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Crop Science Abstract -

Evaluation of R-Lines from the Sorghum Random-Mating Populations NP3R1


This article in CS

  1. Vol. 24 No. 1, p. 9-12
    Received: Dec 17, 1982

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  1. C. E. Otte,
  2. W. M. Ross,
  3. C. Y. Sullivan,
  4. R. L. Voigt and
  5. F. R. Miller2



Sixty sorghum [Sorghum bicolor (L.) Moench] F1 hybrids produced by crossing two A-lines (cytoplasmic male steriles) with 30 R-lines (fertility restorers) were grown in two environments each in Nebraska and Arizona. The primary objective was to compare two sets of related hybrids, one set made with lines derived from a random-mating population and the other made with component lines of the population. A second objective was to determine the effect of parental line selection environment on hybrid performance. The 30 R-lines were composed of three groups: 10 well-adapted component lines of the random-mating population NP3R, 10 lines selected from the NP3R population in Nebraska, and 10 selected from NP3R in Arizona. The Arizona and Nebraska lines were furlher identified by their origin as being selected under high-moisture or low-moisture environments in each state. Hybrids fron3 the selected lines averaged 0.22 Mg ha−1 higher yield than hybrids from the component lines, which was statistically significant. There was no difference between the mean yields of the hybrids produced from the Arizona and Nebraska selections. Hybrids produced from the Arizona low-moisture selections were 6 to 8 cm taller and 0.20 to 0.45 Mg ha−1 higher yielding than Ihose produced from the other groups. Hybrids from the Arizona selections Itowered 2 days earlier than from the Nebraska selections. Statistical differences also existed among hybrids of the male groups for tillering, 100-seed weight, and grain protein percentage, but they were not of great practical importance. The study demonstrated that parental lines can be selected from a sorghum random-mating population that will produce suitable hybrids. Extensive genetic recombination in random-mating populations makes their use feasible as sources of inbreds.

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