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The effects of exogenous concentrations of glucose and nitrate on total ethanol extractable phenols and leucoanthocyanins were studied in Paul's Scarlet Rose cells grown in either liquid suspension or solid culture. Aliquots of liquid suspension cultured cells were harvested during logarithmic, early stationary, and late stationary periods of growth for determination of fresh weight, dry weight, total ethanol extractable phenols and leucoanthocyanins. Cells produced phenols during all phases of growth, but at stationary phase, the production was greatest. Increasing concentrations of exogenous glucose in the culture medium resulted in an increased synthesis of total phenols in logarithmic cells, and an increased synthesis of total phenols and leucoanthocyanin in stationary cells. Addition of increased concentrations of exogenous nitrate to the stationary cells grown in suspension culture markedly reduced synthesis of leucoanthocyanins although total phenol synthesis was not significantly affected. Similar observations were made in cells cultured on solid medium in respect to exogenous glucose concentrations, however these cells differed from the suspension cultured cells by having increased amounts of total phenol synthesis and decreased synthesis of leucoanthyocyanins in the presence of increasing concentrations of exogenous nitrate in the culture medium. [ABSTRACT FROM AUTHOR]

The usefulness of exogenous nicotine as a factor in the induction of morphogenesis in a tobacco tissue culture medium has been demonstrated. Nicotiana rustica callus cell cultures were grown on a modified Murashige and Skoog medium with 2 mg/l indoleacetic acid (IAA) and 0.2 mg/l kinetin (MMS). Root morphogenesis was induced in roller tube callus cell cultures and solid callus cell cultures grown on MMS without kinetin supplemented with 10-100 mg/l nicotine. Optimal nicotine concentration for root induction was 50 mg/l. Other tests using varying combinations of IAA, kinetin and nicotine produced no obvious morphogenesis, although some changes in the amount of callus growth and endogenous protein concentration did correlate with nicotine concentration relative to the presence of IAA and/or kinetin. In liquid MMS medium, 14C-nicotine was primarily incorporated into the protein fraction of cultured cells while primarily incorporated into the cell wall and/or cell membrane fraction of cells cultured on MMS without kinetin in the medium. In MMS without IAA and MMS without both IAA and kinetin, there was incorporation, but to a lesser extent in both the protein and the cell wall and/or cell membrane fractions. [ABSTRACT FROM AUTHOR]

An excerpt from the document "The Technique of International Conferences," by W. R. Sharp is presented.

Plants were regenerated from cultured leaf explants of an inbred variety of Lycopersicon esculentum. Seeds were collected from the regenerated plants and sown in the greenhouse. The resultant plants were then evaluated in the field. Several monogenic mutations segregated in the progeny of regenerated plants. The recovery of single gene mutations is evidence that plant tissue culture can be mutagenic. Complementation tests revealed that one mutation was located on the long arm of chromosome 10.