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Crop Science Abstract -

Inbreeding Medicago sativa L. by Sib-mating I. Cross-, Sib-, and Self-Fertility1


This article in CS

  1. Vol. 7 No. 4, p. 281-284
    Received: Dec 19, 1966

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  1. M. K. Aycock Jr. and
  2. C. P. Wilsie2



Sib-mating without selection was compared with selling as a method of inbreeding alfalfa. Through two generations, the drastic loss in fertility following self-fertilization was reduced by approximately half through the slower form of inbreeding (sib-mating).

In two populations, (a) a random population of noninbred ‘Vernal’ and (b) a composite S1 population derived from Vernal, self-fertility was significantly correlated with sib- and cross-fertility. Heritability estimates indicated that fertility was highly heritable.

Inbreeding coefficients were computed for the several levels of inbreeding attained and, in general, the reduction in fertility observed was much greater than that expected in an autotetraploid species. Reasons for the rapid loss in fertility following inbreeding and the possibilities for continuing sib-mating for several more generations are discussed.

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