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  1. Vol. 8 No. 5, p. 532-534
     
    Received: Oct 26, 1967
    Published: Sept, 1968


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doi:10.2135/cropsci1968.0011183X000800050007x

Tester Performance Level in Topcrosses of Smooth Bromegrass, Bromus inermis Leyss.1

  1. P. W. Voigt2

Abstract

Abstract

‘Manchar’ and ‘Sac’ smooth bromegrass, Bromus inermis Leyss., were topcrossed to 96 selected clones. These cultivars were used as male parents because of their different performance levels. Manchar and Sac topcross progenies were evaluated in separate row trials for emergence vigor, spring vigor, forage yield, disease reaction, spread, leafiness, height, lodging, regrowth vigor, and fertility. Correlations between the trials for these characters ranged from .38** to .77** and indicated that in most cases the two testers ranked the clones in much the same way. The low performing tester gave significantly better discrimination for lodging only. The results do not support the hypothesis that in smooth bromegrass testers with a high frequency of desirable genes are necessarily ineffective because of the masking effects of dominance.

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