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Plant and Cell Physiology, 1962, Vol. 3, No. 3 275-284
© 1962

Article

CHARACTERISTICS OF X-RAY-INDUCED ABERRANTS OF LEMNA PERPUSILLA 6746

HERBERT B. POSNER1

Department of Botany, J. W. Gibbs Research Laboratory, Yale University New Haven, Conn., U. S. A.

Seven aberrant strains have been produced by x-irradiation of wild-type Lemna perpusilla 6746. A quantitative description of five of the aberrants is given.

Four strains (98-H, 99-B-1, 1073 and 5104) produce very few seeds and these always lack embryos. Strain 7130 also produces few seeds but these are viable.

Strain 98-H grows slowly and on high sucrose concentrations produces high numbers of fronds per colony.

Strain 7130 and wild-type do not differ with respect either to growth rate or radiosensitivity.

Strains 1073 and 5104 grow slightly slower than wild-type and are much more radiosensitive. In addition, strain 1073 is inefficient in maintaining a definite frond sequence, and, under low-intensity light or in complete darkness, its flowering is markedly reduced.

1 Present address: Department of Biology, Brookhaven National Laboratory, Upton, L. I., New York.

(Received June 18, 1962; )
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