RFLP MAPPING OF THE BARLEY HOMEOTIC MUTANT LAX-A

The lax-a homeotic mutant of barley has flowers in which lodicules are replaced by stamens (giving five stamens per flower), RFLP mapping of an F-2 population from a Bonus lax-a(1) x H. spontaneum cross showed that the mutation was on the short arm of chromosome 7(5H), closely li nked to the centromere. An additional F-2 population was used to show that the lax-a mutation gave the five-stamen phenotype in all flowers of 6-rowed spikes and that hoods were elevated and reduced in size in lax-a/Hooden double-mutant plants.