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This article comprises our final remarks on the phenotypic effects of alien plasmons on common wheat. Twenty-one vegetative, reproductive, and seed characters of 551 alloplasmic lines of 12 common wheat genotypes with 46 alloplasmons, and as the control, their euplasmic lines were investigated. Effects of genotype, plasmon, and their interaction had high statistical significance for all the characters investigated, whereas phenotypic variations attributable to the alien plasmons were relatively small. Individual plasmon types are characterized by their primary effects on 21 characters. Genotype x plasmon effects on two representative characters, heading date and plant height, are described in detail. Cluster and principal component analyses of the phenotypic effects of the 47 plasmons yielded 22 groups. The relationships between these phenotype-based groups and those defined by molecular differences in organellar genomes were examined. A significant correlation was found with some explainable discrepancies. For efficient plasmon identification, use of six of the present 12 genotypes is proposed. The key for plasmon classification is provided. Our findings indicate that alien plasmons may be of limited value in future wheat breeding, but that the plasmon diversity that exists in Triticum and Aegilops species is of great significance for understanding the evolution of these genera.

genes and genetic systems

Plasmon analysis of Triticum(wheat) and Aegilops. 2. Characterization and classification of 47 plasmons based on their effects on common wheat phenotype.