Variation of esterase isozyme genotypes in a pedigree of Japanese two-rowed barley.

Abstract

In Japanese two-rowed barley varieties, there are 4 genotypes for esterase isozymes at 3 loci (Est1' Est2 and Est4) which are closely linked as a gene block at the terminal of the long arm of chromosome 3. The genotypes are Pr-Fr-Su, Ca-Dr-Nz, Ca-Fr-Su and Ca-Fr-At which consist of different allelic c.ombinations at 3 loci, Est1-Est2-Est4, respectively, and most of the varieties have either Pr-Fr-Su or Ca-Dr-Nz genotype. While the varieties which are old or introduced ones in the early 20 century, for instance, Golden Melon, have mainly the Ca-Dr-Nz genotype, the Pr-Fr-Su genotypes are frequently found in improved varieties. Thus, the varieties with the Pr-Fr-Su genotype which was derived from Prior occupy the major acreage of two-rowed barley cultivation at present (Figs. 2 and 3).