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Soybean varieties viable in southern Indiana, resistant to root-knot nematode
Date:3/20/2008

o spot on the root because it stays on the outside. These pinhead-sized nematodes are white, then yellow, and finally become brown as they mature. The nematode-induced cysts are much smaller than the so-called "nodules," which are structures induced by the beneficial bacterium rhizobium. Rhizobium association aids the plant in nutritional nitrogen absorption.

The root-knot nematode induces big clumps, or galls, on the root that look a bit like a wart or a tree knot, and the deformations are much bigger than the signs caused by the soybean cyst nematode. The nematode galls have irregular tumorlike shapes, in contrast to the spherical shape of nodules caused by rhizobium association.

Next the researchers will try to determine varieties of cover crops that are nematode-resistant. Cover crops are used over the winter to control erosion but can provide a habitat for the parasites. This means that larger populations of the parasites are present when crops are planted in the spring.

"We hope that we can improve nematode suppression in the entire crop sequence to improve the yield of the cash crops," Westphal said.


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Contact: Susan A. Steeves
ssteeves@purdue.edu
765-496-7481
Purdue University
Source:Eurekalert  

Page: 1 2 3

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Soybean varieties viable in southern Indiana, resistant to root-knot nematode
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