The Role of the Wild Ipomoea Trifida Germplasm in Sweet Potato Breeding

Shiotani, Itaru; Huang, ZR; Sakamoto, Satoshi; Miyazaki, T.

doi:10.17660/actahortic.1994.380.61

Cited by 5 publications

(4 citation statements)

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“…A very close homeology of three diploid genomes in the hexaploid sweetpotato genome is evidenced by the high inter-specific crossability between many species in the series Batatas, including between some of the diploid species and the sweetpotato (Diaz et al 1996;Kobayashi et al 1994;Kowyama et al 1980;Nishiyama et al 1975;Shiotani 1988;Shiotani and Kawase 1987;Shiotani et al 1994), and by the very high sequence similarities among 13 Wx genomic amplicons from three diploid genomes in the sweetpotato SC1149 line examined in this study. A close homeology is also implied in several previous studies comparing major plant characteristics of the sweetpotato and its closest relatives and in cytological studies, leading to the conclusion of an autohexaploid sweetpotato genome (Nishiyama et al 1975;Oracion et al 1990;Shiotani 1988).…”

Section: Discussionmentioning

confidence: 61%

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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Section: Discussionmentioning

confidence: 61%

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

et al. 2010

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“…The wild conspecific as well as I . trifida have been documented for their contribution to increases in protein and starch content, and nematode and SPW resistance ( Iwanaga, 1988 ; Shiotani et al, 1994 ), although there is uncertainty for some material as to whether they may actually have been feral forms of the cultivar ( Nimmakayala et al, 2011 ). Species that have been explored for potential traits of use in crop improvement include I .…”

Section: Introductionmentioning

confidence: 99%

“…triloba for drought tolerance, root rot resistance, and foliar fungal disease resistances ( Iwanaga, 1988 ; Jarret et al, 1992 ; Komaki, 2004 ; Zhang and Liu, 2005 ; Nimmakayala et al, 2011 ). Challenges in the creation of viable progeny between the CWR and the cultivated species are not insignificant, though, due to differences in ploidy and interspecific incompatibility ( Martin, 1970 , 1982 ; Teramura, 1979 ; Lu and Li, 1992 ; Shiotani et al, 1994 ; Diaz et al, 1996 ; Komaki, 2004 ; Nimmakayala et al, 2011 ).…”

Section: Introductionmentioning

confidence: 99%

Distributions, ex situ conservation priorities, and genetic resource potential of crop wild relatives of sweetpotato [Ipomoea batatas (L.) Lam., I. series Batatas]

et al. 2015

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Crop wild relatives of sweetpotato [Ipomoea batatas (L.) Lam., I. series Batatas] have the potential to contribute to breeding objectives for this important root crop. Uncertainty in regard to species boundaries and their phylogenetic relationships, the limited availability of germplasm with which to perform crosses, and the difficulty of introgression of genes from wild species has constrained their utilization. Here, we compile geographic occurrence data on relevant sweetpotato wild relatives and produce potential distribution models for the species. We then assess the comprehensiveness of ex situ germplasm collections, contextualize these results with research and breeding priorities, and use ecogeographic information to identify species with the potential to contribute desirable agronomic traits. The fourteen species that are considered the closest wild relatives of sweetpotato generally occur from the central United States to Argentina, with richness concentrated in Mesoamerica and in the extreme Southeastern United States. Currently designated species differ among themselves and in comparison to the crop in their adaptations to temperature, precipitation, and edaphic characteristics and most species also show considerable intraspecific variation. With 79% of species identified as high priority for further collecting, we find that these crop genetic resources are highly under-represented in ex situ conservation systems and thus their availability to breeders and researchers is inadequate. We prioritize taxa and specific geographic locations for further collecting in order to improve the completeness of germplasm collections. In concert with enhanced conservation of sweetpotato wild relatives, further taxonomic research, characterization and evaluation of germplasm, and improving the techniques to overcome barriers to introgression with wild species are needed in order to mobilize these genetic resources for crop breeding.

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“…Ipomoea leucantha Jacq. Heat tolerance, sandy soil tolerance , gene transfer (Austin, 1978) Ipomoea trifida (Kunth) G. Don High starch content (Shiotani et al, 1991), dry matter yield, protein content (Iwanaga, 1988), black rot resistance (Sakamoto, 1976;Shiotani et al, 1991;Lebot, 2010;Khoury et al, 2015), root knot nematode [Meloidogyne incognita (Kofoid & White) Chitwood] resistance, root lesion nematode (Pratylenchus flakkensis Seinhorst) resistance (Sakamoto, 1976;Iwanaga, 1988;Shiotani et al, 1991), weevil (Cylas formicarius Fab.) resistance (Iwanaga, 1988;Shiotani et al, 1991;Lebot, 2010;Khoury et al, 2015), heat tolerance, waterlogging tolerance , yield improvement (Iwanaga, 1988;Khoury et al, 2015), drought tolerance (Shiotani et al, 1991;Lebot, 2010;Khoury et al, 2015), scab resistance (Lebot, 2010;Khoury et al, 2015) Ipomoea triloba L. Drought tolerance (Yang et al, 2009;Khoury et al, 2015), soluble sugar (Yang et al, 2009), heat tolerance…”

Section: Sweet Potatomentioning

confidence: 99%

A Crop Wild Relative Inventory for Mexico

Contreras-Toledo

Cortés-Cruz²,

Costich

et al. 2018

Crop Science

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Crop wild relatives (CWR) are valuable sources of variation for the genetic improvement of crops. Mexico is an important center of diversity of crops and CWR. However, this diversity is threatened by climate change, habitat degradation, increasing human population, among other factors. Given the large number of CWR, the creation of a CWR inventory is the starting point for the development of a national CWR conservation strategy. The process for the preparation of a national CWR inventory for Mexico consisted of (i) producing a list of national crop species, (ii) matching the crop genera with the list of national flora to produce a CWR checklist, and (iii) prioritizing the CWR checklist according to a series of selection criteria and using a ranking system. The selection criteria included the economic value of the related crop, the potential for crop improvement, food intake, threat status, geographical distribution, and crop use. Applying these criteria, 310 prioritized CWR taxa were selected (~2% of the national CWR diversity), integrating the national CWR inventory. They are mostly related to food crops of national but also global importance, such as maize (Zea mays L.), common bean (Phaseolus vulgaris L.), chili pepper (Capsicum annuum L.), squash (Cucurbita spp.), potato (Solanum tuberosum L.), cassava (Manihot esculenta Crantz), and sweet potato [Ipomoea batatas (L.) Lam.]. Approximately 31% of the taxa are endemic to Mexico. The inventory will help to develop in situ and ex situ conservation plans as part of a national CWR conservation strategy.

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The Role of the Wild Ipomoea Trifida Germplasm in Sweet Potato Breeding

Cited by 5 publications

References 0 publications

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

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

Distributions, ex situ conservation priorities, and genetic resource potential of crop wild relatives of sweetpotato [Ipomoea batatas (L.) Lam., I. series Batatas]

A Crop Wild Relative Inventory for Mexico

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