Synthetic hexaploids derived from wild species related to sweet potato.

Shiotani, Itaru; Kawase, Tsuneo

doi:10.1270/jsbbs1951.37.367

Cited by 35 publications

(29 citation statements)

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“…Although we referred to it as I. leucantha in our previous paper (Kowyama et a!., 1980), the species name I. trifida is used here following the proposals of Austin (1983) and Shiotani & Kawase(1987).…”

Section: Materials and Methods P/ant Materialsmentioning

confidence: 99%

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Number, frequency & dominance relationships of S-alleles in diploid Ipomoea trifida

et al. 1994

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Self-incompatibility genotypes of 224 plants of Ipomoea trifida from six populations in Central America have been determined by genetic analysis of segregants in F1 families derived from crosspollinations with the most recessive homozygote. A total of 49 different S-alleles was identified in these populations. From analyses of S-allelic interactions in heterozygous plants which were generated from cross-pollinations between plants possessing different S-alleles, a linear dominance hierarchy with six levels has been established among 28 S-alleles in both pollen and stigma.Codominance of alleles occurred more frequently in the stigma (9.2 per cent) than in the pollen (4.9 per cent). Nonlinear dominance relationships were rarely observed. Unequal frequencies of Salleles have been found in all populations examined, the most common S-allele being, as expected, the most recessive. This suggests that recessive S-alleles are widely distributed throughout Central America. The diversity of the multiple S-alleles observed in the present study also suggests that the southern area of Mexico to Guatemala is a centre of genetic variation in diploid I. trijIda.

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Section: Materials and Methods P/ant Materialsmentioning

confidence: 99%

“…One of the diploid wild species, I. trifida, is closely related to the sweet potato, I. batatas, and has been used as a genetic resource for sweet potato improvement (Kobayasi & Miyazaki, 1976;Shiotani & Kawase, 1987;. I. trtjida is an insect-pollinated perennial which propagates predominantly by seed.…”

Section: Introductionmentioning

confidence: 99%

Number, frequency & dominance relationships of S-alleles in diploid Ipomoea trifida

et al. 1994

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“…Due to self-and cross-incompatibility in sweetpotato, caused by incompatibility alleles (Shiotani and Kawase, 1987), polycross and diallel crossing are the mating designs commonly used in the breeding (Hwang et al, 2002;Laurie et al, 2009) combined with genetic analysis (Mwanga et al, 2002;Chiona, 2010;Shumbusha et al, 2014;Musembi et al, 2015). Diallel analysis is a breeding tool that makes use of direct crosses between selected genotypes, in order to obtain information on the combining abilities, which are then used to predict the performance of the progenies (Buteler et al, 2002;Bertan et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Genetic analysis of yield and flesh colour in sweetpotato

Naidoo¹,

Laurie²,

Vorster³

et al. 2016

Afr. Crop Sci. J.

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“…However, according to its chromosome number and SI, I. trifi da seems to be the wild species most closely related to I. batatas , and Huang and Sun ( 2000 ) revealed that I. trifi da is the ancestral species of I. batatas , according to inter-simple sequence repeat and restriction analyses of chloroplast DNA. 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 ).…”

Section: Origin Domestication and Compatibility Of Ipomoea Plantsmentioning

confidence: 99%

“…I. trifi da , a diploid species of the section Batatas, is a useful genetic resource in sweet potato breeding (Shiotani and Kawase 1987 ). I. trifi da is an herbaceous insect-pollinated weed native to Central America and has a relatively small genome (532 Mbp, 831 Mbp per haploid) (Arumuganathan and Earle 1991 ;Ozias-Akins and Jarret 1994 ).…”

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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Synthetic hexaploids derived from wild species related to sweet potato.

Cited by 35 publications

References 10 publications

Number, frequency & dominance relationships of S-alleles in diploid Ipomoea trifida

Number, frequency & dominance relationships of S-alleles in diploid Ipomoea trifida

Genetic analysis of yield and flesh colour in sweetpotato

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

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