Abstract

By the carrot-assay method it has been shown that the watery endosperm of coconut contains the growth-promoting coconut-milk factor at all stages of development. Some activity is shown by the parts of the immature embryo but not by the solid endosperm. Sources of analogous activity are in the endosperm of Zea mays in the milk stage, the gelatinous content of immature fruits of Fuglans regia, and the young gametophyte of Ginkgo biloba. The data for other cases examined suggest that the material develops best in nutritive tissues associated with delayed embryo development.

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