|HUTMACHER, ROBERT - University Of California|
|FRIGULTI, TERILEE - University Of California|
|ELLIS, MARGARET - California State University|
|ROBERTS, PHILLP - University Of California|
|NICHOLS, ROBERT - Cotton, Inc|
Submitted to: ASA-CSSA-SSSA Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 8/30/2019
Publication Date: 11/11/2019
Citation: Ulloa, M., Hutmacher, R.B., Frigulti, T., Ellis, M.L., Roberts, P.A., Nichols, R.L. 2019. The hunt for sources of and introgressed resistance genes of Fusarium wilt race 4 (FOV4) in Cotton. ASA-CSSA-SSSA Proceedings. p.62-2.
Technical Abstract: The need for Pima (Gossypium barbadense L) and Upland (G. hirsutum L.) cotton cultivars resistant/tolerant to Fusarium wilt (Fusarium oxysporum spp. vasinfectum) race 4 (FOV4), a soil-borne fungal pathogen, has become urgent. Over a decade, FOV4 has impacted cotton production in California’s San Joaquin Valley, but recently it has been identified in Texas fields, in proximity to the largest Upland cotton producing region in the U.S. So far, only host-plant resistance is effective to manage FOV4 damage. Our ongoing research identified resistance to FOV4 in Pima cotton originated-pool germplasm, ‘Pima S-6’ and publicly released Pima germplasm with improved FOV4 resistance. Today, we continue to identify/develop new introgressed-progeny from international sources such as Egyptian, Uzbekistani, and Peruvian lines. The search for resistant Upland cotton has been difficult and different compared to Pima. Through mining the USDA-ARS, Cotton Germplasm Collection, more than 1000 accessions selected from different breeding programs or companies have been evaluated for FOV4 infection response-tolerance. Less than 0.1% were selected and used to develop highly tolerant FOV4 progeny. Two independent sources, one from NMSU and the other from the collection of Asiatic source origin were identified with tolerance and used to introgress and increase FOV4 tolerance. Pedigree information from these breeding stocks revealed exotic/wild Upland germplasm and triple/multiple crosses derived obsolete cultivars such as ‘Aubun M’, ‘DES 920’, ‘MARSPD202085’, ‘S.N.0503-1’, ‘Stoneville’ 14, etc. Highly tolerant Upland breeding lines will be publicly released from this effort to reduce the vulnerability of the cotton industry to this pathogen.