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Independent Inheritance of Genes for Dhurrin and Leucoanthocyanidin in a Sorghum Cross
Author(s) -
Haskins F. A.,
Gorz H. J.
Publication year - 1988
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1988.0011183x002800050033x
Subject(s) - backcrossing , biology , sorghum bicolor , sorghum , inheritance (genetic algorithm) , botany , gene , genetics , agronomy
Flag leaves of KS8 sorghum [ Sorghum bicolor (L.) Moench] are low in dhurrin [ p ‐hydroxy‐(S)‐mandelonitrile‐β‐D‐glucoside] content and thus in hydrocyanic acid potential (HCN‐p), and they contain little (if any) leucoanthocyanidin (LAC). Comparable leaves ‘Colman’ sorghum are intermediate in HCN‐p and high in LAC. This study was conducted to investigate the inheritance of HCN‐p and LAC in crosses of KS8 ✕ Colman. Flag leaves from field‐grown plants of both parents; the F 1 , KS8 ✕ Colman; the backcross, KS8 ✕ (KS8 ✕ Colman); and the F 2 , (KS8 ✕ Colman) selfed, were assayed for both HCN‐p and LAC. Assays for HCN‐p indicated that the backcross values provided a good fit to 1 intermediate:1 low ( X 2 = 0.05, P = 0.82) and F 2 results to 3 intermediate:1 low ( X 2 = 0.96, P = 0.33). For LAC, backcross results were 1 LAC+:1 LAC− ( X 2 = 0.20, P = 0.65) and F 2 values were 3 LAC+:1 LAC− (exact fit). Classification for both traits yielded good fits to 1:1:1:1 for the backcross ( X 2 = 0.30, P = 0.96) and 9:3:3:1 for the F 2 ( X 2 = 3.24, P = 0.36). These results indicated that the difference in HCN‐p between Colman and KS8 depended primarily on a single gene, the difference in LAC depended largely on a separate single gene, and the HCN‐p gene and the LAC gene were not linked.