the solanaceae plants produce a variety of interesting biologically active products including the steroid alkaloids solanidine, nicotine and tropane alkaloids. putrescine n-methyltransferase (pmt) is an enzyme that catalyses s-adenosylmethionine-dependent methylation of putrescine in one of the primary steps of nicotine and tropane alkaloids biosynthesis pathway. two tobacco members of the ap2/...

THE activity of phosphatase in the bean, potato, radish and wheat at different stages of their life histories was reported in a previous paper [Ignatieff & Wasteneys, 1936]. The small amounts of material available however made the investigation of the distribution of the enzyme in the various parts of the flower impossible. Such data are needed to complete our knowledge of the distribution of t...

In a previous publication ^ the general situation with respect to the wildfire and the blackfire or angular leaf spot diseases of tobacco (Nicotiana tabacum L.) was discussed and the need for explaining the occurrence of leaf spot epidemics was indicated. It was shown that epidemics of wildfire {Bdcterium tabacum Wolf and Foster) are conditional on the occurrence of leaf water soaking, and the ...