started. As shoot growth occurred, there was a decrease in percentage total ni.trogen, followed by an increase in early fall. Total nitrogen content was closely associated with bud activity in tanweed rhizomes. Protein nitrogen in rhizome extracts was the only other character studied that was positively correlated with bud activity. Peroxidase and polyphenoloxidase activities were closely corre...

In conventional cuttings, auxin applied to achieve rooting is taken up predominantly via the cut surface and not via the epidermal surface of the stem. Even though in tissue-cultured plants the cuticle is poorly developed and the stomata do not function properly, stem segments of apple microcuttings took up labelled indoleacetic acid also predominantly via the cut surface. Stem segments with an...

started. As shoot growth occurred, there was a decrease in percentage total ni.trogen, followed by an increase in early fall. Total nitrogen content was closely associated with bud activity in tanweed rhizomes. Protein nitrogen in rhizome extracts was the only other character studied that was positively correlated with bud activity. Peroxidase and polyphenoloxidase activities were closely corre...

The metabolism of tryptophan by Taphrina deformans has been studied to confirm the reported ability of this organism to produce tryptamine. Such amine production was not observed, despite use of amine oxidase inhibitors at levels which should have resulted in the accumulation of tryptamine in the medium. It has been shown that the metabolites of tryptophan include indolepyruvic acid, indolelact...

Observations were made of the effects of several plant regulators, indole-3-acetic acid, kinetin, abscisic acid, and gibberellic acid, as well as of extracts prepared from leaves and fruit stalks on the respiration pattern, ethylene production, and the number of days to ripen of avocado fruits (Persea americana Mill.). These substances were vacuum infiltrated to insure good penetration and dist...