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Effect of cytoplasmic male-sterility in sorghum on host plant interaction with sorghum midge, Contarinia sorghicola

Summary

Sorghum midge, Contarinia sorghicola Coq. (Diptera: Cecidomyiidae) is one of the most important pests of grain sorghum worldwide. We studied the reaction of midge-resistant and midge-susceptible genic-cytoplasmic male-sterile (A-lines) and their maintainers (B-lines), and the effect of resistant and susceptible restorers on sorghum midge. Midge damage and adult emergence were significantly lower on the B-lines of midge-resistant genotypes (PM 7061 and PM 7068) than their corresponding A-lines, while the reverse was true for the midge-susceptible genotypes (296A and ICSA 42). Differences in midge damage and the number of midges emerged were not significant between the midge-resistant and midge-susceptible A-lines when infested without pollination (except midge emergence on PM 7061A). Pollination with a midge-resistant restorer (DJ6541) reduced midge emergence significantly in one of two seasons. Source of pollen did not influence midge emergence on the highly-resistant A-line, PM 7061A. The implications of these observations in the development of midge-resistant hybrids were discussed.

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Sharma, H.C., Vidyasagar, P., Abraham, C.V. et al. Effect of cytoplasmic male-sterility in sorghum on host plant interaction with sorghum midge, Contarinia sorghicola . Euphytica 74, 35–39 (1993). https://doi.org/10.1007/BF00033764

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Key words

  • Sorghum midge
  • Contarinia sorghicola
  • cytoplasmic male sterility
  • host plant resistance
  • resistance mechanisms
  • sorghum
  • Sorghum bicolor