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- Title
Efficiency of selection for resistance to Fusarium wilt race 4 in cotton when conducted in the field versus greenhouse.
- Authors
Zhang, Jinfa; Zhu, Yi; Elkins-Arce, Heather D.; Wheeler, Terry; Dever, Jane K.; Whitelock, Derek; Wedegaertner, Tom; Hake, Kater; Bissonnette, Kaitlyn
- Abstract
Upland cotton (Gossypium hirsutum L.) is the most important fiber crop in the world, and Fusarium wilt caused by the soil-borne fungus Fusarium oxysporum f. sp. vasinfectum (FOV) is one of the most destructive diseases. FOV race 4 (FOV4) causes an early season disease with symptoms including seedling mortality and vascular discoloration (VD). However, breeding for FOV4 resistance in Upland cotton is complex. To address plant selection efficiency under field conditions in a typical pedigree selection process for FOV4 resistance in cotton, a comparative analysis between the field and greenhouse evaluations and selections was performed. Single plant selections (SPS) with no or low VD selected in a FOV4-infested field between 2018 and 2021 were progeny tested in both the field and greenhouse. Results indicated that overall mean plant mortality rate (MR) in the greenhouse across the four years was more than three times mortality in the field (81.9 vs. 22.9%) with a much narrower range (75–89% vs. 10–30%), suggesting a higher percentage of disease escapes in the field. Results from 10 replicated tests each with 32 lines and 4 replications confirmed the higher MR (79.8 vs. 30.5%) with a narrower range (72.0–88.9 vs. 22.2–39.5%) in the greenhouse screening which had lower coefficients of variation (28.3 vs. 61.3%, with a range of 18.6–40.5 vs. 46.7–72.8%) than the field screening, although MR between the field and greenhouse screening was significantly and positively correlated. However, MR in progeny rows in the field was not correlated with that in the greenhouse. SPS selected for no or low VD in Acala 1517–08 and Acala 1517–18 GLS in the greenhouse protocol had lower escapes and significantly reduced MR in their progeny compared to those selected in the field and unselected populations. However, SPS in susceptible Pima S-7 selected in field and greenhouse conditions did not decrease MR in their progeny, suggesting no or very low levels of frequencies of resistance gene(s) and resistant genotypes in this cultivar.
- Subjects
GREENHOUSES; PLANT selection; PLANT mortality; FUSARIUM; FUSARIUM oxysporum; COTTON; PIGEON pea; GENE frequency
- Publication
Euphytica, 2022, Vol 218, Issue 11, p1
- ISSN
0014-2336
- Publication type
Article
- DOI
10.1007/s10681-022-03117-6