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This article in CS

  1. Vol. 16 No. 2, p. 247-251
     
    Received: June 12, 1975


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doi:10.2135/cropsci1976.0011183X001600020021x

Performance of Diallel Crosses and Second Generation Synthetics of Alfalfa Derived from Partly Inbred Parents. I. Forage Yield1

  1. P. Rotili2

Abstract

Abstract

In an alfalfa (Medicago sativa L.) breeding study conducted under conditions of high competition between plants, combining ability [or forage yield was evaluated from diallel crosses among selected parents which had been partly inbred by selfing. The performance of first and second generation synthetics was studied as well. General combining ability (GCA) variance was considerably larger than specific combining ability (SCA) variance for all generations of parental inbreeding (S0, S1, S2, S3, and S4). In general both GCA and SCA increased with inbreeding. The best single crosses came from selected inbred parents. Selling and subsequent selection improved the genetic value of the parents and resulted in improved synthetic varieties. Breeding synthetic varieties based on four selected S2. plants might well be an efficient method to improve yield of alfalfa.

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