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Chinierism in bean (Phascolus vulgaris L) plants grown from irradiated seeds

Hélio M. Barbosa^I; José Sebastião de P. Sena^I,II

^IDepartamento de Biologia Geral, Universidade Federal de Viçosa, 36570 Viçosa, MG, Brasil. Send correspondence to H.M.B.
^IIPresent address: Caixa Postal 72, Imperatriz, MA, Brasil

ABSTRACT

Seeds of the common bean (Phaseolus vulgaris L.) with ca. 13% moisture were treated with 0 (control), 6, 12, 18, 24, and 30 krads of gamma rays and planted in the field. Single plant progenies were grown in the M₂ generation, except for the 18=krad treatment. In this case, individual branch progenies were grown. The scoring of chlorophyll mutations in the M₂ generation led to the conclusion that the M₁ bean plant is derived from about two to nine initial cells of the embryo. More than one cell is probably involved in a primary branch formation. Additional data are needed to decide whether or not the mutated sectors are randomly distributed on the M₁ plant.

Keywords: Chimerism; Phaseolus vulgaris; Irradiated seeds.

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