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1320 Development of Reniform Nematode Resistance in Upland Cotton

Dr. A. Forest Robinson , USDA - Agricultural Research Service, Southern Plains Agricultural research Center, College Station, TX Dr. P. Agudelo , Clemson Univ., Clemson, SC Mr. C. A. Avila , Univ. of Arkansas, Fayetteville, AR Dr. A. A. Bell , USDA-ARS, College Station, TX Dr. F. E. Callahan , USDA-ARS, Mississippi State, MS Dr. C. G. Cook , All-Tex Seed/Leveland Delinting, Inc., Victoria, TX Dr. N. D. Dighe , Dep. Soil and Crop Sciences, College Station, TX Dr. O. A. Gutierrez , Dep. of Plant and Soil Sciences, Mississippi State, MS Dr. R. W. Hayes , USDA-ARS, Mississippi State, MS Dr. J. N. Jenkins , USDA-ARS, Mississippi State, MS Dr. J. T. Johnson , Bayer CropScience, Leland, MS Dr. R. Kantety , Fac. Forestry, Normal, AL Dr. G. W. Lawrence , Dep. Entomology and Plant Pathology, Mississippi State, MS Dr. K. S. Lawrence , Dep. Entomology and Plant Pathology, Auburn, AL Ms. L. Mangineni , Dep. Agronomy and Soils, Auburn, AL Dr. J. C. McCarty , USDA-ARS, Mississippi State, MS Dr. M. A. Menz , Dep. Soil and Crop Sciences, College Station, TX Dr. W. A. Meredith Jr. , USDA-ARS, Stoneville, MS Dr. R. N. Nichols , Cotton Incorporated, Cary, NC Dr. R. T. Robbins , Dep. of Plant Pathology, Fayetteville, AR Dr. E. Sacks , USDA-ARS, Stoneville, MS Dr. B. Scheffler , USDA-ARS, Stoneville, MS Dr. G. L. Sciumbato , Dep. Entomology and Plant Pathology, Stoneville, MS Dr. C. W. Smith , Dep. Soil and Crop Sciences, College Station, TX Dr. J. L. Starr , Dep. Plant Pathology and Microbiology, College Station, TX Dr. D. M. Stelly , Dep. Soil and Crop Sciences, College Station, TX Dr. S. R. Stetina , USDA-ARS, Stoneville, MS Dr. J. McD. Stewart , Univ. of Arkansas, Fayetteville, AR Dr. P. M. Thaxton , Dep. Plant and Soil Sciences, Mississippi State, MS Dr. T. P. Wallace , Dep. Plant and Soil Sciences, MIssissippi State, MS Dr. D. B. Weaver , Dep. Agronomy and Soils, Auburn, AL Dr. M. J. Wubben , USDA-ARS, Mississippi State, MS Dr. L. D. Young , USDA-ARS, Stoneville, MS

The purpose of this review is to assess development of resistance to the reniform nematode (Rotylenchulus reniformis) in upland cotton (Gossypium hirsutum). Cotton cultivars with reniform nematode resistance are needed. The development of resistant cultivars appears possible but presents a significant research challenge, primarily for two reasons. First, the best sources of resistance occur within diploid species that are genetically incompatible with cotton. Second, without molecular markers, reniform nematode resistance can be detected only by lengthy nematode reproduction assays. Thus, it is absolutely essential to discover a molecular marker for each resistance gene to provide seed companies with a tool for monitoring inheritance of resistance as they proceed through the cultivar development process. Simultaneous introgression of resistance from sources within several species is the wisest approach, because incomplete expression or incorporation of closely linked deleterious genes is possible in all cases, and in each case an investment of many years is required before success can be gauged by field testing of elite resistant breeding lines at multiple sites. Currently, researchers at more than a dozen USDA laboratories and state

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