|11-101 Project Manager: D. C. Jones|
VALIDATION OF YIELD, AGRONOMIC, FIBER QUALITY, AND DISEASE RESISTANCE TRAITS ON IMPROVED COTTON GERMPLASM AND BREEDING LINES.
Robert B. Hutmacher, University of California, Davis
Primary functions of the trials are: (1) to provide a California location for yield and fiber quality testing of Upland cultivars from breeding programs across the U.S. in a San Joaquin Valley as part of nation-wide evaluations; and (2) test these same entries in field sites known to have significant inoculum pressure for race 4 Fusarium oxysporum vas infectum (FOV-race4). In 2012 the yield and fiber quality trial consisted of a site planted in April at the University of California West Side Research and Extension Center in western Fresno County. Harvest was done using a spindle picker in November. The Fusarium race 4 resistance screening trials were conducted in multiple sites (one in Tulare county, one in Kern County) in grower fields known to be infested heavily with inoculum of this race of Fusarium. These trials were small plot in 4 replications with plots 1 row in width by about 65 to 70 feet in length. The goals of the project were to provide evaluations in a trial site with typical good yield potential for testing a large number of entries of potential interest to seed companies and growers. Entries are from multiple areas in the U.S. with entries grown to assess relative performance in San Joaquin Valley production conditions.
Summaries of yield data (seed cotton yields only at this point) are available. Boll samples were collected as in prior years to send to Cotton Incorporated for evaluation of lint percentage and for fiber quality as any protocols dictate. All of these entries were harvested November 1 by spindle picker machine. HVI data is available on samples sent through the Cotton Incorporated facility from all trial locations.
The two screening locations differed some in the intensity of the plant responses, although both were highly infested with inoculum from pathology evaluations and pre-planting evaluations of impacts of susceptible varieties. The impacts on plant mortality were more severe at the Tulare County site than at the Kern County site. Similarly, data on plant vigor showed a greater range of impact of the disease on the more susceptible varieties at the Tulare county site than at the Kern County site.
Data from the yield trial will be submitted to the coordinator of the RBTN trials along with fiber quality data. The summary information on whole plot foliar injury ratings, foliar leaf damage index rating, root vascular stain index rating, main stem node count, plant height, and plant survival percentage (at 7-8 weeks) will also be made available to all cooperators in the RBTN trials when the data sets are complete and ready to send. It is expected that the yield and fiber quality data set will be ready to send in early February, with the summary information from the Fusarium race 4 screening following within a few weeks after the yield data.
|Project Year: 2012|
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