Morpho-physiological Characters and Geographical Distribution of japonica and indica Weedy Rice (Oryza sativa) in Okayama Prefecture, Japan

Ushiki, Jun; Ishii, Toshio; Ishikawa, Ryuji

doi:10.1270/jsbbr.07.179

Cited by 13 publications

(30 citation statements)

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“…In order to determine the origins of these rare and indica-specific alleles in more detail, we surveyed the variation for several simple sequence repeat (SSR) markers and single nucleotide polymorphisms (SNPs) flanking to these isozyme loci. In addition, Ushiki et al (2005) found that, of the 19 strains tested, two exhibited a semidwarf statue, which resembled modern varieties bred with SEMI-DWARF1 (SD1, OsGA20ox2). Then, we tried to determine a causal allele concerning the semi-dwarf phenotype in the weedy strains, based on sequence analyses for the candidate gene, sd1, on chromosome 1.…”

Section: Introductionmentioning

confidence: 90%

“…The weedy strains used in this study were the same as those described by Ushiki et al (2005). Nineteen weedy strains were collected in Okayama, Japan ( Fig.…”

Section: Plant Materialsmentioning

confidence: 99%

“…1 and Table 1). Based on morphophysiological traits, these weedy strains were categorized into nine types (Ushiki et al 2005). Two strains from Masatsu site (A-1 and A-2), one strain from Nishi-ichi (B), and two strains from Kurata (C-1 and C-2) were categorized as type 1.…”

Section: Plant Materialsmentioning

confidence: 99%

“…However, not all paddy fields could be used in such ways for inhibiting weedy rice. To prevent the further generation of weedy rice, Ushiki et al (2005) characterized morphophysiological traits of weedy rice plants collected from 11 sites in Okayama prefecture. A total of 19 strains tested were further categorized into japonica type and indica type (hereafter, referred as japonica-type and indica-type weedy strains).…”

Section: Introductionmentioning

confidence: 99%

“…Such mimic-type weedy strains will result in major problems to maintain rice grain quality because it is very difficult to weed-out by visible characteristics until the weedy strains start to disperse their seeds. On the other hand, indica-type weedy strains were different in various morphophysiological traits from the japonica-type weedy strains, suggesting that they had resulted from outcrossing between indica and japonica varieties (Ushiki et al 2005). Such weedy strains may be weeded out when farmers cautiously care for their crops.…”

Section: Introductionmentioning

confidence: 99%

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Molecular constitution of weedy rice (Oryza sativa L.) found in Okayama prefecture, Japan

et al. 2009

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Weedy rice (Oryza sativa L.) plants found in Okayama, Japan, exhibit various morphophysiological characteristics, and are roughly classified into japonica-type and indica-type. We characterized the weedy strains collected from nine sites with molecular markers in flanking regions of two diagnostic isozyme loci, Acp1 and Sdh1. Haplotype analysis for closely-linked SSR markers flanking Acp1 revealed that 1) japonica-type weedy strains shared the same haplotypes with local varieties, and 2) indica-type weedy strains carrying an indica-specific isozyme allele possessed two haplotypes. One of the two haplotypes was common to a forage variety, 'Moretsu'. PCR analysis revealed that the dwarf weedy strains carried the deletion inside OsGA20ox2 as the semi-dwarf allele (sd1). The deletion was also found in 'Moretsu'. The other haplotype was shared with indica forage variety, 'Tetep', which showed the same sequence haplotype for Sdh1 with the indica-type weedy strains. The results obtained from this study suggested that the weedy strains in Okayama have multiple origins and semi-dwarfness possibly derived from 'Moretsu' or indica modern varieties.

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Section: Introductionmentioning

confidence: 90%

“…The weedy strains used in this study were the same as those described by Ushiki et al (2005). Nineteen weedy strains were collected in Okayama, Japan ( Fig.…”

Section: Plant Materialsmentioning

confidence: 99%

Section: Plant Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular constitution of weedy rice (Oryza sativa L.) found in Okayama prefecture, Japan

et al. 2009

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Seed germination responses to temperature and water availability in weedy rice

Fukuda

Imaizumi

Koarai

2022

Pest Management Science

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BACKGROUND Weedy rice is one of the main agricultural weeds infesting transplanted and direct‐seeded rice cultures across Japan. However, the environmental factors that facilitate its proliferation are largely unknown. This study investigated the effects of temperature and water availability on seed germination of Japanese weedy and cultivated rice strains differing in degree of seed dormancy and after‐ripening. This information could help predict weedy rice infestation and design efficacious control measures. RESULTS The germination responses of weedy rice to temperature and water availability varied among strains and after‐ripening duration. The germination rate varied inversely with the degree of dormancy, increased with water availability, and fluctuated between low and high temperatures. The shallow‐dormant tropical japonica‐derived strawhull weedy rice (TRJ) germinated at 10 °C unlike the temperate japonica‐derived weedy rice strains, namely, the intermediate‐dormant blackhull (BH) and the deep‐dormant strawhull (SH). Seeds of all plant strains germinated below the permanent wilting point of clay loam soil, but the germination rates were higher for TRJ and BH than for cultivated rice. SH germination was more synchronous with rice than the other weedy rice strains. CONCLUSION This study has confirmed the overall robustness of germination cold tolerance at 10 °C in TRJ, high germinability at low‐water availability and high temperature in TRJ and BH, and relatively more synchronous germination between SH and cultivated rice in seeds grown in different years. These observed characteristics are considered advantageous to the coexistence of weedy rice with cultivated rice. © 2022 Society of Chemical Industry.

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Population Genomics of Weedy Crop Relatives: Insights from Weedy Rice

Olsen

2020

Population Genomics

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Morpho-physiological Characters and Geographical Distribution of japonica and indica Weedy Rice (Oryza sativa) in Okayama Prefecture, Japan

Cited by 13 publications

References 1 publication

Molecular constitution of weedy rice (Oryza sativa L.) found in Okayama prefecture, Japan

Molecular constitution of weedy rice (Oryza sativa L.) found in Okayama prefecture, Japan

Seed germination responses to temperature and water availability in weedy rice

Population Genomics of Weedy Crop Relatives: Insights from Weedy Rice

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