Functional analysis of nicotine demethylase genes reveals insights into the evolution of modern tobacco.

Abstract excerpt

Tobacco (Nicotiana tabacum L.) is a natural allotetraploid derived from the interspecific hybridization between ancestral Nicotiana sylvestris and Nicotiana tomentosiformis. The majority of cultivated tobacco differs from both of its progenitor species in that tobacco typically contains nicotine as the primary alkaloid, in contrast to its two progenitors that accumulate nornicotine in the senescing leaves....

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