Evaluation of Striga resistance in the secondary and tertiary gene pools of pearl millet uri icon

abstract

  • Experiments were conducted at Cinzana and Samanko, Mali (1998 and 1999, respectively) and at SadorĂ©, Niger (in 1999) to evaluate the resistance of the secondary and tertiary gene pools of pearl millet (Pennisetum glaucum) to Striga hermonthica. In the evaluation of the secondary gene pool, S. hermonthica infestation varied across locations. Levels were lowest at Samako in 1999 (an unusually wet year) and greatest in the pot trial at SadorĂ© in 1999. Coefficients of variation were characteristically high in each experiment, ranging from 75% at Sadore to 191% at Samanko. Although numeric differences in S. hermonthica infestation among entries existed, statistically significant differences were often noted only among the extreme entries. Definitive identification of resistance is not possible from the present data, but parental lines of several hybrids merit further evaluation as sources of resistance. Hybrids involving napiergrass (P. purpureum) tended to have lower overall S. hermonthica infestation across the three evaluations. In the evaluation of the tertiary gene pool, Pennisetum germination was extremely low in 1998 and few plants emerged. No useful data could be obtained from the experiment. In 1999, tertiary gene pool species tended to be poorly adapted to both the Samanko and SadorĂ© environments. Among the 16 species, only P. pedicellatum accessions were adapted to both locations and might be further evaluated for their response to S. hermonthica infestation

publication date

  • 2001