Field assessment of commercial cotton cultivars for Verticillium wilt resistance and yield |
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| Institution: | 1. Texas A&M AgriLife Research, 1102 E. FM 1294, Lubbock, TX, 79403, USA;2. Texas A&M AgriLife Extension Service, 1102 E. FM 1294, Lubbock, TX, 79403, USA;1. School of Electrical Engineering, University of South China, Hengyang 421001, China;2. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China;3. School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;1. College of Science, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193, People’s Republic of China;2. State Key Laboratory of Cotton Biology, Institute of Cotton Research of the Chinese Academy of Agricultural Sciences, Anyang, 455000, People’s Republic of China;1. Spanish-Portuguese Centre for Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, Río Duero 12, Campus de Villamayor, 37185 Salamanca, Spain;2. Departamento de Protección de Cultivos, Instituto de Agricultura Sostenible (IAS), Consejo Superior de Investigaciones Científicas (CSIC), Avenida Menéndez Pidal s/n, 14004 Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Spain;3. Departamento de Agronomía, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario ceiA3, Edificio C4 “Celestino Mutis”, Ctra. de Madrid Km. 396, 14071 Córdoba, Spain;1. State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Sciences, Anyang, Henan, 455000, China;2. USDA-ARS, Salinas, CA, 93905, United States;1. College of Life Science, Qufu Normal University, Qufu 273165, P.R.China;2. State Key Laboratory for Biology of Plant Diseases and Insect Pests/Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China |
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| Abstract: | Verticillium wilt is responsible for substantial yield losses in cotton. The use of cultivars with partial resistance to Verticillium wilt is a preferred management strategy. Cotton breeders utilize rating scales based on severity of foliar symptom expression and/or defoliation when making cultivar selections. The objective of this research was to determine the yield relationship with cultivars grouped by both incidence of Verticillium wilt during the boll filling stage, and late season defoliation in fields with a history of Verticillium wilt. Small plot, replicated cultivar trials were conducted over an 11 year period in west Texas. Cultivars were divided into four classes (A–D) based on normalized wilt incidence (NW) and four classes based on normalized defoliation ratings (ND). Classes were determined through a mixed model analysis of cultivars, with T-test comparisons between a partially resistant check (Fibermax 2484B2F) and a susceptible check (Deltapine 0912B2RF). The A and C classes did not differ (P = 0.05) from the partially resistant and susceptible checks, respectively. Classes were used in a mixed model analysis with lint yield. In a model with only NW classes, lint yield decreased significantly as NW increased with least square mean values of 1421, 1385, 1284 and 1204 kg/ha, for classes A, B, C and D, respectively. In a model with both NW and ND classes, the A/A class combination of NW and ND had a significantly (P ≤ 0.05) higher lint yield (1776 kg/ha) than any other combination. NW/ND class combinations of A/B, B/A, B/B, and C/A had intermediate yields, and ND classes of C or D had the lowest yields. Cultivars with both low wilt and defoliation incidences should result in higher yields in fields infested with Verticillium dahliae. Furthermore, these two rating criteria could be used to standardize the process for developing resistant cultivars. |
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| Keywords: | Cotton breeding Disease resistance |
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