Sexual dimorphism and the effect of wild introgressions on recombination in cassava (Manihot esculenta Crantz) breeding germplasm.
| Autor: | Chan AW; Section of Plant Breeding and Genetics, School of Integrative Plant Sciences, Cornell University, Ithaca, NY 14853, USA., Villwock SS; Section of Plant Breeding and Genetics, School of Integrative Plant Sciences, Cornell University, Ithaca, NY 14853, USA., Williams AL; Department of Biological Statistics and Computational Biology, Cornell University, Ithaca, NY 14853, USA., Jannink JL; RW Holley Center for Agriculture and Health, United States Department of Agriculture-Agricultural Research Service, School of Integrative Plant Sciences, Cornell University, Ithaca, NY 14853, USA. |
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| Jazyk: | angličtina |
| Zdroj: | G3 (Bethesda, Md.) [G3 (Bethesda)] 2022 Jan 04; Vol. 12 (1). |
| DOI: | 10.1093/g3journal/jkab372 |
| Abstrakt: | Recombination has essential functions in meiosis, evolution, and breeding. The frequency and distribution of crossovers dictate the generation of new allele combinations and can vary across species and between sexes. Here, we examine recombination landscapes across the 18 chromosomes of cassava (Manihot esculenta Crantz) with respect to male and female meioses and known introgressions from the wild relative Manihot glaziovii. We used SHAPEIT2 and duoHMM to infer crossovers from genotyping-by-sequencing data and a validated multigenerational pedigree from the International Institute of Tropical Agriculture cassava breeding germplasm consisting of 7020 informative meioses. We then constructed new genetic maps and compared them to an existing map previously constructed by the International Cassava Genetic Map Consortium. We observed higher recombination rates in females compared to males, and lower recombination rates in M. glaziovii introgression segments on chromosomes 1 and 4, with suppressed recombination along the entire length of the chromosome in the case of the chromosome 4 introgression. Finally, we discuss hypothesized mechanisms underlying our observations of heterochiasmy and crossover suppression and discuss the broader implications for plant breeding. (© The Author(s) 2021. Published by Oxford University Press on behalf of Genetics Society of America.) |
| Databáze: | MEDLINE |
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