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ISHS Acta Horticulturae 749: I International Symposium on Chamomile Research, Development and Production

THE EFFECT OF CONTAMINATING AN /-/-Α-BISABOLOL WITH AN /-/-Α-BISABOLOLOXIDE (A, B) CHEMOTYPE OF TETRAPLOID CHAMOMILE

Authors:   E. Mader, B. Bein-Lobmaier, J. Novak, C. Franz
Keywords:   chamomile, contamination, population genetics, quality assurance, tetraploid, /-/-α-bisabolol, /-/-α-bisabololoxides
DOI:   10.17660/ActaHortic.2007.749.8
Abstract:
Tetraploid highbreed-cultivars of German chamomile differ significantly in their essential oil composition. In order to estimate the risk of genetic contamination resulting in quality losses, a population of 198 plants of the tetraploid /-/-α-bisabolol-type cultivar ‘Manzana’ was crossbred by open pollination with 2 plants of the bisabololoxide-containing cultivar ‘BK-2’. The “bisabololoxide-content” is transmitted dominantly by the gene O/o. Five subsequent generations of this crossbreeding were analyzed and the results compared with expected values of the Hardy-Weinberg equilibrium for tetraploid organisms. The observed values showed a high correspondence with the theoretical ones in each generation, especially at calculation models presupposing ‘BK-2’ individuals with three to four dominant alleles and a potential crossing over during meiosis. According to the present results changes in quality of herbal starting materials are predictable and calculable.

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