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This article in AJ

  1. Vol. 73 No. 6, p. 1058-1062
     
    Received: Nov 17, 1980


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doi:10.2134/agronj1981.00021962007300060036x

Relationships Among Components of Seed Yield in Blue Grama1

  1. A. M. Wilson,
  2. R. L. Cuany,
  3. J. G. Fraser and
  4. W. R. Oaks2

Abstract

Abstract

High caryopsis weight in forage plants generally increases seedling emergence, vigor, and establishment. Breeding for improved caryopsis weight in blue grama [Bouteloua gracilis (H.B.K.) Lag. ex Steud.] can be successful only if variations in average caryopsis weight of a plant are not simply a result of variations in the components of caryopsis yield. The objectives of this study were to determine the effects of spikes/culm, spikelets/spike, and fertility on caryopsis weight and the effects of spikes/culm, spikelets/spike, fertility, and caryopsis weight on yield/culm. In a 1,080−plant, spaced field nursery, average caryopsis weight varied among plants from 25 to 70 mg/100. Multiple regression and path analysis indicated that spikes/culm, spikelets/spike, and fertility accounted for only 5% of the variation in caryopsis weight. These components of yield, with caryopsis weight, accounted for 86% of the variation in caryopsis yield/culm. In a polycross nursery of 60 plants selected from the previous nursery primarily for high caryopsis weight, blue grama clones differed significantly in all of the components of caryopsis yield/culm. Blocks in the polycross nursery differed significantly in all components of yield/culm except average caryopsis weight of a plant. These results suggest that it would be possible to select blue grama plants for both high caryopsis weight and high seed yields.

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