Leaf discs of Nicotiana rustica L. were floated on NaCl in the presence of kinetin or abscisic acid. On the 5th day (14)CO(2) fixation, [(3)H]leucine incorporation, stomatal conductance, and chlorophyll content were determined. Kinetin either partially or completely reversed the inhibitory effects of NaCl while ABA had no effect.

Tobacco products, including cigarettes, cigars, chewing tobacco, snuff, and loose pipe tobacco, contain the dried, processed leaves of the tobacco plant Nicotiana rustica or Nicotiana tabacum. All forms of tobacco contain nicotine, an extremely addictive drug that can act as both a central nervous system stimulant and depressant. In addition to nicotine, tobacco contains thousands of other chem...

Glutamate, a proposed precursor of the pyrrolidine ring of nicotine, was isolated and degraded after metabolism of 14C02 for 6 hours by Nicotiana rustica and Nicotiana glutinosa and after metabolism of acetate-2J4C for 2 hours by N. rustica. The 14C distribution in glutamate from N. glutinosa after 6 hours of W02 metabolism was 20.2, 14.3, 13.9, 24.4, and 26.6%, in C-l through C-5, respectively...

Crosses between three distinct species in Nicotiana are comparatively rare, only nine having appeared in the literature on this genus. The one here reported upon, (rustica Xpaniculata) x Langsdor i , as well as (rustics X Tabacum) Xpaniculata, and (rustica X paniculata) XgZutinosa, was produced in Europe many years ago (EAST 1928) but has not been studied much since. In 1930 KOSTOFF also descri...

The ricinine content of etiolated seedlings of Ricinus communis increased nearly 12-fold over a 4-day period. In plants quinolinic acid is an intermediate in the de novo pathway for the synthesis of pyridine nucleotides. The only known enzyme in the de novo pathway for pyridine nucleotide biosynthesis, quinolinic acid phosphoribosyltransferase, increased 6-fold in activity over a 4-day period w...