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He H, Shiragaki K, Tezuka T. Understanding and overcoming hybrid lethality in seed and seedling stages as barriers to hybridization and gene flow. FRONTIERS IN PLANT SCIENCE 2023; 14:1219417. [PMID: 37476165 PMCID: PMC10354522 DOI: 10.3389/fpls.2023.1219417] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 06/20/2023] [Indexed: 07/22/2023]
Abstract
Hybrid lethality is a type of reproductive isolation barrier observed in two developmental stages, hybrid embryos (hybrid seeds) and hybrid seedlings. Hybrid lethality has been reported in many plant species and limits distant hybridization breeding including interspecific and intergeneric hybridization, which increases genetic diversity and contributes to produce new germplasm for agricultural purposes. Recent studies have provided molecular and genetic evidence suggesting that underlying causes of hybrid lethality involve epistatic interaction of one or more loci, as hypothesized by the Bateson-Dobzhansky-Muller model, and effective ploidy or endosperm balance number. In this review, we focus on the similarities and differences between hybrid seed lethality and hybrid seedling lethality, as well as methods of recovering seed/seedling activity to circumvent hybrid lethality. Current knowledge summarized in our article will provides new insights into the mechanisms of hybrid lethality and effective methods for circumventing hybrid lethality.
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Affiliation(s)
- Hai He
- School of Agriculture, Sun Yat-sen University, Shenzhen, China
| | - Kumpei Shiragaki
- Laboratory of Plant Breeding and Genetics, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan
| | - Takahiro Tezuka
- Laboratory of Breeding and Genetics, Graduate School of Agriculture, Osaka Metropolitan University, Sakai, Osaka, Japan
- Education and Research Field, School of Agriculture, Osaka Metropolitan University, Sakai, Osaka, Japan
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Mino M, Tezuka T, Shomura S. The hybrid lethality of interspecific F 1 hybrids of Nicotiana: a clue to understanding hybrid inviability-a major obstacle to wide hybridization and introgression breeding of plants. MOLECULAR BREEDING : NEW STRATEGIES IN PLANT IMPROVEMENT 2022; 42:10. [PMID: 37309322 PMCID: PMC10248639 DOI: 10.1007/s11032-022-01279-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 01/23/2022] [Indexed: 06/14/2023]
Abstract
Reproductive isolation poses a major obstacle to wide hybridization and introgression breeding of plants. Hybrid inviability in the postzygotic isolation barrier inevitably reduces hybrid fitness, consequently causing hindrances in the establishment of novel genotypes from the hybrids among genetically divergent parents. The idea that the plant immune system is involved in the hybrid problem is applicable to the intra- and/or interspecific hybrids of many different taxa. The lethality characteristics and expression profile of genes associated with the hypersensitive response of the hybrids, along with the suppression of causative genes, support the deleterious epistatic interaction of parental NB-LRR protein genes, resulting in aberrant hyper-immunity reactions in the hybrid. Moreover, the cellular, physiological, and biochemical reactions observed in hybrid cells also corroborate this hypothesis. However, the difference in genetic backgrounds of the respective hybrids may contribute to variations in lethality phenotypes among the parental species combinations. The mixed state in parental components of the chaperone complex (HSP90-SGT1-RAR1) in the hybrid may also affect the hybrid inviability. This review article discusses the facts and hypothesis regarding hybrid inviability, alongside the findings of studies on the hybrid lethality of interspecific hybrids of the genus Nicotiana. A possible solution for averting the hybrid problem has also been scrutinized with the aim of improving the wide hybridization and introgression breeding program in plants.
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Affiliation(s)
- Masanobu Mino
- Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, 1-5 Hangi-cho, Shimogamo, Sakyo-ku, Kyoto, 606-8522 Japan
- Present Address: Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku Sakai, Osaka, 599-8531 Japan
| | - Takahiro Tezuka
- Present Address: Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku Sakai, Osaka, 599-8531 Japan
| | - Sachiko Shomura
- Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, 1-5 Hangi-cho, Shimogamo, Sakyo-ku, Kyoto, 606-8522 Japan
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Tezuka T, Kitamura N, Imagawa S, Hasegawa A, Shiragaki K, He H, Yanase M, Ogata Y, Morikawa T, Yokoi S. Genetic Mapping of the HLA1 Locus Causing Hybrid Lethality in Nicotiana Interspecific Hybrids. PLANTS 2021; 10:plants10102062. [PMID: 34685871 PMCID: PMC8539413 DOI: 10.3390/plants10102062] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 09/27/2021] [Accepted: 09/28/2021] [Indexed: 12/27/2022]
Abstract
Hybrid lethality, a postzygotic mechanism of reproductive isolation, is a phenomenon that causes the death of F1 hybrid seedlings. Hybrid lethality is generally caused by the epistatic interaction of two or more loci. In the genus Nicotiana, N. debneyi has the dominant allele Hla1-1 at the HLA1 locus that causes hybrid lethality in F1 hybrid seedlings by interaction with N. tabacum allele(s). Here, we mapped the HLA1 locus using the F2 population segregating for the Hla1-1 allele derived from the interspecific cross between N. debneyi and N. fragrans. To map HLA1, several DNA markers including random amplified polymorphic DNA, amplified fragment length polymorphism, and simple sequence repeat markers, were used. Additionally, DNA markers were developed based on disease resistance gene homologs identified from the genome sequence of N. benthamiana. Linkage analysis revealed that HLA1 was located between two cleaved amplified polymorphic sequence markers Nb14-CAPS and NbRGH1-CAPS at a distance of 10.8 and 10.9 cM, respectively. The distance between these markers was equivalent to a 682 kb interval in the genome sequence of N. benthamiana.
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Affiliation(s)
- Takahiro Tezuka
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (N.K.); (K.S.); (H.H.); (M.Y.); (Y.O.); (T.M.); (S.Y.)
- Education and Research Field, College of Life, Environment and Advanced Sciences, Osaka Prefecture University, Osaka 599-8531, Japan
- Correspondence:
| | - Naoto Kitamura
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (N.K.); (K.S.); (H.H.); (M.Y.); (Y.O.); (T.M.); (S.Y.)
| | - Sae Imagawa
- School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (S.I.); (A.H.)
| | - Akira Hasegawa
- School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (S.I.); (A.H.)
| | - Kumpei Shiragaki
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (N.K.); (K.S.); (H.H.); (M.Y.); (Y.O.); (T.M.); (S.Y.)
| | - Hai He
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (N.K.); (K.S.); (H.H.); (M.Y.); (Y.O.); (T.M.); (S.Y.)
| | - Masanori Yanase
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (N.K.); (K.S.); (H.H.); (M.Y.); (Y.O.); (T.M.); (S.Y.)
| | - Yoshiyuki Ogata
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (N.K.); (K.S.); (H.H.); (M.Y.); (Y.O.); (T.M.); (S.Y.)
| | - Toshinobu Morikawa
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (N.K.); (K.S.); (H.H.); (M.Y.); (Y.O.); (T.M.); (S.Y.)
| | - Shuji Yokoi
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka 599-8531, Japan; (N.K.); (K.S.); (H.H.); (M.Y.); (Y.O.); (T.M.); (S.Y.)
- Education and Research Field, College of Life, Environment and Advanced Sciences, Osaka Prefecture University, Osaka 599-8531, Japan
- Bioeconomy Research Institute, Research Center for the 21st Century, Osaka Prefecture University, Osaka 599-8531, Japan
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