How Hybrid Breakdown Can Be Handled in Rice Crossbreeding?

Matsubara, Kazuki

doi:10.3389/fpls.2020.575412

Cited by 9 publications

(13 citation statements)

References 42 publications

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“…, 2009; Bomblies et al. , 2007; Matsubara, 2020). Of these types, reciprocal silencing of duplicated genes was reported to be the first and the commonly acceptable theoretical genetic basis for HB (Lynch and Force, 2000; Werth and Windham, 1991).…”

Section: Introductionmentioning

confidence: 99%

“…However, because of the detrimental effects of the vast majority of mutations, duplication of gene pairs is usually thought to cause the silencing of one member (Lynch and Force, 2000; Walsh, 1995; Watterson, 1983). Therefore, during evolution, different subspecies may generate genes with disparate functions, and the genomic recombination event leads to these sites through the hybridization process, which in turn causes the occurrence of hybrid incompatibility (Lynch and Force, 2000; Matsubara, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Studies in Arabidopsis and rice have provided a relatively clear perspective on the underlying mechanisms of HB (Matsubara et al, 2015;Vaid and Laitinen, 2019). The autoimmune response and reciprocal silencing of duplicated genes are thought to be the main types of Bateson-Dobzhansky-Muller incompatibility (Bikard et al, 2009;Bomblies et al, 2007;Matsubara, 2020). Of these types, reciprocal silencing of duplicated genes was reported to be the first and the commonly acceptable theoretical genetic basis for HB (Lynch and Force, 2000;Werth and Windham, 1991).…”

Section: Introductionmentioning

confidence: 99%

“…Hybridization between divergent subspecies is considered the driver of uniquely advantageous traits. However, reproductive barriers prevent gene flow and reduce hybrid fitness in F 1 and/or later generations (Kubo and Yoshimura, 2002;Matsubara, 2020). Hybrid breakdown (HB) is a common type of reproductive barrier and has been observed in both plants and animals.…”

Section: Introductionmentioning

confidence: 99%

“…Hybrid breakdown (HB) is a common type of reproductive barrier and has been observed in both plants and animals. HB causes weakness and/or sterility in F 2 and later progenies (Matsubara, 2020). A universally accepted genetic mechanism of HB is commonly called Bateson-Dobzhansky-Muller incompatibility, which states that the synergistic interaction of functionally divergent genes from different parents reduces fitness in progenies (Rieseberg and Willis, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Non‐functional GoFLA19s are responsible for the male sterility caused by hybrid breakdown in cotton (Gossypium spp.)

et al. 2021

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SUMMARY Hybrid breakdown (HB) functions as a common reproductive barrier and reduces hybrid fitness in many species, including cotton. However, the related genes and the underlying genetic mechanisms of HB in cotton remain unknown. Here, we found that the photosensitive genetic male sterile line CCRI9106 was a hybrid progeny of Gossypium hirsutum and Gossypium barbadense and probably a product of HB. Fine mapping with F2s (CCRI9106 × G. hirsutum/G. barbadense lines) identified a pair of male sterility genes GoFLA19s (encoding fasciclin‐like arabinogalactan family protein) located on chromosomes A12 and D12. Crucial variations occurring in the fasciclin‐like domain and the arabinogalactan protein domain were predicted to cause the non‐functionalization of GbFLA19‐D and GhFLA19‐A. CRISPR/Cas9‐mediated knockout assay confirmed the effects of GhFLA19s on male sterility. Sequence alignment analyses showed that variations in GbFLA19‐D and GhFLA19‐A likely occurred after the formation of allotetraploid cotton species. GoFLA19s are specifically expressed in anthers and contribute to tapetal development, exine assembly, intine formation, and pollen grain maturation. RNA‐sequencing and quantitative reverse transcriptase–polymerase chain reaction analyses illustrated that genes related to these biological processes were significantly downregulated in the mutant. Our research on male sterility genes, GoFLA19s, improves the understanding of the molecular characteristics and evolutionary significance of HB in interspecific hybrid breeding.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non‐functional GoFLA19s are responsible for the male sterility caused by hybrid breakdown in cotton (Gossypium spp.)

et al. 2021

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Improving hybrid rice breeding programs via stochastic simulations: number of parents, number of hybrids, tester update, and genomic prediction of hybrid performance

Fritsche-Neto,

Ali,

De Asis

et al. 2023

Theor Appl Genet

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Key message Schemes that use genomic prediction outperform others, updating testers increases hybrid genetic gain, and larger population sizes tend to have higher genetic gain and less depletion of genetic variance Abstract One of the most common methods to improve hybrid performance is reciprocal recurrent selection (RRS). Genomic prediction (GP) can be used to increase genetic gain in RRS by reducing cycle length, but it is also possible to use GP to predict single-cross hybrid performance. The impact of the latter method on genetic gain has yet to be previously reported. Therefore, we compared via stochastic simulations various phenotypic and genomics-assisted RRS breeding schemes which used GP to predict hybrid performance rather than reducing cycle length, which allows minimal changes to traditional breeding schemes. We also compared three breeding sizes scenarios that varied the number of genotypes crossed within heterotic pools, the number of genotypes crossed between heterotic pools, the number of hybrids evaluated, and the number of genomic predicted hybrids. Our results demonstrated that schemes that used genomic prediction of hybrid performance outperformed the others for the average interpopulation hybrid population and the best hybrid performance. Furthermore, updating the testers increased hybrid genetic gain with phenotypic RRS. As expected, the largest breeding size tested had the highest rates of genetic improvement and the lowest decrease in additive genetic variance due to the drift. Therefore, this study demonstrates the usefulness of single-cross prediction, which may be easier to implement than rapid-cycling RRS and cyclical updating of testers. We also reiterate that larger population sizes tend to have higher genetic gain and less depletion of genetic variance.

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Genetics of chilling response at early growth stage in rice: a recessive gene for tolerance and importance of acclimation

Baruah,

Bannai,

Meija

et al. 2023

AoB PLANTS

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Low-temperature adaptation in rice is mediated by the ability of a genotype to tolerate chilling temperatures. A genetic locus on chromosome 11 was analyzed for chilling tolerance at the plumule stage in rice. The tolerant allele of A58, a japonica landrace in Japan, was inherited as a recessive gene (ctp-1A58), whereas the susceptible alleles from wild rice (Ctp-1W107) and modern variety (Ctp-1HY) were the dominant genes. Another recessive tolerant allele (ctp-1Silewah) was found in a tropical japonica variety (Silewah). Fine-mapping revealed that a candidate gene for the ctp-1 locus encoded a protein similar to the nucleotide-binding domain and leucine-rich repeat (NLR) protein, in which frameshift mutation by a 73 bp-deletion might confer chilling tolerance in ctp-1A58. Analysis of near isogenic lines demonstrated that ctp-1A58 imparted tolerance effects only at severe chilling temperatures of 0.5 °C and 2 °C, both at plumule and seedling stages. Chilling acclimation treatments at wide range of temperatures (8 °C–16 °C) for 72 h concealed the susceptible phenotype of Ctp-1W107 and Ctp-1HY. Furthermore, short-term acclimation treatment of 12 h at 8 °C was enough to be fully acclimated. These results suggest that the NLR gene induces susceptible response upon exposure to severe chilling stress, however, another interacting gene(s) for acclimation response could suppress the maladaptive phenotype caused by the Ctp-1 allele. This study provides new insights for adaptation and breeding of rice in a low-temperature environment.

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How Hybrid Breakdown Can Be Handled in Rice Crossbreeding?

Cited by 9 publications

References 42 publications

Non‐functional GoFLA19s are responsible for the male sterility caused by hybrid breakdown in cotton (Gossypium spp.)

Non‐functional GoFLA19s are responsible for the male sterility caused by hybrid breakdown in cotton (Gossypium spp.)

Improving hybrid rice breeding programs via stochastic simulations: number of parents, number of hybrids, tester update, and genomic prediction of hybrid performance

Genetics of chilling response at early growth stage in rice: a recessive gene for tolerance and importance of acclimation

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