Department of Forage Production and Animal Breeding, Institute of Forage Crops, Pleven, Bulgaria
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Abstract. Seed heterogeneity (regarding some main parameters) in dependence of their position on mother plant was found in a study conducted with 11 varieties of Lupinus albus L. At technological maturity, pods (respectively the seeds in them), situated in the lower (1st layer) and upper half (2nd layer) of 20 plants, selected randomly, were collected separately. The results of the conducted analyzes showed that 1000 seeds mass, germination, germ length and weight of the seeds from the 2nd layer were lower in comparison with those from the 1st layer by an average of 12.3, 4.2, 13.1 and 19.5%, respectively. In contrast, the crude protein content of the 2nd layer seeds exceeded the protein content of the 1st layer seeds by a relative value of 15.0%. The seedling vigour index, as a summary indicator for evaluation, showed higher viability of the seeds formed in the pods from the 1st layer (1028) compared to the vigour of the seeds from the 2nd layer (856).
Keyword: seeds, heterogeneity, growth parameters, seedling vigour index, seed-layers effect.