weed control will remain a challenge for many. Read More
StewardshipResponsibleAg Begins Auditor Training
October 31, 2014
ResponsibleAg auditor training is now underway at the Ford B. West Center for Responsible Agriculture in Owensboro, KY. Read More
InsecticidesNew Research Study Shows The Value Of Neonics
October 29, 2014
The study evaluated seed treatment, soil and foliar uses of neonicotinoid insecticides in the U.S. and Canada. Read More
Crop InputsPlatform Specialty Products To Acquire Arysta LifeScience
October 20, 2014
Once the acquisition is complete, Platform Specialty Products will combine Arysta LifeScience with previously acquired companies Agriphar and Chemtura Crop Solutions. Read More
Seed/BiotechMonsanto Offers New Support For Ferguson, Area Communities
October 8, 2014
Monsanto Co. has committed $1 million in new support for several collaborative efforts in Ferguson, MO, and surrounding communities in North St. Louis County. Read More
Seed/BiotechUnapproved Genetically Modified Wheat Found In Montana
October 3, 2014
USDA reports that one year after discovery of Monsanto's unapproved wheat in a single Oregon field disrupted U.S. wheat export sales, the GMO wheat has again been found in Montana. Read More

Latest News

soybean field
Crop InputsABM Patents Microbial R&D Technique
November 25, 2014
Focused Microbial Diversity (FMD) is a newly patented technique employed by Advanced Biological Marketing (ABM) to research and develop microbials that will be used in ABM products Read More
Crop InputsStorage Options Help Grain Growers Go To Market
November 24, 2014
While on-farm storage in a traditional upright storage bin is one possibility for storing grain, it may not be for everyone. Read More
Eric SfiligojGiving Thanks For Another Great Year
November 24, 2014
As Thanksgiving Day 2014 arrives, agriculture has plenty to be thankful for. Read More
Crop InputsSyngenta Cost-Cutting Program To Affect 1,800 Jobs
November 24, 2014
The company's Accelerating Operational Leverage program will result in job reductions and relocations totaling around 1,800 across the company, the majority of which will occur in 2015. Read More
EquipmentAGCO Announces Operator Of The Year Finalists
November 20, 2014
Four custom applicators have been selected by AGCO Application Equipment as finalists for 2014 Operator of the Year, an honor that recognizes them as being among the top professionals in their industry throughout North America. Read More
MicronutrientsH.J. Baker Expands Tiger-Sul Business
November 20, 2014
H.J. Baker has created and filled two strategic positions in business development and sales within its Crop Performance Division. Read More
soybean field
FertilizerGeneral Mills Honors United Suppliers For Nitrogen Opti…
November 19, 2014
United Suppliers winning proposal detailed SUSTAIN, a consulting network that provides customized products and services for farmers using a needs-based system approach. Read More
EmployeesOhio AgriBusiness Association Awards $25,000 In Scholar…
November 19, 2014
Each year, the Ohio AgriBusiness Association Educational Trust scholarship program awards scholarship dollars to students enrolled in an agriculture-related field attending several state colleges. Read More
ManagementServi-Tech Names New CEO
November 17, 2014
Servi-Tech has named Greg Ruehle its new president and CEO. Read More
CropLife 100Pinnacle Ag Acquires Colorado Aerial Application Outlet
November 17, 2014
Ft. Lupton, CO-based Reck Aviation — a full-service chemical application company providing aerial crop applications of fertilizers and crop protection products — will operate as part of Pinnacle's AgOne Application Services brand. Read More
Eric SfiligojMcDonald’s Message: Biotech Crops Scarier Than Cancer
November 17, 2014
Despite their potential health benefits, one of the world’s largest potato users will pass on a new biotech offering. Read More
MicronutrientsWinField Releases 2014 NutriSolutions Results
November 14, 2014
A number of significant regional and national crop deficiency trends emerged from the 2014 WinField NutriSolutions tissue sampling program. Read More
FertilizerH.J. Baker Opens Chinese Production Lines
November 14, 2014
The occasion was the official launch of the Tiger-Sul sulphur Bentonite production line of two much anticipated fertilizer products in China, T90CR sulphur fertilizer and TZinc micronutrient enhanced sulphur fertilizer. Read More
ManagementOhio Certified Crop Adviser Program Accepting Nominatio…
November 14, 2014
The award recognizes an individual who delivers exceptional customer service for farmer clients in nutrient management, soil and water management, integrated pest management and crop production in Ohio. Read More
HerbicidesSyngenta Announces Acuron Trial Plot Results
November 14, 2014
Acuron was tested at 167 trial locations across 35 states. Trials included 95 Syngenta locations, 54 university locations and 18 distributor locations. Read More
Crop InputsVerdesian Expands Sales Force
November 13, 2014
The new sales representatives will work with growers, retail partners and distributors to oversee technical training and product education. Read More
EquipmentAGCO Raises $100K For Wounded Warrior Project
November 13, 2014
AGCO Corp. partnered with local AGCO dealers across the U.S. and Canada to raise nearly $100,000 in support of wounded service veterans. Read More
HerbicidesDow AgroSciences Announces Launch Of Enlist Duo Herbici…
November 12, 2014
It will be launched in conjunction with a stewarded introduction of Enlist corn, and seed production of Enlist soybeans in 2015. Read More