We investigated the effect of multiple susceptibility alleles at a single disease locus on the statistical power of a likelihood ratio test to detect association between alleles at a marker locus and a disease phenotype in a case-control design. Using simplifying assumptions to obtain the joint frequency distribution of marker and disease locus alleles, we present numerical results that illustr...

Narrow genetic variability may lead to genetic vulnerability of field crops against biotic and abiotic stresses which can cause yield reduction. In this study a set of 37 wheat microsatellite markers linked with identified QTLs for salinity tolerance were used for the assessment of genetic diversity for salinity in 30 promising lines of hexaploid bread wheat (Triticum aestivum L.). A total of 4...

In many plant species, self-incompatibility (SI) is genetically controlled by a single multiallelic S locus. Previous analysis of S alleles in the Solanaceae, in which S locus ribonucleases (S RNases) are responsible for stylar expression of SI, has demonstrated that allelic diversity predated speciation within this family. To understand how allelic diversity has evolved, we investigated the mo...

The unsolved problem of how the pollen and pistil components of angiosperm self-incompatibility (SI) are inherited has a long history (Lewis, 1960). A recent paper provides evidence, based on transgenic experiments in Solanum chacoense , that a single amino acid difference between proteins encoded by two very similar SI-specifying ( S ) alleles can result in plants that reject the pollen of bot...

almond is one of the most important prunus species. most almond cultivars and genotypes are self-incompatible and some others are cross-incompatible. however, recently self-incompatible cultivars developed by breeding are available. therefore self-incompatible cultivars for pollination, fertilization and production require compatible pollen of other cultivars. in this regard the study of pollen...

On the basis of interallelic recombination frequencies measured in diallelic crosses of the 5 amylose-extender alleles in maize, ae, B I , B3, M2 and i1, it was possible to construct a unique linear genetic map ordering all 5 alleles within the locus. The reciprocal diallelic crosses each gave comparable frequency estimates. The relative order is ae, i l , B3, BY, A42 or the reverse. Even thoug...

A recent investigation found evidence that the transition of Arabidopsis thaliana from ancestral self-incompatibility (SI) to full self-compatibility occurred very recently and suggested that this occurred through a selective fixation of a nonfunctional allele (PsiSCR1) at the SCR gene, which determines pollen specificity in the incompatibility response. The main evidence is the lack of polymor...