Genetic diversity among East Asian accessions of the barley core collection as revealed by six isozyme loci

Population and multilocus isozyme structures in a barley landrace

“…Ethiopia, Syria, Tibet) have the capacity to support more rare alleles and multilocus genotypes (Dai and Zhang, 1989;Demissie and Bjørnstad, 1997;Parzies et al, 2004) than accessions conserved ex situ. This study identified a relatively lower (22.2%) portion of rare alleles in a small number of accessions in this landrace as compared to higher proportions of rare alleles (28.0-38.5%), albeit in much larger landrace collections (Liu et al, 1999(Liu et al, , 2000. The inclusion of such rare, locally distributed alleles will be very dependent on stochastic effects and such alleles will only be included if the sample size is very large.…”

“…Zhang et al, 1994;Liu et al, 1999), larger values of population differentiation were reported for barley landraces, as compared to modern cultivars. The seemingly very small level of population differentiation in these cases (e.g.…”

“…In addition, such knowledge is helpful to geneticists in managing plant genetic resources and it provides information for designing sampling protocols (Liu et al, 1999(Liu et al, , 2000.…”

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“…Ideally, a core collection should represent most if not all diversity in the entire collection with a minimum or no redundancy (Tohme et al, 1995). With this aim in Europe core collections have been developed in different crops (Bennett et al, 2000;Liu et al, 2000;Polignano et al, 1999;Swiecicki et al, 2000). Our objectives were to: (i) determine patterns of diversity among the common bean landraces from the Iberian Peninsula and (ii) form a core collection.…”

Genetic profiles and diversity of Baltic spring barley material

“…Eight isozyme loci where characterised. The designation of alleles at the Aco-1 and Pgd-2 loci followed that of Nielsen and Johansen (1986), at Est-1; Est-2, Est-4 and Est-5 loci Hvid followed Nielsen (1977) and at Aco-2 locus - Liu et al (1999). …”