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Title:   Author  item
                                            Ulloa, Mauricioitem
                                            HUTMACHER, ROBERT - University Of Californiaitem
                                            WRIGHT, STEVE - University Of Californiaitem
                                            Campbell, Benjamin

                                                         - *Todd*item
                                            WALLACE, TED - Mississippi State Universityitem
                                            MYERS, GERALD - Louisiana State Universityitem
                                            BOURLAND, FRED - University Of Arkansasitem
                                            WEAVER, DAVID - Auburn Universityitem
                                            CHEE, PENG - University Of Georgiaitem
                                            LUBBERS, ED - University Of Georgiaitem
                                            THAXTON, PEGGY - Delta Research & Extension Centeritem
                                            ZHANG, JINFA - New Mexico State Universityitem
                                            SMITH, WAYNE - Texas A&M Universityitem
                                            JONES, DON - Cotton, Inc
  Submitted to: National Cotton Council Beltwide Cotton Conference
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 1/7/2010
                                    Publication  Date: 4/29/2010
                                    Citation: Ulloa, M., Hutmacher, R.B., Wright, S.D., Campbell, B.T., Wallace, T., Myers, G., Bourland, F., Weaver, D., Chee, P., Lubbers, E., Thaxton, P., Zhang, J., Smith, W., Jones, D. 2010. Beltwide breeders' elite-Upland germplasm-pool assessment of Fusarium wilt (FOV) races 1 & 4 in California. National Cotton Council, Memphis, TN. p. 765-766.Interpretive Summary:
                                Technical Abstract: Host-plant resistance is currently the most economic and effective strategy for managing Fusarium wilt [Fusarium oxysporum f. sp. vasinfectum (FOV)] in the San Joaquin Valley (SJV) of California. Recently, a strain of Fusarium (race 4) was identified in the SJV that damages most cultivars of Pima cotton and many Upland cultivars. To assess the vulnerability of Upland cotton production in California to this disease, elite germplasm consisting of 42 entries from ten public breeding programs was evaluated for response to FOV. Evaluations were done at two race 4 infested field sites (Fresno and Kern Co.), and one race 1 site [co-infested with root-knot nematode (RKN)] (Shafter) using a RCBD with three blocks. Five plants of each entry per block were scored for vascular root staining (VRS, scale 0=no visible staining to 5=plant death) and percentage survival (PS). Both measures of infection were significantly correlated between the two race 4 sites (r=0.58 and r=0.37, respectively), indicating overall similarity in the responses of evaluated lines at both sites. Neither measure of infection was correlated between the race 1 site and either race 4 site (P>0.05). Averages for VRS and PS, respectively, were 2.10 and 55 % (Fresno Co.); 2.0 and 61% (Kern Co.); and 1.3 and 84% (Shafter). The VRS and PS for checks susceptible to FOV race 4 were 4.4 and 5 % for Fresno Co., and 3.0 and 6 % for Kern Co. (Pima S-7), and 2.6 and 60% for Fresno Co., and 2.1 and 26 % for Kern Co. (Acala/Upland Phytogen 72). Additional analyses revealed interactions in disease response among germplasm lines, FOV races (1 and 4), and evaluation sites. Selected lines from AL, AR, and MS appeared tolerant to both FOV races. Our findings reveal the need for evaluation and breeding for multiple types of disease resistance, which is essential to continued growth and competitiveness of the cotton industry.


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