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This article in CS

  1. Vol. 27 No. 4, p. 648-652
     
    Received: May 12, 1986


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doi:10.2135/cropsci1987.0011183X002700040007x

Resistance to Phomopsis Stem Blight in Lupinus Angustifolius L.1

  1. W. A. Cowling,
  2. J. Hamblin,
  3. P. McR Wood and
  4. J. S. Gladstones2

Abstract

Abstract

Phomopsis leptostromiformis (Kühn) Bubák causes Phomopsis stem blight in narrow-leafed lupin (blue lupine; Lupinus angustifolius L.). In southern Australia, Phomopsis stem blight appears on lupins during senescence when dark lesions and fruiting bodies develop on stems. P. leptostromiformis colonizes dead stems and produces a mycotoxin that is responsible for lupinosis in livestock that graze lupin stubble. We sought high levels of resistance to Phomopsis stem blight in wild L. angustifolius and attempted to transfer resistance to domesticated types by crossing with susceptible cultivars. Resistance was rated by estimating the proportion of mature, dry stems covered with stem blight lesions. Phomopsis stem ratings of 254 accessions of wild L. angustifolius ranged from < 1% (highly resistant) to 36% (highly susceptible) at two Western Australian field sites in 1977. Stem ratings of the wild lupins were subject to a large accession ✕ site interaction. Resistant accessions came from a range of habitats within several Mediterranean countries. Many accessions were crossed with susceptible cultivars, and F4-derived progeny, reselected for domestic traits, were tested for resistance at up to five Western Australian sites from 1981 to 1983. Stem ratings of F4-derived progeny ranged from 3 to 37% and susceptible cultivars from 26 to 38% when averaged across the 3 yr. Variance component estimates for line ✕ site and line ✕ year interactions were relatively small. Heritability of resistance was high (0.86-0.92) when estimated on a line mean basis across sites in 1982. Heritability was reduced (0.49-0.83) when estimated across years involving 1983, due to low average Phomopsis stem ratings (< 20%) in 1983, which inflated line ✕ year variance components. Resistance to Phomopsis stem blight was successfully transferred from wild to domesticated L. angustifolius.

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