. Plant physiology. Plant physiology. DEVELOPMENT AND REPRODUCTION 299 parts soon occurred and a new plant was formed. Examination of the sap showed that the upper portion, down as far as the plane of the graft, contained inulin in abundance, while the part below the plane of the graft contained starch but no inulin. In this case the simple organic substances in the sap of both portions were produced in the artichoke leaves above. In the reverse experi- ment, where the upper part was sunflower and the lower Jerusalem artichoke, a similar result was obtained; namely, that starch but ho inulin w
. Plant physiology. Plant physiology. DEVELOPMENT AND REPRODUCTION 299 parts soon occurred and a new plant was formed. Examination of the sap showed that the upper portion, down as far as the plane of the graft, contained inulin in abundance, while the part below the plane of the graft contained starch but no inulin. In this case the simple organic substances in the sap of both portions were produced in the artichoke leaves above. In the reverse experi- ment, where the upper part was sunflower and the lower Jerusalem artichoke, a similar result was obtained; namely, that starch but ho inulin was present in the sunflower portion while the artichoke portion, which here received its simple organic substances from the sunflower leaves, contained an abundance of inulin. b m Fig. -Three varieties of gourd grafted upon one another; a, i fruits jaunes; b, poire verte; c, d fruits blancs. and even bore tubers, in which inulin accumulated in the same way as if the whole plant had been of the artichoke species. Inulin clearly acts only as a reserve carbohydrate. In both experiments the products of photosynthesis were present in both stem and roots as glucose, but within the limits of the sun- flower portion they accumulated as starch, while within the limits of the arti- choke portion they accumulated as inulin. The operation of transplantation is successful only when closely related species are involved, as may be understood from the foregoing discussion (page 292) of hormones and of the chemical differences between the metabolic sub- stances of forms not closely Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Palladin, Vladimir Ivanovich, 1859-1922; Livingston, Burton Edward, 1875-; Hopping, Aleita, 1890-. Philadelphia, P. Blakiston's Son & Co
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