Recombination rates of soybean varieties from different periods of introduction and release

T. W. Pfeiffer

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Theory predicts that selection for adaptability during the short term also favors selection for a reduced recombination rate in the population. The objective of this study was to test whether the cyclic short-term selection which has taken place in soybean breeding programs in the USA since the introduction of the crop has measurably reduced recombination frequencies. Thirteen soybean varieties separated into four different release periods (prior to 1940, 1940-1954, 1955-1969, after 1970) were evaluated for their recombination frequencies within three locus pairs. Recombination frequencies among the individual varieties ranged from 7.6 to 24.1 % at the p1r locus pair, from 20.9 to 30.1 % at the lnp2 locus pair, and from 28.7 to 41.6% at the dt1l1 locus pair. Recombination frequencies were significantly different among varieties within a release period for the p1r and lnp2 locus pairs, but recombination frequencies did not differ among release periods for any locus pair. Thus, apparently, plant breeders have developed soybean varieties with improved adaptation without influencing recombination rates.

Original languageEnglish
Pages (from-to)557-561
Number of pages5
JournalTheoretical And Applied Genetics
Issue number5
StatePublished - Jun 1993


  • Glycine max
  • Plant breeding
  • Selection pressure

ASJC Scopus subject areas

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics


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