|ABDURAKHMONOV, IBROKHIM - Uzbekistan Academy Of Sciences|
|HUTMACHER, ROBERT - University Of California, Davis|
|SCHRAMM, TARILEE - University Of California, Davis|
|SHERMATOV, SHUKHRAT - Uzbekistan Academy Of Sciences|
|BURIEV, ZABARDAST - Uzbekistan Academy Of Sciences|
|ROBERTS, PHILIPA - University Of California|
|ELLIS, MARGARET - California State University|
Submitted to: Journal of Plant Registrations
Publication Type: Germplasm Registration
Publication Acceptance Date: 3/28/2022
Publication Date: 6/2/2022
Citation: Ulloa, M., Abdurakhmonov, I., Hutmacher, R.B., Schramm, T., Shermatov, S., Buriev, Z., Roberts, P., Ellis, M.L., Payton, P.R. 2022. Registration of three gossypium barbadense l. American pima-like germplasm lines (pssj-frp01 – pssj-frp03) with improved resistance to fusarium wilt race 4 and good fiber quality. Journal of Plant Registrations. 1-9. https://doi.org/10.1002/plr2.20230.
Interpretive Summary: Over the past 18 years, the soil borne fungus Fusarium wilt race 4 (FOV4) has significantly impacted Pima cotton production in the San Joaquin Valley of California and essentially destroying Upland cotton production in this region. Recently this pathogen has been identified in southeastern New Mexico and southwestern Texas, posing a threat to cotton production in these regions and the entirety of production in Texas. As part of our efforts to develop varieties with FOV4 resistance, ARS scientists and university cooperators released three Pima germplasm lines (PSSJ-FRP01 – PSSJ-FRP03) with improved resistance to FOV4 and good fiber quality. PSSJ-FRP01-P03 line-series originated from crosses with cotton parental-lines known to possess high to moderate levels of FOV4 resistance and an Uzbekistani cotton type with different plant structure, large leaves, columnar growth, and clustered fruiting cluster habit. This is the first time that both countries publicly released Pima lines with introgression of American Pima and Uzbek Pima-like breeding genetic material, thereby increasing genetic diversity of Pima cotton. The primary purpose for the germplasm release is to provide to cotton breeders with needed alternative genetic sources FOV4 resistance in Pima cotton. These lines will help to continue reducing the vulnerability of Pima cotton FOV4 and to advance efforts to broaden the genetic base which is critical to the future of the Pima cotton industry in the US and Uzbekistan.
Technical Abstract: Over the past 18 years, Fusarium wilt [Fusarium oxysporum f.sp. vasinfectum (FOV) W.C. Snyder & H.N. Hansen] race 4 (FOV4) has impacted cotton (Gossypium spp.) production in the San Joaquin Valley (SJV) of California, and more recently this pathogen was formally identified in 2017 in southwestern Texas and 2019 in southeastern New Mexico. The primary purpose for the germplasm release is to provide to cotton breeders with needed alternative sources for continuing to improve FOV4 resistance in Pima cotton. PSSJ-FRP01 (PS-592) originated from Pima S-6 x G. barbadense pool accession GB1368/k-7616. Pima S-6 possesses a major gene(s) for FOV4 resistance. GB1368/k-7616 is an Uzbekistan accession introduction with different plant structure, large leaves, columnar growth, and fruiting cluster habit compared to American Pima. PSSJ-FRP02 and PSSJ-FRP03 originated from PS-592 x SA-3208 (LIAO MIAN 7 HAO). SA-3208 is moderately resistant to FOV4. For PSSJ-FRP01, multiple selections were applied toward selection of columnar growth and clustered fruiting habit genotypes. For lines PSSJ-FRP02 and PSSJ-FRP03, recurrent selection was applied based on a single plant selection under greenhouse FOV4 inoculations and FOV4 infested field screenings from F1 to F4. In subsequent field and greenhouse tests, the lines showed improved resistance to FOV4 and fiber quality when compared to commercial cultivars. These lines will help to continue reducing the vulnerability of the Pima cotton industry to this fungal pathogen and to advance efforts to broaden the genetic base which is critical to the future of the Pima cotton industry in the US and Uzbekistan.