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Heritability of thrips resistance in the ‘IPA-3’ onion cultivar in South Texas

Abstract

A two season study was conducted to compare the onion cultivars TG1015Y and IPA-3 for resistance to thrips in South Texas. Narrow and broad sense heritabilities were estimated from populations developed from the cross, ‘IPA-3’ × ‘TG1015Y’. Parents, F1, F2, and the respective backcross populations were evaluated for thrips numbers at the Texas Agricultural Experiment Station, Weslaco, TX. ‘IPA-3’ had significantly fewer thrips than ‘TG1015Y’ in both seasons. Yield was significantly different only in the 1996–97 season. The heritability of thrips resistance in this study was very low. Depending on the methods of estimation h 2 was 5.3% and 4.0%, and H 2 was 4.1% and 8.0%. These results suggest that greater genetic gains for thrips resistance in onion can be achieved by selection on a family basis rather than using single plant selection.

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Hamilton, B.K., Pike, L.M., Sparks, A.N. et al. Heritability of thrips resistance in the ‘IPA-3’ onion cultivar in South Texas. Euphytica 109, 117–122 (1999). https://doi.org/10.1023/A:1003624814019

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  • DOI: https://doi.org/10.1023/A:1003624814019

  • Allium cepa
  • Frankliniella occidentalis(Pergande)
  • host plant resistance
  • onion thrips
  • Thrips tabaci Lindeman
  • western flower thrips