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- Title
Effective Pollen-Fertility Restoration Is the Basis of Hybrid Rye Production and Ergot Mitigation.
- Authors
Miedaner, Thomas; Korzun, Viktor; Wilde, Peer
- Abstract
Hybrid rye breeding leads to considerably higher grain yield and a higher revenue to the farmer. The basis of hybrid seed production is the CMS-inducing Pampa (P) cytoplasm derived from an Argentinean landrace and restorer-to-fertility (Rf) genes. European sources show an oligogenic inheritance, with major and minor Rf genes, and mostly result in low-to-moderate pollen-fertility levels. This results in higher susceptibility to ergot (Claviceps purpurea) because rye pollen and ergot spores are in strong competition for the unfertilized stigma. Rf genes from non-adapted Iranian primitive rye and old Argentinean cultivars proved to be most effective. The major Rf gene in these sources was localized on chromosome 4RL, which is also a hotspot of restoration in other Triticeae. Marker-based introgression into elite rye materials led to a yield penalty and taller progenies. The Rfp1 gene of IRAN IX was fine-mapped, and two linked genes of equal effects were detected. Commercial hybrids with this gene showed a similar low ergot infection when compared with population cultivars. The task of the future is to co-adapt these exotic Rfp genes to European elite gene pools by genomic-assisted breeding.
- Subjects
IRAN; HEREDITY; RYE; WHEAT breeding; INTROGRESSION (Genetics); GRAIN yields; SEED industry; CHROMOSOMES
- Publication
Plants (2223-7747), 2022, Vol 11, Issue 9, p1115
- ISSN
2223-7747
- Publication type
Article
- DOI
10.3390/plants11091115