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Crop Science Abstract -

Use of Partially Male-Sterile Perennial Ryegrass for Hybrid Cultivar Production1


This article in CS

  1. Vol. 21 No. 3, p. 415-418
    Received: Dec 27, 1979

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  1. B. S. Ahloowalia2



The possibility of breeding ryegrass hybrid varieties based on partial male-sterility was investigated. Frequency of hybridization between perennial ryegrass, Lolium perenne L., and annual ryegrass, L. multiflorum Lam., was determined by using two partially male-sterile perennial ryegrass genotypes. Clones of a desynaptic diploid (2n = 14) and a trisomic (2n = 15) perennial ryegrass plant were inter-pollinated with annual ryegrass plants having the dominant markers fluorescent-roots and awned-florets. The progeny of perennial × annual ryegrass showed fluorescent-roots and all except two plants had awned-florets, suggesting 100% hybridization on inter-pollination. In the reciprocal crossings, annual × perennial ryegrass, hybridization frequency approached 100% with the trisomic pollinator, but was only 29% with the perennial desynaptic pollinator. Although most F1 plants were fertile and had good seed set, mortality in F2 and back-crosses was high. It was concluded that partially male-sterile genotypes can be used for the production of hybrid ryegrass cultivars.

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