Regeneration in Mutilated Seedlings

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Abstract
Regeneration of mutilated seedlings was tested on moist filter paper in petri dishes, and on agar made with Shive''s solution. Regeneration took place more rapidly on Shive''s agar than on the moist paper. Rooting of excised cotyledons was observed in 41 plants belonging to 19 families. Basal halves of cotyledons rooted almost as rapidly as whole cotyledons, and apical halves were rooted in 10 spp. Right and left halves of cotyledons formed roots in 16 spp., and smaller fragments of cotyledons rooted in 4. Shoots were developed on excised cotyledons in 22 spp. Seedlings, severed just above the root collar, formed new roots at the bases of the severed hypocotyls in 35 plants belonging to 16 families. Hypocotyls severed below the cotyledons and above the root collar formed roots in 4 spp., and shoots in 4. In seedlings from which the cotyledons were removed, the plumules failed to develop. Cotyledons and hypocotyls alike, form roots in either light or darkness, but some spp. develop best in the light, and others in the dark. The cotyledons and the hypocotyls of a given species may react differently to light.

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