A5071033627- Genetic Mapping and Diversity in Plants and Animals
- Rice Cultivation and Yield Improvement
- GABA and Rice Research
- Plant Disease Resistance and Genetics
- Plant Pathogens and Fungal Diseases
- Plant-Microbe Interactions and Immunity
- Plant Pathogenic Bacteria Studies
- Plant Genetic and Mutation Studies
- Plant nutrient uptake and metabolism
- Fungal and yeast genetics research
- Wheat and Barley Genetics and Pathology
- Plant responses to water stress
- Nematode management and characterization studies
- Genetics and Plant Breeding
- Plant Reproductive Biology
- Mycotoxins in Agriculture and Food
- Crop Yield and Soil Fertility
- Insect-Plant Interactions and Control
- Plant Micronutrient Interactions and Effects
- Agricultural Science and Fertilization
- Chromosomal and Genetic Variations
- Agriculture, Soil, Plant Science
- Legume Nitrogen Fixing Symbiosis
- Plant tissue culture and regeneration
- Agricultural Systems and Practices
Japan International Research Center for Agricultural Sciences
2015-2024
University of the Ryukyus
2024
Fukushima Prefectural Culture Center
2020-2021
Institute of Agrobiological Sciences
2006-2016
Bangladesh Rice Research Institute
2016
Tottori University
2015
Hokkaido Agricultural Research Center
2011
International Rice Research Institute
2001-2010
Iwate Medical University
2000
Osaka University
1998
Loss of seed shattering was a key event in the domestication major cereals. We revealed that qSH1 gene, quantitative trait locus rice, encodes BEL1-type homeobox gene and demonstrated single-nucleotide polymorphism (SNP) 5' regulatory region caused loss owing to absence abscission layer formation. Haplotype analysis association various rice collections SNP highly associated with among japonica subspecies implying it target artificial selection during domestication.
Significance This work reports discovery of a unique gene important for rice agriculture. A significant yield enhancement in modern cultivar was achieved by identification gene, SPIKELET NUMBER ( SPIKE ) Indonesian landrace. The increased grain an indica IR64, which is widely grown the tropics, over four seasons at field level and improved plant architecture without changing quality or growth period, are regional adaptability. These results indicate finding will be extremely valuable...
The wild rice species Oryza rufipogon with wide intraspecific variation is thought to be the progenitor of cultivated sativa two ecotypes, japonica and indica. To determine origin rice, subfamily members retroposon p-SINE1, which show insertion polymorphism in O. -O. population, were identified used "bar code" each 101 strains based on presence or absence p-SINE1 at respective loci. A phylogenetic tree constructed bar codes given showed that classified into groups corresponding indica,...
Ninety-eight backcross inbred lines (BC1F6) developed between Nipponbare, a japonica rice, and Kasalath, an indica rice were employed to detect putative quantitative trait loci (QTLs) associated with the contents of cytosolic glutamine synthetase (GS1; EC 6.3.1.2) NADH-glutamate synthase (NADH-GOGAT; 1.4.1.14) in leaves. Immunoblotting analyses showed transgressive segregations toward lower or greater these enzyme proteins lines. Seven chromosomal QTL regions for GS1 protein content six...
Grain-filling is a crucial process that determines final grain yield in rice (Oryza sativa L.). To understand the genetic basis of dynamics grain-filling, quantitative trait locus (QTL) analysis was conducted using time-related phenotypic data on grain-filling collected from population 155 recombinant inbred lines (F12), derived cross between Milyang 23 and Akihikari. Two QTLs detected chromosomes 8 12 were strongly associated with increased filling percentage per panicle. These not linked...
Understanding the genetic basis of reproductive barriers between species has been a central issue in evolutionary biology. The S 1 locus rice causes hybrid sterility and is major barrier two species, Oryza sativa glaberrima . O. -derived allele (denoted g ) on preferential abortion gametes with its allelic alternative s / heterozygotes. Here, we used mutagenesis screening fertile plants to isolate mutant an allele, mut , which does not confer hybrids. We found that causal mutation was...
A total of 119 blast (Magnaporthe grisea (Hebert) Barr.) isolates collected from the Philippines, were characterized for their pathogenicities using 19 rice (Oryza sativa L.) differential varieties (DVs) targeting 18 resistance genes. These classified into 31 groups based on reaction patterns to 9 DVs genes, Pia, Pib, Pii, Pit, Pita, Pish, Piz-t, Pi3, and Piz-5, at first, then further divided 70 pathotypes considering pattern other Pik, Pik-h, Pik-m, Pik-p, Pik-s, Pita-2, Piz, Pi1, Pi20(t)....
Blast is a serious disease caused by fungal pathogen Pyricularia oryzae Cavara of rice (Oryza sativa L.). The use resistant varieties considered one the most efficient ways crop protection from disease. In addition to large amount information accumulated during long history genetic studies on resistance blast, recent progress in genomics has enabled us DNA markers for breeding marker assisted selection (MAS). this report, we summarize reported blast genes and their encourage further...
The objective of this study was to investigate varietal differences in dry matter production and physiological nitrogen use efficiency (PNUE) using a wide range rice (Oryza sative L.) varieties at an early growth stage. results provide useful information for breeding suitable cultivation under conditions low soil fertility or with reduced fertilizer sustainable agriculture. Thirty-one were used, seedlings grown 8 treatment conditions. effects natural variations embryo and/or endosperm size...
The pathogenicity of 331 blast isolates (Pyricularia oryzae Cavara) collected from different regions and ecosystems for rice cultivation in Bangladesh was evaluated by compatibility on 23 differential varieties (DV), each harboring a single resistance gene, susceptible ‘Lijiangxintuanheigu’ (LTH). A wide variation virulence found among the isolates, 267 races were classified using new designation system. Virulence against DV carrying genes Pia, Pib, Pit, Pik-s, Piz-t, Pi12(t), Pi19(t),...
Ninety‐eight backcross inbred lines (BC1F6) developed between Nipponbare, a japonica rice, and Kasalath, an indica rice were employed to detect putative quantitative trait loci (QTLs) associated with the contents of cytosolic glutamine synthetase (GS1; EC 6.3.1.2) NADH‐glutamate synthase (NADH‐GOGAT; 1.4.1.14) in leaves. Immunoblotting analyses showed transgressive segregations toward lower or greater these enzyme proteins lines. Seven chromosomal QTL regions for GS1 protein content six...
Twenty near-isogenic lines (NILs) of rice (Oryza sativa L.) containing 11 blast resistance genes (Pib, Piz-5, Pi9, Pi3, Pia, Pik-s, Pik, Pik-h, Pi7(t), Pita and Pita-2) were developed by recurrent backcrossing 19 donor varieties to a susceptible Japonica-type variety, Lijiangxintuanheigu (LTH). The resistant plants selected in each backcross generation using specific avirulent isolate for targeted gene. NILs showed similar reaction patterns those the corresponding resistance-containing...
Quantitative trait loci (QTLs) that affect sink size and ripening, which are often negatively correlated, were analyzed in two inbred lines of rice (Oryza sativa L.) derived from crosses between the semi-dwarf indica japonica cultivars. Recombinant (RILs) Milyang23 (indica)/Akihikari (japonica), back-crossed (BCILs) Sasanishiki (japonica)/Habataki(indica)//Sasanishiki///Sasanishiki studied over a period years. A major QTL was related to number spikelets per panicle found same region...
The IRRI-Japan Collaborative Research Project has been developing new sets of differential varieties for resistance to blast disease (Pyricularia grisea Sacc.) in rice (Oryza sativa L.). first international standard variety set composed monogenic lines 24 kinds genes (Pia, Pib, Pii, Pik, Pik-h, Pik-m, Pik-p, Pik-s, Pish, Pit, Pita, Pita-2, Piz, Piz-5 (= Pi2), Piz-t, Pi1, Pi3, Pi5(t), Pi7, Pi9, Pi11(t), Pi12(t), Pi19(t), and Pi20) was released widely used various countries. Furthermore, the...
With 2 figures and 4 tables Abstract Gene pyramiding is considered one of the most effective strategies for achieving durable resistance against blast disease ( Magnaporthe oryzae B. Couch) in rice Oryza sativa L.), although few studies have evaluated combining effect genes. We report development pyramided lines with two major genes, Pish Pib , evaluation them. The genes were selected from progenies a cross between near isogenic line (NIL), which harbours another NIL, genetic background...
The evaluation of a total 122 blast (Pyricularia oryzae Cavara) isolates collected from the Tonle Sap and Mekong river regions Cambodia revealed wide variation. Using new designation system, were categorized into 92 races based on reaction patterns rice (Oryza sativa L.) differential varieties (DVs) harboring 23 resistance genes 1 susceptible cultivar, Lijiangxintuanheigu (LTH). Cluster analysis was used to classify 3 groups — I, IIa, IIb using data these DVs LTH. We classifications...
In total, 310 rice blast (Pyricularia oryzae Cavara) isolates from Japan showed wide variation in virulence. Virulence on (Oryza sativa L.) differential varieties (DV) harboring resistance genes Pish, Pia, Pii, Pi3, Pi5(t), Pik-s, and Pi19(t) ranged 82.9 to 100.0%. contrast, virulence DV possessing Pib, Pit, Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Pi9(t), Piz, Piz-5, Piz-t, Pita-2, Pita, Pi12(t), Pi20(t) 0 21.6%. Cluster analysis using the reaction patterns of classified into three groups: I,...
One hundred and ninety-one recombinant inbred lines (RILs) (F7) derived from a cross between Milyang 23 (M23) Akihikari (AK) were grown in 1997 Joetsu, Japan (temperate zone), during the 2000-01 dry wet seasons (four consecutive seasons) Los Baños, Philippines (tropical zone) to detect quantitative trait loci (QTLs) for flag leaf length, width angle (FLL, FLW FLA) of rice (Oryza sativa L.). The detected QTLs suggested that development was influenced by nine genomic regions categorized into...
The effects of the Oryza sativa calcium/calmodulin-dependent protein kinase OsCCaMK genotype (dominant homozygous [D], heterozygous [H], recessive [R]) on rice root-associated bacteria, including endophytes and epiphytes, were examined by using a Tos17 mutant line under paddy upland field conditions. Roots sampled at flowering stage subjected to clone library analyses. relative abundance Alphaproteobacteria was noticeably decreased in R plants both conditions (0.8% 3.0%, respectively) those...
Abstract Background Root system architecture is an important trait affecting the uptake of nutrients and water by crops. Shallower root systems preferentially take up from topsoil help avoid unfavorable environments in deeper soil layers. We have found a soil-surface rooting mutant M 2 population that was regenerated seed calli japonica rice cultivar, Nipponbare. In this study, we examined genetic physiological characteristics mutant. Results The primary roots showed no gravitropic response...