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Components of Seed Yield and Associated Characteristics in Lotus corniculatus L.¹

Data were obtained on 12 variables in a replicated clonal nursery containing 20 genotypes of birdsfoot trefoil, Lotus corniculatus L., with plants spaced at 40-inch centers. Broad sense genetic variability (heritability) estimates suggested that a large part of the phenotypic variation present was genetically controlled. Values of expected gain from selection suggested that seed yidds of 93% over the mean of the population studied should be attainable through selection of the top 10% of the population. Prostrate-type plants had higher mean values for seed yield and all of its potential components than did upright-type plants.

Progeny plants from crosses in all combinations between 2 prostrate and 2 upright-type clones included in the clonal nursery were studied in 2 progeny nurseries. Plants in one of these nurseries were spaced at 36-inch centers and those of the other at 12 by 16-inch spacing. Genetic variability estimates were generally higher at the 12 by 16-inch spacing than corresponding estimates from the wider-spaced nursery. Progenies from crosses of prostrate X upright types (and reciprocals) were superior to progeny from prostrate X prostrate or upright X upright for most of the characters studied. This differential in performance was usually greatest at the closer spacing.

Path coefficient analyses showed that number of umbels setting seed had the greatest influence upon seed yield, both directly and indirectly, of components analyzed. Phenotypic and genotypic coefficients of determination for the actual components studied in the clonal nursery were 89% and 96%, respectively, compared to those of 27% and 45% for the potential components.

² Former Purdue Research Fellow (now Associate Professor of Agronomy, South Dakota State University) and Professors of Agronomy, Pnrdue University, Lafayette, Indiana.

Received for publication February 26, 1966.

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