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Yamanaka, Shinşuke

doi:10.1023/a:1023926802198

Cited by 75 publications

(10 citation statements)

References 24 publications

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“…However, because O. rufipogon is a perennial species and cultivated rice is an annual species, it has been proposed that the annually occurring form of O. rufipogon, Oryza nivara, may represent the most recent ancestor of O. sativa (13,15). Here we treat both O. rufipogon and O. nivara as part of the same ancestral gene pool and do not differentiate between these names when referring to wild rice.…”

Section: Study Systemmentioning

confidence: 99%

“…In this scenario, O. sativa japonica varieties were later developed in upland growing regions, selected from the indica rice (24,25). The alternative hypothesis of at least two separate domestication events leading to indica and japonica rice has been suggested by genetic distance studies (15,20,21,26,27). The genetic distance data reveal that japonica and indica are genetically distinct from each other, raising the possibility that the two major rice types may have arisen from different ancestral gene pools; however, these studies lack the resolution to identify unambiguously the geographic region(s) associated with the domestication of O. sativa.…”

Section: Study Systemmentioning

confidence: 99%

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Phylogeography of Asian wild rice, Oryza rufipogon , reveals multiple independent domestications of cultivated rice, Oryza sativa

Londo

Chiang

Hung

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

609

466

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Cultivated rice, Oryza sativa L., represents the world's most important staple food crop, feeding more than half of the human population. Despite this essential role in world agriculture, the history of cultivated rice's domestication from its wild ancestor, Oryza rufipogon, remains unclear. In this study, DNA sequence variation in three gene regions is examined in a phylogeographic approach to investigate the domestication of cultivated rice. Results indicate that India and Indochina may represent the ancestral center of diversity for O. rufipogon. Additionally, the data suggest that cultivated rice was domesticated at least twice from different O. rufipogon populations and that the products of these two independent domestication events are the two major rice varieties, Oryza sativa indica and Oryza sativa japonica. Based on this geographical analysis, O. sativa indica was domesticated within a region south of the Himalaya mountain range, likely eastern India, Myanmar, and Thailand, whereas O. sativa japonica was domesticated from wild rice in southern China.

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Section: Study Systemmentioning

confidence: 99%

Section: Study Systemmentioning

confidence: 99%

Phylogeography of Asian wild rice, Oryza rufipogon , reveals multiple independent domestications of cultivated rice, Oryza sativa

Londo

Chiang

Hung

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

609

466

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“…In the Near East center of domestication (the ''Fertile Crescent''), the wild ancestors of the crops upon which agriculture was founded are known (e.g., wheats, barley, pea, lentil, and chickpea) (12). The geographic distributions of these wild ancestors, together with biochemical and genetic data, have been used to suggest that emmer wheat, einkorn wheat, peas, chickpeas, and lentils were domesticated from wild progenitors just once or a few times in a single geographic region (12)(13)(14)(15)(16)(17)(18) In contrast to the Near East center, crops domesticated in the Mediterranean region and other parts of the world have been derived more than once from their wild progenitors [e.g., olives (19)(20)(21), rice (22,23), and breadfruit (24)]. Within the Mesoamerican center of domestication (Central Mexico to northwestern Costa Rica), at least 80 native species have been cultivated historically (2, 3 25-29).…”

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confidence: 99%

Domestication of a Mesoamerican cultivated fruit tree, Spondias purpurea

Miller

Schaal

2005

Proc. Natl. Acad. Sci. U.S.A.

108

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Contemporary patterns of genetic variation in crops reflect historical processes associated with domestication, such as the geographic origin(s) of cultivated populations. Although significant progress has been made in identifying several global centers of domestication, few studies have addressed the issue of multiple origins of cultivated plant populations from different geographic regions within a domestication center. This study investigates the domestication history of jocote (Spondias purpurea), a Mesoamerican cultivated fruit tree. Sequences of the chloroplast spacer trnG-trnS were obtained for cultivated and wild S. purpurea trees, two sympatric taxa (Spondias mombin var. mombin and Spondias radlkoferi), and two outgroups (S. mombin var. globosa and Spondias testudinus). A phylogeographic approach was used and statistically significant associations of clades and geographical location were tested with a nested clade analysis. The sequences confirm that wild populations of S. purpurea are the likely progenitors of cultivated jocote trees. This study provides phylogeographic evidence of multiple domestications of this Mesoamerican cultivated fruit tree. Haplotypes detected in S. purpurea trees form two clusters, each of which includes alleles recovered in both cultivated and wild populations from distinct geographic regions. Cultivated S. purpurea populations have fewer unique trnG-trnS alleles than wild populations; however, five haplotypes were absent in the wild. The presence of unique alleles in cultivation may reflect contemporary extinction of the tropical dry forests of Mesoamerica. These data indicate that some agricultural habitats may be functioning as reservoirs of genetic variation in S. purpurea.crop origins ͉ Mesoamerica ͉ phylogeography ͉ genetic variation

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“…O. sativa is believed to have been domesticated from the gene pool of the wild perennial species O. rufipogon Griff. and (or) the annual species O. nivara Sharma et Shastry (Yamanaka et al 2003). Various hypotheses have been proposed for the domestication of rice, including single, dual, and multiple domestication hypotheses (Oka 1988;Second 1982;Londo et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Genetic variation in the chloroplast genome suggests multiple domestication of cultivated Asian rice (Oryza sativa L.)

Kawakami

Ebana

Nishikawa

et al. 2007

Genome

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Two hundred and seventy-five accessions of cultivated Asian rice and 44 accessions of AA genome Oryza species were classified into 8 chloroplast (cp) genome types (A-H) based on insertion-deletion events at 3 regions (8K, 57K, and 76K) of the cp genome. The ancestral cp genome type was determined according to the frequency of occurrence in Oryza species and the likely evolution of the variable 57K region of the cp genome. When 2 nucleotide substitutions (AA or TT) were taken into account, these 8 cp types were subdivided into 11 cp types. Most indica cultivars had 1 of 3 cp genome types that were also identified in the wild relatives of rice, O. nivara and O. rufipogon, suggesting that the 3 indica cp types had evolved from distinct gene pools of the O. rufipogon - O. nivara complex. The majority of japonica cultivars had 1 of 3 different cp genome types. One of these 3 was identified in O. rufipogon, suggesting that at least 1 japonica type is derived from O. rufipogon with the same cp genome type. These results provide evidence to support a polyphyletic origin of cultivated Asian rice from at least 4 principal lineages in the O. rufipogon - O. nivara complex.

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Cited by 75 publications

References 24 publications

Phylogeography of Asian wild rice, Oryza rufipogon , reveals multiple independent domestications of cultivated rice, Oryza sativa

Phylogeography of Asian wild rice, Oryza rufipogon , reveals multiple independent domestications of cultivated rice, Oryza sativa

Domestication of a Mesoamerican cultivated fruit tree, Spondias purpurea

Genetic variation in the chloroplast genome suggests multiple domestication of cultivated Asian rice (Oryza sativa L.)

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