Genomic structure of the sweet potato and hexaploids in Ipomoea trifida(H.B.K.) Don.

Shiotani, Itaru; Kawase, Tsuneo

doi:10.1270/jsbbs1951.39.57

Cited by 60 publications

(32 citation statements)

References 8 publications

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“…5). We showed that even though sweetpotato origin could be traced to an interspecific hybridization as suggested by some studies 17,24,48,49 , its inheritance pattern is vastly autopolyploid-like and random chromosome pairing would enable recombination between sub-genomes across generations.…”

Section: Discussionmentioning

confidence: 77%

Unraveling the hexaploid sweetpotato inheritance using ultra-dense multilocus mapping

Mollinari

Olukolu

Pereira

et al. 2019

Preprint

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16The hexaploid sweetpotato (Ipomoea batatas (L.) Lam., 2n = 6x = 90) is an important staple 17 food crop worldwide and has a vital role in alleviating famine in developing countries. Due to its 18 high ploidy level, genetic studies in sweetpotato lag behind major diploid crops significantly. We 19 built an ultra-dense multilocus integrated genetic map and characterized the inheritance system 20 in a sweetpotato full-sib family using our newly implemented software, MAPpoly. The resulting 21 genetic map revealed 96.5% collinearity between I. batatas and its diploid relative I. trifida. We 22 computed the genotypic probabilities across the whole genome for all individuals in the mapping 23

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Section: Discussionmentioning

confidence: 77%

Unraveling the hexaploid sweetpotato inheritance using ultra-dense multilocus mapping

Mollinari

Olukolu

Pereira

et al. 2019

Preprint

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“…An allohexaploid origin of the sweetpotato, which is closely related to the diploid genomes of I. trifida and I. triloba, was also proposed on the basis of comparative analyses of key morphology and major characteristics (Austin 1988). However, cytogenetic studies indicate that the sweetpotato may have been derived from polyploidization of the same genome as those in the autotetraploid and diploid forms of I. trifida (Shiotani and Kawase 1987;Shiotani 1988;Shiotani and Kawase 1989).…”

Section: Introductionmentioning

confidence: 99%

Wx intron variations support an allohexaploid origin of the sweetpotato [Ipomoea batatas (L.) Lam]

et al. 2010

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To clarify the polyploid origin of the sweetpotato, we analyzed retentions of three distinctive types of Waxy intron 2 (Wx-In2) variants among 27 sweetpotato lines and 24 selected relatives and their phylogenetic relationships with Wx-In2 from 11 closest relatives. The three types of Wx-In2 effectively distinguish three diploid constituent genomes of very close homeology in the sweetpotato: Type I is characteristic of some loci in Genome I and III, and Types II and III are specific to loci in Genome II and III. The Type I Wx-In2 variation was found to be retained in 19 sweetpotato lines, Ipomoea littoralis Blume (49), I. tabascana (49), and I. tenuissima (29); Type II to be retained in all 27 sweetpotato lines, I. littoralis Blume, and two I. trifida accessions; Type III to be retained in 13 sweetpotato lines, I. tenuissima, and four distantly related species. Because of the nature of independent random divergence of orthologous intronic sequences, these highly selective retentions of genome-specific or characteristic sweetpotato Wx-In2 variations among four diploid or tetraploid sweetpotato relatives are consistent only with separate lineages of diploid genomes of the sweetpotato. Such an allohexaploid origin of the sweetpotato probably occurred via hybridization between I. tenuissima and I. littoralis Blume, derived earlier from I. trifida and an unidentified species sibling to I. tenuissima. However, neither the involvement of I. tabascana nor a multiple origin of the sweetpotato can be ruled out. The inference is supported by maximal likelihood relationships between the three types of Wx-In2 from the sweetpotato and Wx-In2 from its 11 closest relatives.

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“…Artifi cial hexaploid I. trifi da has also been produced (Shiotani and Kawase 1987 ); currently, it is understood that I. batatas is an autohexaploid of diploid I. trifi da , produced by several chromosomal duplication and crossing events (Fig. 25.3 ) (Shiotani and Kawase 1989 ). .2 Domestication and distribution of sweet potato.…”

Section: Origin Domestication and Compatibility Of Ipomoea Plantsmentioning

confidence: 99%

Self-Incompatibility System of Ipomoea trifida, a Wild-Type Sweet Potato

Tsuchiya

2014

Sexual Reproduction in Animals and Plants

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Diploid Ipomoea trifi da (Convolvulaceae) is a close relative of the cultivated hexaploid Ipomoea batatas , the cultivated sweet potato. These plants have sporophytic self-incompatibility that is regulated by a single multiallelic locus, designated as the S -locus. Genetic analyses of I. trifi da plants collected from Central America identifi ed about 50 different S -haplotypes with a linear dominance hierarchy having some codominance relationships. A linkage map of DNA markers around the S -locus indicated that the S -locus is delimited to 0.23 cM. Within the S -locus genomic region, a hypervariable genomic region of 35-95 kbp was identifi ed, and we designated this region SDR ( S -locus-specifi c divergent region). Of the several genes located within the SDR, one anther-specifi c gene, AB2 , and three stigma-specifi c genes, SE1 , SE2 , and SEA , are candidate S -genes that may encode male and female S -determinants of self-incompatibility.Keywords Ipomoea trifi da • Self-incompatibility • Sweet potato IntroductionSelf-incompatibility (SI) is a genetic mechanism to prevent self-fertilization (and thus encourage outcrossing) in angiosperms. In self-incompatible plants, when a pollen grain is recognized as the same type as self, some stage of pollen germination, pollen tube elongation, ovule fertilization, or embryo development is halted, and no seeds are produced. SI is classifi ed into several groups: homomorphic SI, heteromorphic SI, cryptic SI (CSI), and late-acting SI. Heteromorphic SI is classifi ed into two groups: distyly is determined by a single locus, which has two alleles, and tristyly is determined by two loci, each with two alleles. Heteromorphic SI is sporophytic, in that both alleles in the male plant determine the SI response in the pollen. CSI exists in a limited number of taxa (for example, there is evidence for CSI in Silene vulgaris in the Caryophyllaceae; Glaettli 2004 ). In this mechanism, the simultaneous presence of cross-and self-pollen on the same stigma results in higher seed set from cross-pollen (Bateman 1956 ). Late-acting SI is also termed ovarian SI. In this mechanism, self-pollen germinates and reaches the ovules, but no fruit is set (Seavey and Bawa 1986 ;Sage et al. 1994 ).Homomorphic SI is classifi ed into sporophytic SI (SSI) and gametophytic SI (GSI) . The SSI system is found in species of several plant families, such as the Brassicaceae, Asteraceae, Malvaceae, Betulaceae, Sterculiaceae, Polemoniaceae, and Convolvulaceae (de Nettancourt 2001 ; Allen and Hiscock 2008 ). In the plants in these families, SI is genetically regulated by a single multi-allelic locus, the S -locus . Within the S -locus, a pair of genes (named S -genes ), one encoding the male-determinant molecules and the other the female-determinant molecules, is localized. These genes are essential for the SI reaction, because these gene products contribute to self/non-self recognition. The sets of S -genes are tightly linked at the S -locus, and the S -locus (also called S -haplotype : Nasrallah and Na...

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Genomic structure of the sweet potato and hexaploids in Ipomoea trifida(H.B.K.) Don.

Cited by 60 publications

References 8 publications

Unraveling the hexaploid sweetpotato inheritance using ultra-dense multilocus mapping

Unraveling the hexaploid sweetpotato inheritance using ultra-dense multilocus mapping

Wx intron variations support an allohexaploid origin of the sweetpotato [Ipomoea batatas (L.) Lam]

Self-Incompatibility System of Ipomoea trifida, a Wild-Type Sweet Potato

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