|CHAGOYA, JENNIFER - Texas A&M Agrilife|
|ARCE, HEATHER - Texas A&M Agrilife|
|ARCE, JOEL - Texas A&M Agrilife|
|DAVIS, ROY - Texas A&M University|
|CHAPPELL, THOMAS - Texas A&M University|
|MONCLOVA-SANTANA, CECILIA - Texas A&M Agrilife|
Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: 1/5/2021
Publication Date: 5/25/2021
Citation: Chagoya, J., Arce, H., Arce, J., Davis, R., Chappell, T., Ulloa, M., Monclova-Santana, C. 2021. Quantification of FOV4 in soils with susceptible or tolerant cotton cultivars. National Cotton Council, Beltwide Cotton Conference. In: Proceedings of the 2021 Virtual Beltwide Cotton Conferences, January 5-7, 2021, Austin, Texas. Paper No. 20562:279.
Technical Abstract: Fusarium oxysporum f. sp. vasinfectum race 4 (FOV4) adversely impacts cotton production causing plant wilt and death. With FOV4 in proximity to the largest Upland cotton producing region in the U.S. – the Southern High Plains of West Texas, the need for developing effective detection protocols is urgent. Twelve cultivars and germplasm including Pima and Upland types with known reactions to FOV4 infection-response were grown in an FOV4 infested field in El Paso County, TX in 2020. To evaluate seedling and plant mortality and top-root vascular infection, stand counts were recorded at 20 and 55 days after planting (DAP), along with root and stem necrosis ratings at 162 DAP. Significant differences were observed for all field data among genotypes. Additionally, soil samples were collected at planting (0 DAP), 55 DAP, and 143 DAP for DNA extraction and quantification of FOV4 using qPCR. Differences were observed among genotypes for soil FOV4 quantity at 55 and 143 DAP, with known susceptible cultivars having greater quantities of FOV4 present in the soil. During this first year while FOV4 quantity did not decrease in the presence of resistant cultivars, planting of resistant cultivars did prevent the exponential increase of FOV4 in the soil, thus potentially providing an effective management technique for the disease. This is the first report in which genotype FOV4 infection response and FOV4 soil inoculum quantity has indicated that host-plant resistance is effective to manage FOV4.