POLLEN-STERILE HYBRID WHEAT, PROCESS FOR ITS PREPARATION BASED ON ABILITY OF GENIC MAINTAINING OF POLLEN-STERILE PARENTAL LINE WHICH IS READILY AND STEADY PROPAGATED

摘要

The present invention provides a method for the production of hybrid wheat based on the ability to stably maintaining a genic male-sterile female parental line of common and durum wheat It also provides a male-sterile female line homozygous for a recessive male-sterility allele and for a dominant pollen-killing allele, and a maintainer line which is readily and stably propagated. The maintainer line is isogenic to the female line but has an alien engineered chromosome carrying a dominant male-fertility allele that restores fertility to the maintainer line, a recessive pollen-killing allele that is susceptible to the killing effect of the native pollen killer thus preventing transmission of this chromosome to the female line, and one or more selectable markers that facilitate the maintenance of the maintainer itself. The invention also provides procedures for converting any desired cultivar into male-sterile female line and into a maintainer line.