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Genetic variation for seed yield components of westerwold ryegrass lolium multiflorum var westerwoldicum



Genetic variation for seed yield components of westerwold ryegrass lolium multiflorum var westerwoldicum



Netherlands Journal of Agricultural Science 37(2): 119-128



Genetic variation for seed yield components was studied in four diploid varieties of Westerwold ryegrass. Per variety, 19 genotypes were grown in the field in two clonal replicate rows (minirows). We determined the number of inflorescences per minirow, the number of spikelets per inflorescence and florets and seeds per spikelet, 1000-grain weight and seed yield per minirow. Floret site utilization (FSU) was calculated as (seeds/florets) .times. 100%. Genotypic variation and heritabilities were calculated. Correlation studies and path analyses were carried out in each variety separately. Among varieties, no significant differences occurred for seed yield. However, within varieties large genetic variation was present for both seed yield and yield components. Path analyses revealed, that relationships between seed yield components differed to a great extent among varieties. FSU was the major yield component in three varieties, but in one variety, inflorescence number was the most important yield component. There was ample opportunity for genetic improvement of seed yield. FSU had a very high heritability and was not correlated with any of the other seed yield components.

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Accession: 007375410

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