INHERITANCE OF MONOSOMICS IN NICOTIANA RUSTICA

Metabolism of the Methyl Group of Nicotine in Nicotiana rustica.

The methyl group of nicotine has been shown to participate in transmethylation reactions involving methionine (3) and choline (8). De novo synthesis of radioactive nicotine from nornicotine, methioninemethyl-C14 and ATP was demonstrated recently in leaves of Nicotiana alata (9). In the present study the rate of metabolism of the methyl group of nicotinemethyl-C14 ancl the rate of transmethylati...

Carbohydrate-limited Growth Kinetics of Tobacco (Nicotiana rustica L.) Callus.

Logistic curves were fitted to sigmoidal growth data obtained from tobacco (Nicotiana rustica L.) callus grown on media prepared with 0.1, 0.03, 0.01, and 0.003 m sucrose. Analysis of the growth curves indicated that final yields and specific growth rates were influenced by the initial sucrose concentration. Growth yields from the four treatments were similar (0.61 +/- 0.04 gram dry tissue per ...

The Grana of Starch-free Chloroplasts of Nicotiana Rustica

The grana of chloroplasts of starch-free leaves of Nicotiana rustica are described in detail. Leaf sections were fixed in 2.5 per cent KMnO(4) and embedded in mixtures of butyl and ethyl methacrylate. Chain length of the polymer was modified by use of a transfer agent. The grana are composed of compartments consisting of electron-scattering partitions and electron-transparent loculi. Compartmen...

The Analysis of Continuous Variation in a Diallel Cross of Nicotiana Rustica Varieties.

TATISTICAL methods for the analysis of continuous variation have been S developed using second degree statistics such as variance and covariance and successfully applied to crosses between two inbred lines. These have allowed the recognition of the more familiar phenomena associated with Mendelian genetics although they appear in the analyses in a new and less obvious form (MATHER 1949; BATEMAN...

The Environmental Induction of Heritable Changes in NICOTIANA RUSTICA. Effects of Genotype-Environment Interactions.