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This article in CS

  1. Vol. 26 No. 1, p. 65-67
     
    Received: Mar 27, 1985


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doi:10.2135/cropsci1986.0011183X002600010015x

Inheritance of Dhurrin Content in Mature Sorghum Leaves1

  1. H. J. Gorz,
  2. F. A. Haskins and
  3. K. P. Vogel2

Abstract

Abstract

Seedlings of both KS8 and N32 sorghum[Sorghumb bicolor (L.) Moench] were high in dhurrin [p-hydroxy-(S)-mandelonitrile-β- D-glucoside] and thus in hydrocyanic acid potential (HCN-p), but the HCN-p of mature leaves from field-grown plants of KS8 was only about one-tenth as high as that of N32. A study of the inheritance of this large difference between KS8 and N32 revealed that a single major gene pair was responsible. There were no obvious maternal effects and Fl'S were generally intermediate in HCN-p level betweent he two parents, indicating that neither high nor low HCN-p was completely dominant. HCN-p level was inttuenced by genetic background since mean values of the low and intermediate HCN-pcl asses increased slightly as the proportion of genetic background ascribable to N32 was increased. A survey of 102 additional sorghums revealed that the gene for low HCN-p carried by KS8 does not appear to occur widely because KS8h ad the lowest HCN-pof all entries assayed.

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