A5049896206- Weed Control and Herbicide Applications
- Genetic Mapping and Diversity in Plants and Animals
- Plant and animal studies
- Seed Germination and Physiology
- Plant tissue culture and regeneration
- Rice Cultivation and Yield Improvement
- Plant Pathogens and Resistance
- GABA and Rice Research
- Nematode management and characterization studies
- Agronomic Practices and Intercropping Systems
- Legume Nitrogen Fixing Symbiosis
- Plant Parasitism and Resistance
- Soybean genetics and cultivation
- Plant Genetic and Mutation Studies
- bioluminescence and chemiluminescence research
- Potato Plant Research
- Insect and Pesticide Research
- Biofield Effects and Biophysics
- Plant Virus Research Studies
- Seed and Plant Biochemistry
- Plant responses to water stress
- Yeasts and Rust Fungi Studies
- Ecology and Conservation Studies
- Biological Control of Invasive Species
- Bioenergy crop production and management
National Agriculture and Food Research Organization
2017-2025
Kyushu Okinawa Agricultural Research Center
2024-2025
Institute for Sustainable Plant Protection
2021
Duke University
2017
Agricultural Research Center
2015
Central Region Agricultural Research Center
2013
Kyoto University
1968-2009
Abstract Background Worldwide feralization of crop species into agricultural weeds threatens global food security. Weedy rice is a feral form that infests paddies worldwide and aggressively outcompetes cultivated varieties. Despite increasing attention in recent years, comprehensive understanding the origins weedy relatives how universal process acts at genomic molecular level to allow rapid adaptation weediness are still yet be explored. Results We use whole-genome sequencing examine origin...
Germination represents the first major transition in plants, and seed dormancy influences germination timing. However, mechanism by which variations due to genetic variation or maternal environment influence timing has not been studied depth. In this study, effects of temperature during maturation (maternal temperature) on weedy rice seedling emergence a field were evaluated. The experiments repeated for 4 years using seeds collected from groups, represented different degrees dormancy. was...
Abstract Agricultural weeds are the most important biotic constraints to global crop production, and chief among these is weedy rice. Despite increasing yield losses from rice in recent years worldwide, genetic basis of weediness evolution remains unclear. Using whole-genome sequence analyses, we examined origins adaptation Japanese We find evidence for a weed origin tropical japonica ancestry, which has not previously been documented surveys worldwide. further show that occurs largely...
Summary Monochoria vaginalis is one of the most serious weeds rice fields in Asia. The species predominantly selfing. To reveal potential for multiple mutational events, outcrossing and gene flow sulfonylurea‐resistant (SU‐R) M. populations, we investigated (i) if each SU‐R population was a single biotype or mixture several biotypes using restriction analysis direct sequencing acetolacatate synthase (ALS) genes (ii) genetic diversity ‐susceptible (S) populations amplified fragment length...
To maximize crop growth, crops need to capture sunlight efficiently. This property is primarily influenced by the shape of such as angle, area, and arrangement leaves. We constructed a rice ( Oryza sativa L.) inbred line that displayed an ideal transition plant shapes in terms receiving efficiency. During vegetative this exhibited tiller spreading with increased number, which formed parabolic antenna-like structure. The architecture probably improved light reception efficiency individuals...
Plants adjust their phenology in response to seasonal cues experienced both by parents and themselves, coordinating responses these is necessary for expressing adaptive phenology. We investigated how are integrated across time influence an important progeny phenotype, i.e., seed germination.We used Arabidopsis thaliana investigate the photoperiod maternal influences germination. examined when effects on germination imposed long they persist progeny.The plants more strongly influenced than...
Weedy rice is a conspecific weed of cultivated ( Oryza sativa L.) and primary direct‐seeded production systems worldwide. The shift in the method establishing rice, that is, from transplanting to direct seeding, considered main reason for emergence weedy Asia and, more recently, Japan. Japan has increasingly adopted directly seeded even though this practice remains limited. In study, I confirmed relationship between red adoption Twenty‐seven areas eight prefectures infested with were...
Summary Areas infested with Solanum carolinense , an introduced perennial weed, have increased quickly in Japan. The genetic structure of a S. population along the Takano River Kyoto, Japan was investigated using amplified fragment length polymorphism (AFLP) analysis to reveal how introductions and local spread contributed development this population. Along terrace beside river adjacent roadside, we defined cluster above‐ground shoots as subpopulation 60 subpopulations were identified....
Summary The inheritance of sulfonylurea (SU) resistance in Monochoria vaginalis was investigated based on the bensulfuron‐methyl response phenotypes F 1 plants between SU‐resistant (R) and ‐susceptible (S) segregation analysis 2 progenies. Differences SU SU‐R biotypes at recommended field dose were also by comparing shoot dry weight. All survived treatment with 25 g a.i. ha −1 bensulfuron‐methyl, one‐third dose, showed similar responses to plants. Conversely, all died or extreme necrosis 225...
Summary To reveal the effects of herbicide selection on genetic diversity in outcrossing weed species S choenoplectus juncoides , six sulfonylurea‐resistant ( SU ‐R) and eight sulfonylurea‐susceptible ‐S) populations were analysed using 40 polymorphic inter‐simple sequence repeat loci. The plants collected from three widely separated regions: T ohoku, K anto yushu districts J apan. Genetic values (Nei's gene diversity, h ) within each ‐S population ranged = 0.125 to 0.235. average was H...
Plant hybridization is a pathway for the evolution of adaptive traits. However, between adapted and nonadapted populations may affect persistence combinations alleles evolved through natural selection. Seed dormancy an trait weedy rice because it regulates timing seed germination soil bank. Hybridization cultivated has been confirmed with introgression deep from rice. Here, we explored influence on conservation allele by evaluating variation genetic structure in dormancy-associated genomic...
Monochoria vaginalis is one of the most serious weeds rice fields in Asia. The species has both chasmogamous (CH) and cleistogamous (CL) flowers on individual plants. objective this study to clarify reproductive characteristics that affect selfing rate M. . An emasculation experiment revealed CH emasculated just after flower opening produced seeds. seed production was less than hand‐pollinated with pollen from another plant. These results indicate that, although self‐pollination before...
Weedy rice is one of the main agricultural weeds infesting transplanted and direct-seeded cultures across Japan. However, environmental factors that facilitate its proliferation are largely unknown. This study investigated effects temperature water availability on seed germination Japanese weedy cultivated strains differing in degree dormancy after-ripening. information could help predict infestation design efficacious control measures.The responses to varied among after-ripening duration....
コナギのスルホニルウレア系除草剤（SU剤）抵抗性生物型がこれまで顕在化していない静岡県において，この抵抗性生物型の発生の有無を調査した。その結果，静岡県東部から西部地域にかけて抵抗性生物型が広く発生していることが明らかとなった。認められた抵抗性生物型は，すべてALS1あるいはALS3のPro197部位に変異が認められたが，そのうち2地域からのSU剤抵抗性生物型は，コナギではこれまで報告のないプロリンからトレオニンへのアミノ酸置換であった。抵抗性生物型が採集された伊豆地域では，1km以内の距離にある異なる水田で異なるアミノ酸置換が認められたことから，抵抗性生物型は，それぞれの地域で独立して起源したと考えられた。この結果から，コナギの残草が顕在化していない水田においても抵抗性生物型が発生していることが明らかとなった。
Abstract Hybridization is a widespread phenomenon in plants and pathway for the evolution of adaptive traits. However, this process may also affect persistence combinations alleles evolved through natural selection when hybridization occurs between adapted non-adapted populations. weedy cultivated rice has been confirmed with an introgression deep seed dormancy from rice. In study, we explored influence on conservation by evaluating variation genetic structure genomic regions associated...
土壌水分がシロザ種子の休眠状態に与える影響を検討するため，畑条件・過湿条件・湛水条件において土壌表面および土壌中で越冬したシロザ種子の発芽率を調査した。2010年2月に，畑条件・過湿条件・湛水条件に設定した1/2000 aワグネルポットの土壌表面および土壌中にシロザ種子を設置した。種子は設置2ヶ月後から1ヶ月間隔で4回回収し，発芽試験およびTTC検定により発芽の有無および死滅を判定した。休眠状態は生存種子における発芽率で評価した。土壌水分がシロザ種子の休眠状態に与える影響は土壌中種子に対する湛水条件の効果が顕著で，湛水条件における生存種子発芽率は畑条件および過湿条件と比べ常に低く，湛水により休眠誘導が進むことが示された。土壌表面種子では，過湿条件・湛水条件は畑条件より休眠誘導の時期が早い傾向が認められるものの，湛水条件による土中種子の休眠誘導効果ほど大きくなかった。7月回収種子では畑条件でも他と同様に休眠誘導が進んでいた。以上のことから，湛水処理により土壌中のシロザ種子の休眠誘導が進むと考えられた。