Variation in the expression of specificity in two maize diseases [fungi]
1982
Jenns, A.E. | Leonard, K.J. (North Carolina State Univ., Raleigh (USA). Dept. of Plant Pathology) | Moll, R.H.
Ten inbred lines from the open-pollinated maize varety Jarvis were selected from 51 randomly collected lines to represent a wide range of susceptibility to one isolate each of Bipolaris maydis or Colletotrichum graminicola. Ten isolates of each pathogen were selected for a range of virulence on a maize line with average resistance. Resistance and virulence ratings were based on lengths of lesions that developed on leaves of greenhouse-grown seedlings inoculated with 5 mu-l droplets of suspensions of known spore concentrations. For each disease the 10 maize lines were inoculated in all possible combinations with the 10 pathogen isolates. The experiment was run 6 times with each pathogen. Analysis of variance for individual trials indicated a significant interaction between maize lines and B. maydis isolates in all 6 trials and between maize lines and C. graminicola isolates in 4 of 6 trials. For both diseases, the combined analysis over all 6 trials revealed no significant interaction. Apparently the expression of specificity in these host-pathogen interactions is variable.
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