Pedigree selection under field conditions within Acala 1517-08 and its glandless derivatives for development of cotton r
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Pedigree selection under field conditions within Acala 1517-08 and its glandless derivatives for development of cotton resistant to Fusarium wilt caused by Fusarium oxysporum f. sp. vasinfectum race 4 Jinfa Zhang . Abdelraheem Abdelraheem . Yi Zhu . Terry A. Wheeler . Jane K. Dever . Heather Elkins-Arce . Robert Nichols . Tom Wedegaertner
Received: 7 August 2020 / Accepted: 31 August 2020 Ó Springer Nature B.V. 2020
Abstract The soil- and seed-borne fungus, Fusarium oxysporum f. sp. vasinfectum race 4 (FOV4), causes Fusarium wilt in cotton (Gossypium spp.) and represents a significant threat to cotton production in the US. The objectives of this study were to enhance FOV4 resistance in heterogeneous Acala 1517-08 and its derivatives through three cycles of pedigree selection in 2018, 2019 and 2020 under FOV4infested field conditions. In 2017, in a field not infested with FOV4, 46, 12, and 23 single plants were selected for productivity from a base population of 1100–1400 plants of Acala 1517-08 and its derived glandless lines, Acala 1517-18 GLS and NM 13P1125, respectively. In 2018, the single plant selections, controls and other lines were tested in progeny-rows in an FOV4 infested field for disease responses including mortality rate (MR), root vascular staining (RVS), and
J. Zhang (&) A. Abdelraheem Y. Zhu Department of Plant and Environmental Sciences, New Mexico State University, Las Cruces, NM 88003, USA e-mail: [email protected] T. A. Wheeler J. K. Dever Texas A&M AgriLife Research, 1102 E. Drew St., Lubbock, TX 79403, USA H. Elkins-Arce Texas A&M AgriLife Research, 1380 A&M Circle, El Paso, TX 79927, USA R. Nichols T. Wedegaertner Cotton Incorporated, Cary, NC, USA
disease incidence (DI), resulting in 41, 15, and 26 single plants selected from progenies of the three lines, respectively, based on RVS. These single plant selections were tested in 82 progeny-rows in the same field in 2019, and the second selection cycle based on RVS advanced 40, 16, and 37 plants selected from the progenies of the three lines, respectively, for further evaluation and the third selection cycle in a progeny test in 2020. In 2020, an average of 81–84% plants died in highly susceptible controls, Pima S-7 and Pima DP 744, due to FOV4 infections, while the resistant controls, Pima S-6, Pima PHY 841 RF and NuMex COT 17 GLS, incurred up to 19–24% mortality. As a result of the three cycles of single plant selection, a total of 12 progenies were identified to be as resistant as the resistant controls. On the progeny basis, MR between years was significantly correlated, and MR at different evaluation dates was also significantly correlated with one another and with mean RVS and DI within year. However, due to possible escapes of plants from FOV4 infections, the original RVS scores of individual plant selections were not correlated with their respective progenies; and no significant differences were detected among progeny means grouped based on RVS ratings for single plant selectio
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