Different maternal origins of Japanese lowland and upland rice populations

Ishikawa, Ryuji; Sato, Yoichiro; Tang, Ting; Nakamura, Ikuo

doi:10.1007/s00122-001-0807-y

Cited by 25 publications

(13 citation statements)

References 9 publications

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“…In the previous paper (Ishikawa et al 2002a), we reported heterozygotes in Laos where primitive cultivars were cocultivated in single fields. Also strains intermediate between indica and japonica could be seen.…”

Section: Discussionmentioning

confidence: 95%

“…The two types reveal distinct characters in all traits except for cultivated traits. In general, they are cultivated in separate fields, though on the Himalayan foot hills and South-Asian mountain areas they are cultivated in closely located fields (Sano and Morishima 1992;Ishikawa et al 2002a). In these areas, heterozygotes and intermediate types on isozyme analysis were frequently found.…”

Section: Introductionmentioning

confidence: 98%

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Origin of Weedy Rice Grown in Bhutan and the Force of Genetic Diversity

Ishikawa

Toki

Imai

et al. 2005

Genet Resour Crop Evol

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In Bhutan, weedy rice (Oryza sativa L.) was grown together with cultivated rice on terraced paddy fields lower than 2620 m above sea level. Seeds of cultivars and weedy strains were collected at 22 collection sites located from 1000 to 2620 m above sea level. Cultivars with round seeds were frequently found in fields higher than 2250 m, and those with slender seeds in fields lower than 1630 m. All cultivars and weedy strains were divided into indica or japonica types by isozyme (multi-locus) and morpho-physiological (multicharacter) analyses. Japonica cultivars predominated in highland; Indica cultivars predominated in lowland. Plastid type was confirmed by the length polymorphism for the ORF100 region. The japonica cultivars carried non-deletion type ORF100. The indica cultivars carried deletion type ORF100. In contrast, weedy strains showed discrepancy in the combination of the nuclear and cytoplasm types. An intermediate type was found in weedy strains for isozyme genotypes. A recombinant type, which has indica genotypes for isozyme analysis with japonica cytoplasm, and vice versa, was frequently found in weedy strains. These findings suggested that weedy strains would be generated by natural hybridization between indica and japonica. Further, they might fail to recombine their prior genotypes sets for isozyme and cytoplasm. Morphophysiological characters did not show such a tendency. Morpho-physiological analysis of highland plants, in particular, showed indica cultivars and weedy strains with japonica cytoplasm. Hypervariable nuclear microsatellite analysis was then used to compare cultivars and weedy strains. Identical alleles were shared between indica and japonica, and also between cultivars and weedy strains. This suggested that there was gene-flow resulting from natural hybridization.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 98%

Origin of Weedy Rice Grown in Bhutan and the Force of Genetic Diversity

Ishikawa

Toki

Imai

et al. 2005

Genet Resour Crop Evol

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“…Such cytoplasm-substituted cultivars are unusual. Our previous report (Ishikawa et al 2001) showed only one out of 50 lowland and 80 upland cultivars in Japan revealed such a substitution. As to the nuclear genotypes of the Japanese indica cultivars, all but one were characterized as Pgd1 3 , with a red pericarp, a slender hull, and a short apiculus hair length.…”

Section: Discussionmentioning

confidence: 99%

“…How are such cytoplasm-substituted cultivars created in nature? In upland fields, we can still see heterozygotes and extremely wide variation for morphological and physiological markers in single fields of Laos (Ishikawa et al 2001). The cultivation system adopted in primitive upland fields enables rice plants to outcross.…”

Section: Discussionmentioning

confidence: 99%

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Origin of cytoplasm substituted rice cultivars found in Japan

et al. 2002

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Genetic variation of Japanese rice cultivars were examined. Five of 450 lowland cultivars and another five of 200 upland cultivars were determined as the indica type by using isozyme genotypes and the remainder were of the japonica type. The major characteristics of these indica cultivars, revealed a slender shape of grains, a short apiculus hair length, a positive allele for Ph reaction, and allele-3 for the Pgd1 locus. Three of these indica cultivars showed a non-deletion ORF100, which is essential to the japonica-type plastid. The plastid subtype identity (PS-ID) sequences of these plastids is 6C7A, which is also a japonica-specific repeat unit. Thus, these cultivars were concluded to be naturally generated cytoplasm substituted lines. These plastids were introduced into a indica genetic background from japonica cultivars grown elsewhere. The rest of the indica cultivars revealed a deletion-type ORF100 and plastid subtype 8C8A, both of which are indica-specific. These cultivars carried indica-type allelic constitutions for diagnostic isozyme loci. However, other characters were identical to the cytoplasm-substituted cultivars in Japan. In East and Southeast Asia, cultivars carrying a indica-type nuclear genotype with a japonica-type plastid are restricted to Aus cultivars in the Bengal region. Genetic and historical records suggest that Japanese indica cultivars and the Aus cultivars are closely related. The Aus cultivars acquire necessary genetic constitutions from both indica and japonica cultivars through naturally occurring out-crossing to adapt to a particular cultivation condition in the region. The wide adaptability enabled them to be introduced into a northern region like Japan.

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Breeding of Interspecific Hybridization Among Carnation (Dianthus caryophyllus L.), Dianthus japonicus Thunb., and Dianthus × isensis Hirahata et Kitam.

Nimura¹

2020

Compendium of Plant Genomes

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Different maternal origins of Japanese lowland and upland rice populations

Cited by 25 publications

References 9 publications

Origin of Weedy Rice Grown in Bhutan and the Force of Genetic Diversity

Origin of Weedy Rice Grown in Bhutan and the Force of Genetic Diversity

Origin of cytoplasm substituted rice cultivars found in Japan

Breeding of Interspecific Hybridization Among Carnation (Dianthus caryophyllus L.), Dianthus japonicus Thunb., and Dianthus × isensis Hirahata et Kitam.

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