Using molecular biology to look for disease resistance in soybean

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

Cercospora leaf blight is the No. 1 fungal disease in Louisiana’s No. 1 row crop – soybeans.

The emerging disease, which has appeared only in the past five to 10 years, has no resistance in any soybean lines, according to LSU AgCenter plant pathologist Zhi-Yuan Chen.

The Cercospora fungus survives in infected seeds and plant residue, and spores form on the residue surface during warm, humid weather, experts say. The spores are wind-blown or rain-splashed to new soybean tissue where infection occurs. Seeds also can carry the fungus.

The foliar disease can remain latent in growing soybean plants for several weeks before they show symptoms. In severe cases the disease can cause defoliation, and it is associated with the green stem disorder.

In an attempt to solve the lack of resistant plants, Chen has been using molecular tools to find ways to make soybeans resistant to the disease.

“There are no known resistant lines that we can use to learn how soybeans defend themselves against Cercospora kikiuchii infection using the available molecular tools,” Chen said.

Instead, Chen’s research team in the Department of Plant Pathology and Crop Physiology has been focusing on identifying genes that produce cercosporin, a toxin that can suppress a plant’s defense mechanism.

So far, he has identified two genes using proteomics – the branch of molecular biology that studies the full set of proteins encoded by a genome – and gene disruption studies. These genes appear to be important for cercosporin production by the pathogen.

The genes are currently being tested for their ability to suppress the toxin and the resulting fungal infections. If they actually do what the researchers believe, these genes will be introduced into new soybean lines to produce resistant varieties.

Chen’s laboratory team also has identified several genes that potentially can play an important role in soybean resistance to rust infection. They currently are testing these genes using a virus-induced gene silencing approach.

“Preliminary data show that soybeans with reduced expression of these genes are more susceptible to rust infection, indicating that enhancing the expression of these genes in the future could provide better protection against soybean rust diseases,” Chen said.


Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...


Comments (0) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left


Speed King Honeycomb BeltVeyors

CrustBuster/SPEED KING Inc. has a full line up of Honeycomb style BeltVeyors that offer high capacity, greater discharge height with ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form