Development of southernpea cultivars with bacterial blight and root-knot nematode resistance will provide growers with economical control of these problems. LA 96-74 and LA 96-4 will provide growers additional new high-yielding bush pinkeye and cream southernpea cultivars for fresh-market. Demand for the cultivar remains strong with approximately 100,000 lbs of seed sold annually. Quickpick Pinkeye, developed by the Louisiana Agricultural Experiment Station for fresh-market, is widely grown throughout the southern U.S. The lines were used as parents in a study to determine the genetic control of tolerance to magnesium deficiency. Four pinkeye lines (LA 96-25, LA 96-74, LA 2-52, and Quickpick Pinkeye) produced satisfactory yields in magnesium deficient soils. The dominant Rk gene for resistance to root-knot nematode was incorporated into pinkeye, cream, and crowder bush-type breeding lines. Root-knot nematode can result in serious yield loss in southernpea. Advanced breeding lines with resistance to bacterial blight are now being evaluated for yield potential in replicated trials. Some of these resistant PI lines were used as parental lines to incorporate resistance into breeding lines. Nearly one-third of the lines exhibited a hypersensitive resistant response to the pathogen. Tests conducted in a greenhouse screened 640 Plant Introduction lines included in the core collection of the USDA cowpea germplasm collection for reaction to bacterial blight. Currently, there are no commercial southernpea cultivars resistant to the disease. vignicola is a major disease of southernpea. Bacterial blight, incited by Xanothomonas axonopodas pv. Crowder breeding lines selected from these crosses for bush plant-type are being evaluated for yield and other desirable traits. Crosses were made between vining crowder southernpea cultivars and bush pinkeye and cream breeding lines in an effort to develop bush crowder cultivars. Yield of LA 96-4 is comparable to hand or machine harvested yield of cream bush plant-type cultivar Early Acre. Hand and machine harvested yield of LA 96-74 is comparable to yield of pinkeye bush plant-type cultivars Quickpick Pinkeye, Texas Pinkeye Purple Hull, and Top Pick Pinkeye. Both are intended for fresh-market use and have a bush plant-type suitable for hand or machine harvest. Impacts Pinkeye purple hull breeding line LA 96-74 and cream breeding line LA 96-4 are proposed for release as cultivars. PROJECT MODIFICATIONS: Not relevant to this project. TARGET AUDIENCES: Not relevant to this project. Blair Buckley, Principal Investigator Mr. Information was shared with southernpea growers at station field days and through on-farm and on-station visits. Information on the breeding lines and breeding project was conveyed to southernpea researchers and industry representatives at annual meetings of the National Cowpea Improvement Association and in the published Composite Report of the Regional Southernpea Cooperative Trial. Progress 07/01/03 to 06/30/08 Outputs OUTPUTS: Improved pinkeye and cream southernpeas with bush plant-type were developed through the project.
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