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Evaluation of Adapted Wheat Cultivars for Tolerance to Pythium Root Rot
R W Higginbotham1, T C Paulitz2, K G Campbell3
1Department of Crop and Soil Sciences, Washington State University, Pullman 99164-6420.
Plant Disease
|March 1, 2019
Summary
Researchers identified wheat (Triticum aestivum) genotypes tolerant to Pythium root rot, a significant fungal disease. This finding is crucial for developing sustainable control strategies and improving wheat crop resilience.
Area of Science:
- Plant Pathology
- Agricultural Science
- Genetics
Background:
- Pythium species are major fungal pathogens causing root rot in wheat (Triticum aestivum).
- Currently, no effective long-term or sustainable control methods exist for Pythium root rot.
- Identifying genetic resistance in wheat is essential for disease management.
Purpose of the Study:
- To assess the tolerance levels of diverse wheat germplasm to Pythium root rot.
- To identify specific wheat genotypes exhibiting resistance to Pythium species.
Main Methods:
- Wheat genotypes were screened using virulent isolates of Pythium debaryanum and P. ultimum.
- Plants were grown in infested soil under controlled growth chamber conditions (16°C, 12-h photoperiod).
- Shoot (plant height, leaf length) and root (digital scanning, WinRhizo analysis) parameters were measured.
Main Results:
- Significant differences in plant growth and root development were observed among wheat genotypes.
- A strong correlation (P < 0.0001) was found between plant stunting and root loss.
- Genotypes KS93U161, OH708, and Sunco demonstrated the highest tolerance to Pythium root rot.
Conclusions:
- Specific wheat genotypes exhibit tolerance to Pythium root rot, offering potential for breeding programs.
- These tolerant genotypes represent valuable resources for developing resistant wheat cultivars.
- The study provides a foundation for sustainable management of Pythium root rot in wheat.
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