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Incidence of Head Smut Sporisorium reilianum (Kühn) Langdon and Fullerton in Sorghum [Sorghum bicolor (L.) Moench.] Hybrids with A1 and A2 Cytoplasms
Víctor Pecina Quintero, Héctor Williams Alanís, Noé Montes García, Raúl Rodríguez Herrera, Enrique Rosales Robles, Víctor Antonio Vidal Martínez;
Revista Mexicana de Fitopatología 2004 22(2)
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Inglés Español
The relationship of cytoplasm type and field resistance to head smut (Sporisorium reilianum), was studied in grain sorghum. Disease incidence at grain physiological maturity was registered on sixteen hybrids in two different cytoplasms (A1 and A2) for a total of 32 hybrids. Sorghum hybrids were grown in El Tapon, Tamaulipas, Mexico, under rainfed conditions from 1990 to 1994, in fields with natural infestation of head smut. Physiological races of the fungus were determined by differential sorghum lines. Significant disease incidence differences were found between cytoplasm types in 1991 and in 1994. Disease incidence was lower in hybrids with A1 cytoplasm. In 1991, only the physiological race 3 was present, being the most prevalent and virulent. Results suggest that sorghum hybrids with A2 cytoplasm may be more susceptible to head smut race 3.

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