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SummaryThe main objectives of this programme were to determine the variability in yield, morphological traits and the content of active substances in Marrubium vulgare populations and develop a superior cultivar for commercial production and extraction in Canada. Plants were grown in the fields of the Horticultural Research Station of Laval University, Quebec, Canada from 1992 to 1994. There was great variation within the plant population in terms of chromosome number and size, morphology, time of flowering and the shoot yield. The shape and size of somatic chromosomes of horehound showed significant variations. Although the chromosomes had numerical stability, we found aneuploidy and variations in the shape and size of the chromosomes. Such variations might have contributed to the differences in certain morphological features and developmental variations in the population leading to the evolution of different genotypes of this species. The dry shoot yield varied from 6.2 to 67.9 g per plant, while plants... |
