Abstract
In crosses between genetically divergent parents, traits such as weakness and sterility often segregate in later generations. This hybrid breakdown functions as a reproductive barrier and reduces selection efficiency in crossbreeding. Here, I provide an overview of hybrid breakdown in rice crosses and discuss ways to avoid and mitigate the effects of hybrid breakdown on rice crossbreeding, including genomics-assisted breeding.
Highlights
Edited by: Ryo Fujimoto, Kobe University, JapanReviewed by: Ling Jiang, Nanjing Agricultural University, China Tomohiko Kazama, Kyushu University, JapanSpecialty section: This article was submitted toPlant Breeding, a section of the journal Frontiers in Plant ScienceReceived: 23 June 2020 Accepted: 30 September 2020Published: 20 October 2020Citation: Matsubara K (2020) How Hybrid Breakdown Can Be Handled in RiceCrossbreeding? Front
Reduced hybrid viability and/or fertility segregating in F2 or later generations are referred to as hybrid breakdown (HB), in which recessive alleles are necessarily associated
I believe that HB is a convenient classification for reproductive barriers because it implies their underlying genetic basis
Summary
Edited by: Ryo Fujimoto, Kobe University, JapanReviewed by: Ling Jiang, Nanjing Agricultural University, China Tomohiko Kazama, Kyushu University, JapanSpecialty section: This article was submitted toPlant Breeding, a section of the journal Frontiers in Plant ScienceReceived: 23 June 2020 Accepted: 30 September 2020Published: 20 October 2020Crossbreeding? Front. Rice (Oryza species) is a model crop, the current understanding of the genetic basis of HB remains limited in this species, probably because HB is not a reproductive barrier in F1 hybrids, in which a higher grain production is expected compared with the parental inbred lines, and probably because inferior plants that segregate in F2 and later generations can be selected out based on the phenotype from the breeding population.
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