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Crop Science Abstract -

Response of Soybean Populations to Inbreeding Under Two Photoperiods1


This article in CS

  1. Vol. 20 No. 4, p. 499-501
    Received: Nov 16, 1979

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  1. Tuneo Sediyama and
  2. J. R. Wilcox2



Three soybean [Glycine max (L.) Merr.] populations were advanced four generations by single seed descent (SSD) under a 12 and 14-hour photoperiod. The objective was to determine if the populations differed for seed yield plant maturity, height, and lodging, when advanced under these two photolperiods.

Advancing the three populatmns by single seed descent did not result in significantly different population means or variances for seed yields, maturity, plant height, or lodging under these photoperiods. However, early maturing determinate segregates in one cross did not survive under the 14-hour photoperiod. Distribution of lines did vary in some crosses, with skewness toward early maturing and low yielding lines in two crosses and toward high lodging scores in one cross. However, these deviations from normal distributions were not consistently associated with photoperiod. The data indicated that advancing these populations four generations by SSD under these two photoperiods did not result in consistent changes in the populations for these agronomically important characteristics.

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