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This article in CS

  1. Vol. 11 No. 1, p. 88-91
    Received: July 8, 1970

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Comparison of Expected Genetic Advance with Selection on the Basis of Clone and Polycross Progeny-Test Performance in Alfalfa1

  1. R. R. Hill Jr.2,
  2. M. W. Pedersen2,
  3. L. J. Elling3,
  4. R. W. Cleveland4,
  5. J. H. Graham5,
  6. F. I. Frosheiser6 and
  7. J. L. Starling4



Sixty-seven alfalfa, Medicago sativa L., clones and their polycross progenies were evaluated for hay, seed, and chaff yields. The progenies were also evaluated in separate experiments for resistance to Corynebacterium insidiosum (McCull.) Jens.; Leptosphaerulina briosiana (Poll.) Graham & Luttrell; Pseudopeziza medicaginis (Lib.) Sacc.; Phoma herbarum West. f. medicaginis West, ex. Rab.; and Uromyces striatus Schroet. var. medicaginis (Pass.) Arth. Expected genetic gains with selection on the basis of clone and polycross progeny-test performance were compared for each of the characters. Relative effectiveness of the two methods varied with heritability of the trait and the selection intensity permitted with each method; the polycross progeny test was favored with traits which had low heritability. Expected advance from selection on the basis of polycross progeny-test performance was greater for hay, seed, and chaff yields, but expected advance with individual plant selection was greater for resistance to some of the pathogens.

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