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This article in CS

  1. Vol. 36 No. 2, p. 259-265
     
    Received: Aug 16, 1994
    Published: Mar, 1996


    * Corresponding author(s): icrisat@cgnet.com
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doi:10.2135/cropsci1996.0011183X003600020008x

Gene Action for Resistance in Sorghum to Midge, Contarinia sorghicola

  1. H. C. Sharma *,
  2. C. V. Abraham,
  3. P. Vidyasagar and
  4. J. W. Stenhouse*
  1. Cereals Program, International Crops Research Inst. for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India

Abstract

Abstract

Gene action for resistance to sorghum midge (Contarinia sorghicola Coq.) was studied in a diverse array of midge-resistant and midge-susceptible females and males under natural infestation and under uniform infestation with a no-choice headcage technique. Gene action for glume and grain characteristics associated with resistance to sorghum midge was also studied to understand their role in expression of resistance to this insect. Gene action for resistance to midge is largely governed by additive gene action. Genotype × environment interaction was significant for midge damage rating under natural infestation but nonsignificant under no-choice headcage screening. The GCA effects of midge-resistant cytoplasmic male-sterile (CMS) females (PM 7061 A and PM 7068 A) were significant and negative, and such effects for the midge-susceptible CMS females ICSA 42 and 296 A were positive. Similar results were observed for the males (except for CS 3541 and MR 750 for midge damage in one out of two seasons). Dominance (mid-parent heterosis) was also important for midge resistance in some cross combinations. For genotypic nonpreference by the midge females, the SCA effects were greater than the GCA effects. The SCA effects for genotypic nonpreference were negative for PM 7061 A. The GCA effects were significant and negative for glume length in PM 7061 B, glume hardness for 296 B, and glume hairiness for PM 7061 B. The GCA effects were significant and positive for glume length, glume hairiness, and glume hardness of ICSB 42. Resistance is needed in both the parents to produce midge-resistant hybrids.

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