Growth and Differentiation in Plants

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Abstract
The paper discusses recent work in this field. Several equations have been proposed to express the growth curve of plants and animals which indicate the existence of a growth "constant" and a "growth capacity." Rhythmic growth seems to offer no difficulties when considered as a dynamic problem. The relations between size of an organ and point of origin or size of organ upon which it grows are regarded as special cases of the growth process, and their quantitative relationships are discussed. The problem of dominance of apical meristem of a shoot is presented in the light of recent work on the factors involved. Physiological activity, rather than accumulation of tissue-forming substances, seems to be the factor which initiates growth.

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