Open AccessGenetic control of cellular differentiation in Ulva mutabilis II. Induced chimeras
Author(s) -
FJELD ASBJØRN
Publication year - 1971
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1971.tb02418.x
Subject(s) - biology , mutant , gametophyte , gene , multicellular organism , chimera (genetics) , ploidy , microbiology and biotechnology , cell , genetics , botany , pollen
Mutants were induced by ultraviolet light in haploid gametophyte germlings of the haplodiplontic multicellular alga Ulva mutabilis. When treated, they were from 2 to 10 days old and consisted of one cell (2 days old) to a few hundred cells (10 days old). Plants consisting exclusively of mutant cells as well as genetical chimeras consisting partly of mutant and partly of wild type cells were obtained. The frequencies of chimeras changed with the age of the irradiated germlings in a way characteristic of individual groups of genes. Chimeras involving mutations in a specific group of genes were confined to the 2‐cell stage of development. These genes are assumed to be active around the 2‐cell stage because mutations in genes which are active during a certain developmental period, will be expressed in the same generation only if the mutational event takes place before or within the active period.