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Title: Registration of Four Pima Cotton Germplasm Lines Having Good Levels of Fusarium wilt race 4 resistance with Moderate Yields and Good Fibers.

Author
item Ulloa, Mauricio
item Percy, Richard
item ZHANG, JINFA - NEW MEXICO STATE UNIV
item HUTMACHER, ROBERT - UC-DAVIS, SHAFTER, CA
item WRIGHT, STEVE - UC-DAVIS, TULARE, CA
item DAVIS, MIKE - UC-DAIVS, DAVIS, CA

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/9/2008
Publication Date: 5/1/2009
Citation: Ulloa, M., Percy, R., Zhang, J., Hutmacher, R.B., Wright, S.D., Davis, R.M. 2009. Registration of four Pima cotton germplasm lines having good levels of Fusarium wilt race 4 resistance with moderate yields and good fibers. Journal of Plant Registrations. 3:198-202.

Interpretive Summary: Race 4 of the fungus causing Fusarium wilt disease in cotton is a relatively recent invader of California. This strain of Fusarium has proven especially damaging to most varieties of Pima cotton. Thus, cotton breeders need alternative sources of germplasm for improving resistance of Pima cottons to this disease. For this purpose, the Agricultural Research Service, United States Department of Agriculture, New Mexico State University Agricultural Experiment Station, and University of California released four Pima cotton germplasm lines (SJ-07P-FR01, SJ-07P-FR02, SJ-07P-FR03, and SJ-07P-FR04). Based on the results of field and greenhouse studies, these lines possess good, but not complete, levels of resistance to Fusarium wilt race 4. These lines also produced moderate yields of cotton lint with good to superior length and strength. The SJ-07P-FR lines provide needed alternative sources of Fusarium wilt resistance, and broaden the genetic base of resistant germplasm critical to maintaining a healthy Pima cotton industry in the San Joaquin Valley of California.

Technical Abstract: Four Pima (Gossypium barbadense L.) cotton germplasm lines, SJ-07P-FR01 (PI 654065), SJ-07P-FR02 (PI 654066), SJ-07P-FR03 (PI 654067), and SJ-07P-FR04 (PI 654068), were developed by the Agricultural Research Service, United States Department of Agriculture, and New Mexico State University Agricultural Experiment Station, and jointly released with the University of California in 2008. The primary purpose for these releases was to provide germplasm with good levels of resistance to Fusarium wilt [Fusarium oxysporum f. sp. vasinfectum (FOV) Atk. Sny & Hans] race 4 to cotton breeders in California. These lines provide needed alternative sources of FOV resistance and broaden the genetic base of resistant germplasm critical to maintaining a healthy Pima cotton industry in the San Joaquin Valley of California. Lines SJ-07P-FR01–FR03 originated from a cross made at New Mexico State University in 1997 of germplasm lines 8810 and NMSI 1601, followed by individual plant selection in the F2 - F3 generations of the hybrid population. A final generation of individual plant selection was conducted at Shafter, CA, followed by advancement in subsequent generations as individual progeny lines. SJ-07P-FR04 is a germplasm line originating from re-selection within the publicly released USDA-ARS germplasm line P 73. The lines were evaluated for resistance to race 4 in two field trials conducted in 2003 and 2004 and in three greenhouse trials conducted in 2004 and 2005. Five replicated field evaluations for yield potential, fiber characteristics, and other agronomic traits were conducted at Westside, CA, and Shafter, CA, and Maricopa, AZ, in 2005 and 2006. The SJ-07P-FR-series possesses moderate lint yield potential, and good to superior fiber length and strength. Caution should be applied when utilizing these lines and it should not be assumed that the lines provide complete resistance against FOV race 4.