Takeshi Horie's research while affiliated with Kyoto University and other places

Publications (98)

Article
Full-text available
Recent studies have focused on the improvement of rice productivity under aerobic conditions for times when water resources and food production are limited. This study aimed to evaluate the adaptability of high-yielding rice cultivars to moderately water-stressed upland conditions in order to contribute breeding. A three-year field experiment in th...
Article
Full-text available
Since ancient times, rice has been a staple food in monsoon Asia, an area in Asia which is strongly affected by monsoon activity and home to a dense population comprising many millions of individuals. Since rice is usually produced by a given country to feed its own population, production variability is commonly analysed on a country-by-country bas...
Article
The objective of this study was to identify physiological processes that result in genotypic and N fertilization effects on rice yield response to elevated atmospheric CO2 concentrations ([CO2]). This study conducted growth and yield simulations for 9 rice genotypes grown at 4 climatically different sites in Asia, assuming the current atmospheric [...
Article
In the tropical mountains of Southeast Asia, slash-and-burn (S/B) agriculture is a widely practiced and important food production system. The ecosystem carbon stock in this land-use is linked not only to the carbon exchange with the atmosphere but also with food and resource security. The objective of this study was to provide quantitative informat...
Article
The objective of this study was to develop a whole-process model for explaining genotypic and environmental variations in the growth and yield of irrigated rice by incorporating a newly developed sub-model for plant nitrogen (N) uptake into a previously reported model for simulating growth and yield based on measured plant N. The N-uptake process m...
Article
Full-text available
In northern Laos, weeds are a major constraint to upland rice production in slash-and-burn systems. Two experiments were conducted to assess genotypic variation in ability to recover from weed competition at the early vegetative stage. Three traditional and two improved (IR 55423-01 and B6144F-MR-6-0-0) cultivars were grown with or without maize as...
Article
The objective of this study was to develop a mechanistic model for simulating the genotypic and environmental variation in rice growth and yield based on measured plant N accumulation. The model calibrations and evaluations were conducted for rice growth and yield data obtained from a cross-locational experiment on 9 genotypes at 7 climatically dif...
Article
Traditional tropical japonica genotypes (Oryza sativa) are typically grown without fertilizer for subsistence in slash-and-burn systems by resource-poor farmers in northern Laos. Recent short fallows have reduced soil fertility and rice productivity in these systems. Genotypes adapted to a range of soil fertility conditions are needed for their foo...
Article
Full-text available
The system of rice intensification (SRI) developed in Madagascar in the 1980s has been promoted as an integrated crop and resource management approach to rice-cultivation, especially for resource-limited smallholder farms. While advocates have claimed that SRI could boost rice yields with less external input, many criticisms have challenged its eff...
Article
The objective of this study was to investigate the effect of biochar application (CA) on soil physical properties and grain yields of upland rice (Oryza sativa L.) in northern Laos. During the 2007 wet season, three different experiments were conducted under upland conditions at 10 sites, combining variations in CA amounts (0–16 t ha−1), fertilizer...
Article
Estimation of respiratory parameters, such as maintenance coefficient and growth conversion efficiency, is important for simulating crop growth. The objective of this study was to estimate respiratory parameters for rice (Oryza sativa L.) by model analysis based on long-term and intermittent measurement of canopy CO2 exchange rate (CER) in the fiel...
Article
Full-text available
The rice-stylo (Stylosanthes guianensis) relay-intercropping system in paddy fields has previously been shown to increase agricultural productivity in Northeast Thailand, but successive relay-intercropping conducted without irrigation and fertilization during the stylo cropping has resulted in reduced production of stylo. The aim of this study was...
Article
The objectives of this study are to propose a model for explaining the genotypic and environmental variation in above-ground biomass growth via photosynthesis and respiration processes from transplanting to heading for different rice genotypes grown under a wide range of environments, and to identify the physiological traits associated with genotyp...
Article
Full-text available
We evaluated the usefulness of the Stylosanthes guianensis (stylo)- rice relay-intercropping system for increasing agricultural productivity in Northeast Thailand. Although large production variability was observed, the relay-intercropping system produced an average of 350 g m(-2) stylo dry matter during the dry season under non-irrigated and non-f...
Article
A number of field trials on rice productivity have demonstrated very high yield, but reported limited information on environmental factors. The objective of this study was to reveal the environmental factors associated with high rice productivity in the subtropical environment of Yunnan, China. We conducted cross-locational field experiments using...
Article
Full-text available
In the afternoon when air humidity decreases, leaf photosynthetic rate (P-n) often declines in rice grown under irrigated conditions. To clarify the genotypic difference of P-n in response to humidity, we measured P-n and stomatal conductance (g(s)) for nine rice varieties with diverse genetic backgrounds, at various vapor pressure differences (VPD...
Article
This study examined the use of satellite sensor imagery for chronosequential assessment of land use and ecosystem carbon stock in slash‐and‐burn (S/B) regions of Laos. The segmentation approach was useful because the boundaries of S/B patches are subject to change due to natural or anthropogenic factors. Polygon‐based classification using six optic...
Article
In order to evaluate genotypic variation, we measured leaf photosynthetic rate (Pn) and its associated factors for the rice diversity research set of germplasm (RDRS) selected from the Genebank in National Institute of Agrobiological Sciences (NIAS). Pn showed large genotypic variation from 11.9 to 32.1 micromol m(-2 )s(-1). The variation in stomat...
Article
Full-text available
Environmental resources for rainfed rice production show large variability even within a small area in Northeast Thailand, and it is said that farmer's management is well adapted to the variability. This study evaluated transplanting date and nitrogen (N) fertilizer rate in the management to improve rice productivity. The effect of transplanting da...
Article
In northern Lao People’s Democratic Republic, rising human population has drastically reduced the fallow period of slash-and-burn agriculture which has led to a considerable decrease in the carbon stock in these communities. We estimated chronosequential changes in the communities' carbon stocks, and established the relationship between the fallow...
Article
Crop physiological traits of Liangyoupeijiu, a “super” hybrid rice variety recently bred in China, were compared with those of Takanari and Nipponbare in 2003 and 2004 in Kyoto, Japan. Liangyoupeijiu showed a significantly higher grain yield than Nipponbare in both years, and achieved a grain yield of 11.8tha−1 in 2004, which is the highest yield o...
Article
Full-text available
We analyzed the contents and usefulness of the world surface data reported by Japan Meteorological Agency. The data includes daily values of climate, such as air pressure, temperature, precipitations and weather, at about 400 sites in the world from 1982 and about 3000 sites from 1999. However, the data includes neither solar radiation, nor sunshin...
Article
Full-text available
In recent Japan, the increasing summer temperature and its influence on rice production have been recognized. The change in management and cultivar to adapt to this warming trend is necessary to maintain the yield and quality of rice. In this study we quantified the changes of weather condition and their effects on the production of rice in Japan d...
Article
Full-text available
Stomatal conductance (g(s)) is an important trait responsible for the genotypic difference in gas diffusion for photosynthesis and transpiration in rice (Oryza sativa L.). We measured g(s), stomatal density and stomatal length (guard-cell length) at two weeks before heading for 64 accessions from a rice diversity research set of germplasm (RDRS) an...
Article
Leaf area index (LAI) is one of the major determinants of crop photosynthesis. The objectives of this study were to clarify the relationship between LAI development and crop growth in diverse rice genotypes grown under widely different climate conditions and to develop a model explaining genotypic and environmental variation in LAI dynamics based o...
Article
Identification of physiological traits associated with leaf photosynthetic rate (Pn) is important for improving potential productivity of rice (Oryza sativa). The objectives of this study were to develop a model which can explain genotypic variation and ontogenetic change of Pn in rice under optimal conditions as a function of leaf nitrogen content...
Article
Protein concentration of grain is an important quality index of rice, and formation of grain protein largely depends on pre-anthesis nitrogen assimilation and post-anthesis nitrogen remobilization in the rice plant. The primary objective of this study was to develop a simplified process model for simulating nitrogen accumulation and remobilization...
Article
Understanding indigenous knowledge of soils has come to be seen as essential in understanding the local realities of farmer and may be critical for the success or failure of agricultural development. However, little effort has been made to capture the indigenous knowledge of upland farmers in northern Laos where many projects are working to develop...
Article
Excess applications of chemical fertilizer give adverse effects on regional ecosystems and environment. We studied the effects of mulberry leaves grown at different fertilizer application rates, including long-term unfertilized cultivation, on the susceptibility of silkworm larvae to a food dye, phloxine (C.I. Acid Red 92), which is also known as a...
Article
Carbon isotope discrimination (Delta) occuring in the process of photosynthesis, shows variation among rice (Oryza sativa L.) cultivars. Elucidation of specific traits associated with the extent of this discrimination under irrigated conditions may be useful to improve photosynthetic ability in rice plants. We measured leaf photosynthesis and Delta...
Article
Rice (Oryza sativa L.) yield is closely related to the number of spikelets per unit area which varies with the genotype and environment. The objectives were to identify plant factors associated with genotypic and environmental variations in spikelet number and to develop a model that may explain the variations based on plant factors. Two-year cross...
Article
There have been few practical ways of measuring physiological determinants of rice yield. Rapid evaluation of yield determination traits may expedite breeding of high-yielding rice. Here, we report a new remote-sensing technique for the evaluation of canopy ecophysiological status under field conditions developed based on simultaneous measurements...
Article
Total nitrogen and total carbon contents of the soil and the leaf yield in a long-term unfertilized mulberry field (NF) were compared with those in a chemically fertilized field (F) for 19 years from 1985 to 2003. Each year, 30, 20 and 20g m-2 of nitrogen, phosphorus and potassium, respectively, were applied to the F field; a half in spring and the...
Article
Northeast Thailand is one of the representative rainfed rice culture areas in Asia, where rice productivity is limited not only by unstable rainfall but also by poor soil. The objective of this study was to improve rainfed rice yield at degraded fields in upper toposequence by incorporation of sediment soil accumulated at the lowest toposequence in...
Article
Yield potential in rice has remained stagnant since the development of IR8 by International Rice Research Institute (IRRI), especially in tropical environments. We conducted field experiments in Kyoto, Japan (temperate climate) in 1999 and 2000 to determine the factors related to yield potential in rice. A rice cultivar Takanari showed the highest...
Article
To elucidate the major physiological process to cause genotypic variation in the seedling vigor of rice, we analyzed the dry matter accumulation in the seedling for diverse cultivars distinguishing hetero- and auto-trophic growth. Four cultivars in Exp. 1 and 63 cultivars in Exp. 2 were grown in a glasshouse by hydroponics for about three weeks. In...
Article
Inhibition of growth of reproductive organs by high temperature may be involved in the occurrence of delayed stem senescence (DSS) of soybean. Six soybean cultivars were grown in the Temperature Gradient Chambers (TGC) and in a field adjacent to the TGC and yield components and degree of DSS were measured for individual plants. Four temperature plo...
Article
Full-text available
Grain-filling is a crucial process that determines final grain yield in rice (Oryza sativa L.). To understand the genetic basis of dynamics of grain-filling, quantitative trait locus (QTL) analysis was conducted using time-related phenotypic data on grain-filling collected from a population of 155 recombinant inbred lines (F12), derived from a cros...
Article
Full-text available
Anticipated global warming may increase the floret sterility of rice (Oryza sativa L.). For selection of genotypes tolerant to high temperatures during the flowering period, it is important to identify morphological traits associated with tolerance to temperature stress. This Study investigated the relationship between the length of dehiscence at t...
Article
Full-text available
The annual rate of rice yield increase in the world declined from 2.7 % in the 1980s to 1.1 % in the1990s. The continued world population increase requires resumption of the previous rate. The objectives of this paper are to review and assess rice production technologies for increased yield in the past and the current challenge on the basis of crop...
Article
Drought is recognized as a primary constraint for rainfed rice production. In this study, the spatial distribution of heading date of rainfed rice and its relation to field water conditions were investigated for 2 years in mini-watersheds called Nong in Northeast Thailand, in order to clarify the toposequential variation in the degree of water stre...
Article
The critical developmental stage, during which the genotypic difference in yield is determined, was identified by analyzing the correlations between seed yield and seasonal crop dry matter productivity in optimally managed fields in four seasons. The fields (fluvial sandy loam or clay loam) were managed with irrigation, pest and weed control and ca...
Article
Full-text available
Mini-watersheds called Nong in Thai are geographical components of rainfed lowland rice culture in Northeast Thailand, and constitute distinct units in understanding environmental constraints for low and unstable rainfed rice production there. The toposequential variation of soil fertility and its relation to rice productivity within mini-watershed...
Article
Full-text available
In order to identify the key factors that arrest yield improvement in rice, we observed fifteen divergent cultivars in a field at Kyoto, Japan in 1995 and 2001 under various nitrogen (N) regimes. The contribution that sink size (spikelet number×single fully ripened grain mass), source size (total available carbohydrate), and source components, non-...
Article
Experiments were conducted in 1997 and 1999 to determine how long-term soil fertilization influences the performance of maize crop under water deficit on alluvial soil (sandy loam) at the Kyoto University Farm, Japan. The field had been applied large amounts of chemical fertilizer and/or farmyard manure since 1988 as four treatments, i.e., no ferti...
Article
A greenhouse experiment was conducted to compare root system development of two upland rice cultivars, IRAT 13 and Senshou, during recovery from drought stress and to identify to plant traits that confer drought resistance. From 62 days after sowing (62 DAS), drought stress was given for 6 d followed by rewatering for 14 d. Root length density (RLD...
Article
Full-text available
The objectives of this study are to compare the floret sterility induced by a high temperature given in the daytime during the flowering period among nine japonica rice varieties, and to clarify the mechanism of the high-temperature-induced sterility. Nine japonica rice varieties were subjected to 35.0, 37.5 or 40.0°C day- temperature conditions (1...
Article
Full-text available
Breeding for high-yielding rice has been directed toward those types that have a larger number of spikelets per panicle. The objective of this study was to examine the relationship within a cultivar between the size of the apical dome (AD) and the morphological characters of the panicle components such as the number of primary rachisbranches (PBs),...
Article
Full-text available
Anthers of rice cultivar, cv. Nipponbare, which showed floret fertility even when the temperature at flowering was high (tolerant) and cv. Hinohikari, which showed floret sterility at high temperatures (susceptible) were compared. The anther of Nipponbare had better developed cavities for dehiscence and thicker locule walls than Hinohikari, The wel...
Article
The fate of applied nitrogen (N) fertilizer in a barley-maize-barley crop sequence on an alluvial soil with four different histories of soil fertilization (main plots) was examined at Kyoto, Japan. The four main plots were not fertilized (NF), or fertilized with only chemical fertilizer (CF), only barnyard manure (MF) and chemical fertilizer + barn...
Article
Full-text available
Pricking or pressing an ovary can induce anther dehiscence in cleistogamous two‐rowed barley in the absence of lodicule swelling. This response is considered to be inherited from a chasmogamous ancestor in which anther dehiscence is induced by the stimulus given to the pistil by the lodicule swelling, which causes floret opening.
Article
To test the hypothesis that the rapid swelling of pollen grains driven by potassium movement opens the septum in anthers of poaceous plants, we studied (1) the behaviour of pollen grains during unfolding of the locule and (2) the distribution of potassium in the locule in two-rowed barley. In the first experiment, the unfolding...
Article
The role of rapid swelling of pollen grains in anther dehiscence in Hordeum distichum L. emend. L AM . and the mechanism of this swelling were examined. Artificial opening of the floret induced rapid swelling of pollen grains and thecae dehiscence. The theca dehisced as pollen grains became swollen and dehisced anthers had larger pollen grains than...
Article
Full-text available
To clarify the mechanism of high temperature-induced floret sterility in rice (Oryza sativa L.), we studied the effects of high temperature at flowering on the ability of thecae to dehisce and on pollen-grain swelling which causes thecae dehiscence. Two japonica rice cultivars, grown in four L pots under submerged soil conditions were subjected to...
Article
For improving nitrogen (N) use efficiency and yield of rainfed lowland rice, N management and cultivar experiments were conducted at Ubon Ratchathani, Northeast Thailand. In the N experiment, Khao Dawk Mali 105 (KDML105), one of the leading cultivars in Northeast Thailand, was grown under different N management methods including different N rates i...
Article
This paper presents a new explanation of the mechanism of anther dehiscence in rice during the period from floret opening to pollen dispersal. The theca dehisced on the stomium in the apical part and the anther wall in the basal part of the large locule. Comparison of the anther dehiscence process under various air humidity conditions showed that t...
Article
Full-text available
The changes in pollen grain diameter were examined in relation to the floret opening and anther dehiscence in rice (Oryza sativa L.). In the first experiment, the florets were artificially opened by excising the top of the glumes at various times before the expected natural flowering time. Pollen diameter increased rapidly in the artificially opene...
Article
To develop a rapid determination of nonstructural carbohydrate (NSC) in rice plant, the availability of gravimetric analysis was examined. A plant sample of 0.5 g in 30 mL of distilled water was heated on a hot plate. After the cooling, 20 mL of phosphate buffer (KH 2PO 4; 12.08 gL -1, Na 2HPO 4·12H 2O; 3.98 gL -1, NaN 3; 0.025 gL -1) containing 1....
Article
Full-text available
The effects of elevated CO2 concentration and high temperatures on transpiration and gaseous diffusive resistances of rice canopy were investigated. Akihikari and IR36 cultivars were grown under two CO2 concentrations ([CO2], 365 and 700 μL L-1) X three temperatures (29.8, 30.4: and 32.5°C on average over the experimental period), created by two Te...
Article
Field experiments were conducted to characterize intercropping advantages in groundnut-fingermillet intercrop in relation to crop combination ratios, soil moisture and nitrogen (N) availability. Three intercrops in 1 : 2, 1 : 1 and 2 : 1 alternating rows of groundnut and fingermillet were examined for their growth and yield in comparison with their...
Article
Full-text available
Although the impact of anticipated global warming on regional rice production merits intensive investigation, quantitative information regarding the effects of high temperatures on japonica rice is limited. The purpose of this study was to clarify the critical temperature for high temperature-induced spikelet sterility at the time of flowering in j...
Article
Understanding the processes controlling yield in well-managed, high-input crops may offer ways of increasing currently recognized yield potentials. In this study, 13 crops of Koshihikari rice were managed with different nitrogen strategies to achieve maximum yield in three environments, Kyoto (6 t ha−1) and Ina (10 t ha−1) in Japan, and Yanco (13 t...
Article
Most models that predict crop development based on temperature and photoperiod ignore critical changes in photothermal responses during crop ontogeny. A new, detailed model was developed to predict development to flowering in rice (Oryza sativa L.), based on the Beta function which is commonly used for skewed probability density functions in statis...
Article
The effects of increasing temperature and CO2 concentration on floral sterility were examined for rice (cv. IR 72) using open-top chambers located at the International Rice Research Institute in Los Banos, Philippines. The field-based open-top chamber system was used to simulate four different environments: ambient temperature and CO2 concentration...
Article
A detailed nonlinear model, the 3s-Beta model, for photothermal responses of flowering in rice (Oryza sativa L.) was evaluated for predicting rice flowering date in field conditions. This model was compared with other three models: a three-plane linear model and two nonlinear models, viz, the modified rice clock model (m-RCM) and a logistic model....
Article
Full-text available
The likely effects of climate change caused by increasing atmospheric carbon dioxide levels on rice production in Asia were evaluated using two rice crop simulation models, ORYZA1 and SIMRIW, running under ‘fixed-change’ climate scenarios and scenarios predicted for a doubled-CO2 (2 × CO2) atmosphere by the General Fluid Dynamics Laboratory (GFDL),...
Chapter
A dynamic crop growth model was developed to analyse irrigated paddy rice (Oryza saliva L.) productivity as determined by climatic factors and N availability. The model consists of submodels related to soil N processes, rice N-uptake, developmental processes, photosynthesis, dry matter production and spikelet formation. Soil N processes include N m...
Article
Long-term CO2 enrichment experiments under various temperature conditions on “Akihikari” rice were conducted using Temperature Gradient Chambers (TGCs) over 4 growing seasons (1992-1995). Measurements were made of crop biomass production, yield, and water use efficiency (WUE), and also of single leaf photosynthesis and transpiration, to evaluate in...