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This article in CS

  1. Vol. 16 No. 4, p. 458-461
     
    Received: July 29, 1975


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doi:10.2135/cropsci1976.0011183X001600040004x

Sources and Inheritance of Resistance to Stemphylium Leafspot of Alfalfa1

  1. O. L. Borges,
  2. E. H. Stanford and
  3. R. K. Webster2

Abstract

Abstract

Twenty-three accessions of alfalfa were screened for resistance to Stemphylium leafspot. A high degree of resistance was found in collections of Medicago cancellata M.B., M. falcata L., M. coerulea Less., and M. hemicycla Grossh. However, all of the M. saliva L. introductions were susceptible to Stemphylium botryosum Wallr.

The inheritance of resistance was investigated in selections from M. cancellata (2n=48), M. falcata (2n=32), and M. hemicycla (2n=16). The results showed that resistance in M. hemicycla was determined by a pair of dominant genes with duplicate effects. Our observations indicated that there is a dosage effect of dominant genes on the level of resistance. The mode of inheritance involved in the resistance of the M. falcata and M. cancellata selections was not clear.

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