LBN Cytoplasm

摘要

Most of the corn in the United States is grown from hybrid seed. The production of hybrid seeds necessitates the emasculation of the desired female parent plant. If this emasculation is carried out by hand, then it becomes a major cost factor. One method to overcome these costs is to obtain inbred lines of corn which have stable cytoplasmic male sterility. Such cytoplasmic male sterility should remain stable when the genome of the inbred line is replaced by the genomes of other inbred lines by backcrossing. Three major groups of cytoplasmic male sterility (C, T and S) have been extensively studied. In the past the cms S-type has not been extensively utilized in the production of hybrid corn seed because cms S-cytoplasms do not show stable male sterility and also in some backgrounds have a high rate of genetic reversion to male fertility. We describe here the production of a novel stable cytoplasmic male sterile strain (LBN) which remains stably sterile in combination with a large number of inbred corn lines. Some unusual features of this LBN-cytoplasm are described and discussed.