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- Title
Resistance to Rhizoctonia solani and Pythium ultimum in Upland Cotton (Gossypium hirsutum L.).
- Authors
Jones, Whitney M.; Smith, C. Wayne; Starr, James L.
- Abstract
Upland cotton, Gossypium hirsutum L., is grown extensively in the southern United States with an annual farmgate value of $5 billion and an annual national economic impact of over $28 billion. Two seed and seedling disease pathogens, Rhizoctonia solani and Pythium ultimum, are the most significant soilborne pathogens of cotton in the United States. Three germplasm families selected for elevated levels of condensed tannins (HT) along with 'Tamcot Luxor', as a resistant control, were evaluated for resistance to R. solani and two HT families were evaluated for resistance to P. ultimum. Two generations of single plant selections resulted in three generations, C0 (original families or cycle 0), C1 selected from the C0 family, and C2 selected from the C1 generation. Individual plants were challenged with either R. solani or P. ultimum and resistance measured as percent survival or by a disease index rating (DIR). One cycle of single plant selection improved resistance to R. solani from 9.3% survival on average to 31% survival across six HT families while resistance to P. ultimum was improved from 31% survival to an average of 59% survival. Challenging individual plants with appropriate levels of R. solani and P. ultimum appears to be an effective tool for selection of germplasm resistant to these seedling disease causing pathogens.
- Subjects
RHIZOCTONIA solani; PYTHIUM ultimum; COTTON diseases &; pests; PLANT germplasm; SEEDLING diseases &; pests
- Publication
Crop Science, 2016, Vol 56, Issue 4, p1784
- ISSN
0011-183X
- Publication type
Article
- DOI
10.2135/cropsci2015.12.0767