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Open AccessArticle

Selective Elimination of Parental Chromatin from Introgression Cultivars of xFestulolium (Festuca × Lolium)

Institute of Experimental Botany, Centre of the Region Haná for Biotechnological and Agricultural Research, Šlechtitelů 31, 78371 Olomouc, Czech Republic
Department of Botany, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic, [email protected]
Author to whom correspondence should be addressed.
Sustainability 2019, 11(11), 3153;
Received: 13 May 2019 / Revised: 29 May 2019 / Accepted: 3 June 2019 / Published: 4 June 2019
(This article belongs to the Special Issue Grass Traits for Ecosystem Service and Sustainability)
Alien chromosome introgressions can be used to introduce beneficial traits from one species into another. However, exploitation of the introgressions in breeding requires proper transmission of introgressed segments to consecutive generations. In xFestulolium hybrids chromosomes of Festuca and Lolium readily pair and recombine. This opens a way for introgression of traits (e.g., abiotic and biotic stress resistance) from Festuca into elite Lolium cultivars. However, retention of Festuca chromatin in xFestulolium is uncertain as several studies indicated its gradual elimination over generations of sexual reproduction. Here we investigated genome composition in two subsequent generations of four introgression xFestulolium (F. pratensis × L. multiflorum) cultivars using genomic in situ hybridization. We observed about 27–32% elimination of Festuca chromatin in a single round of multiplication. At this pace, Festuca chromatin would be completely eliminated in about four generations of seed multiplication. On the other hand, we observed that it is possible to increase the proportion of Festuca chromatin in the cultivars by proper selection of mating plants. Nevertheless, once selection is relaxed, the first round of the seed multiplication reverts the genome composition back to the Lolium type. Thus, it seems that amphiploid forms of xFestulolium with relatively stable hybrid genomes may be more promising material for future breeding than introgression lines. View Full-Text
Keywords: genome dominance; ryegrass; fescue; hybrid; grass; recombination genome dominance; ryegrass; fescue; hybrid; grass; recombination
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Kopecký, D.; Horáková, L.; Duchoslav, M.; Doležel, J. Selective Elimination of Parental Chromatin from Introgression Cultivars of xFestulolium (Festuca × Lolium). Sustainability 2019, 11, 3153.

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