. Contributions from the Laboratory of Plant Genetics. Studies of Teratological Phenomena. 79 grown under optimum conditions. All the plants thus produced were in every case fully fasciated, almost, if not quite as much as the original grandparent.' The slight variability of the character was therefore ascribed by Lock to environmental influences. Fi plants grown at the Bussey Institution from seed ("Irish Mummy" X "Chinese Native") fur- nished by Darbishire, gave ab- solute dominance of the normal condition. 2. Zea Mays L. De Vries, East and Hayes, Emerson and Hus have all
. Contributions from the Laboratory of Plant Genetics. Studies of Teratological Phenomena. 79 grown under optimum conditions. All the plants thus produced were in every case fully fasciated, almost, if not quite as much as the original grandparent.' The slight variability of the character was therefore ascribed by Lock to environmental influences. Fi plants grown at the Bussey Institution from seed ("Irish Mummy" X "Chinese Native") fur- nished by Darbishire, gave ab- solute dominance of the normal condition. 2. Zea Mays L. De Vries, East and Hayes, Emerson and Hus have all experimented with races of maize which produce fas- ciated ears. De Vries (1894) finds this cha- racter to belong to the "eversporting" class. Cultures that were grown by him contained 40 per cent abnormal plants. Hus and Murdock (1911) secured results similar to those ob- tained by de Vries. East and Hayes (1911) found an ear of this fasciated type in a culture of field corn which had been selfed for three generations. The seed was grown aud 34 abnormal and 12 normal-eared plants were Fig- 8. Pisum sativum umbellatum. produced. Another fasciated ear (After Gerarde.) appeared in the F2 generation of a cross between two normal strains, one of which had been recorded as throwing abnormal-eared plants. This ear produced 62 abnormals: 23 normals. The normals appeared to breed true, and the abnormal condition is regarded by them to be dominant. The character itself fluctuated between very abnormal and (superficially) almost normal states. The most extensive investigations on the inheritance of fasciation in maize have been made by Emerson (1912). In his cultures, the degree of fasciation varies much even between the different ears of a single plant, some ears being very broad-tipped, while others are only 3. Pisum umbellatum. Tufted or Scottish Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabilit
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