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The genetics of jassid resistance in cotton

III. The kapas purao, kawandapunctatum and Philippines ferguson group

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Summary

Two Upland (Gossypium hirsutum) varieties (Kapas Purao and Philippines Ferguson) and apunctatum cotton of unknown origin, were all shown to carry a key hairiness gene at theH 1 locus. This gene is so closely linked withchl 1 (one of the two complementary genes governing chlorophyll deficiency) that transferences of it to Sakel, which carrieschl 2, cannot produce strains homozygous for hairiness. This allele has been calledH 1 k, and it is considered probable that theH 1 k-chl 1 segment of chromosome is invertedvis-à-vis theH 1-Chl 1 segment in Sakel and inG. barbadense in general, andvis-à-vis theH 1-chl 1 segment in MU8b and otherG. hirsutum varieties.

In addition toH 1 k, Ferguson carries modifying genes which lengthen the hairs, minor H genes which can themselves directly confer hairiness, and modifying genes reducing the density of hair population.

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Authors and Affiliations

  1. Research Division, Sudan Ministry of Agriculture, Sudan

    R. L. Knight

  2. Empire Cotton Growing Corporation and Research Division, Sudan Ministry of Agriculture, Sudan

    J. Sadd

Authors
  1. R. L. Knight
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  2. J. Sadd
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Knight, R.L., Sadd, J. The genetics of jassid resistance in cotton. Journ. of Genetics 52, 186–198 (1954). https://doi.org/10.1007/BF02981498

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  • DOI: https://doi.org/10.1007/BF02981498

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