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- W2028081010 abstract "1. Cambial growth in Populus balsamifera L. has been stimulated by (a) etiolated buds, (b) leaves in the light, and (c) applied heteroauxin pastes. In all the experiments, shoots showing cambial activity were characterized by a reduced percentage of soluble organic nitrogen in the phloem and wood of the dividing region. 2. Initiation of new root tips in Melilotus alba Desr. did not occur in decapitated plants brought into the greenhouse in November. Branching was increased slightly by the presence of etiolated buds, and markedly by the presence of leaves in the light in either normal or CO2 free air. Increased root formation was accompanied by decreased percentage of soluble organic nitrogen in the storage roots. 3. Elongation of the first internode of Zea mays L. continued for a week or longer but was stopped by illuminating the tips of the plants for twenty-four hours with a Mazda lamp at a light intensity of 100 f.c. The plants showing intercalary growth were characterized by low percentages of soluble organic nitrogen. 4. In the three species studied, diffuse meristems, cambium of poplar, pericycle of sweet clover, and intercalary meristem of maize were active when the soluble organic nitrogen content of the tissue was relatively low and inactive when it was relatively high. At high percentages of soluble organic nitrogen the massed meristems of stem and root tip were stimulated to begin or increase their development. 5. A hypothesis of condensing power is set up to explain the observed facts. According to this hypothesis the massed meristems are able to utilize simple organic forms of nitrogen and to condense these forms into protoplasm in the formation of new cells. The diffuse meristems are less effective or ineffective in condensing simple nitrogenous forms, and can develop only when supplied with partially condensed forms of protoplasm building compounds, probably with simple albuminoid proteins. 6. The condensed forms required by diffuse meristems may be synthesized in darkness in the presence of auxins, with the phloem indicated as the seat of the reactions; or they may be formed in lighted leaves, possibly independently of known growth substances." @default.
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- W2028081010 date "1938-06-01" @default.
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- W2028081010 title "Relation of Condensation Reactions to Meristematic Development" @default.
- W2028081010 doi "https://doi.org/10.1086/334748" @default.
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