SummaryThe objectives of this study are to compare the floret sterility induced by a high temperature given in daytime during flowering period among nine japonica rice varieties, and clarify mechanism high-temperature-induced sterility. Nine varieties were subjected 35.0, 37.5 or 40.0°C day- conditions (1000-1600) for six consecutive days using sun-lit phytotrons, percentage fertility, pollination germinated pollen grains on stigmas examined. The that caused 50% varied with variety,...

SummarySummaryTo clarify the mechanism of high temperature-induced floret sterility in rice (Oryza sativa L.), we studied effects temperature at flowering on ability thecae to dehisce and pollen-grain swelling which causes dehiscence. Two japonica cultivars, grown four L pots under submerged soil conditions were subjected (39°C) moderate (34°C) temperatures from 10 : 00 16 for three consecutive days stage. The percentage dehisced response artificial opening florets by removing lemma mean...

Prediction of crop yield and quality is an essential component successful implementation precision agriculture. Given the recent commercialization low-cost multispectral cameras mounted on unmanned aerial vehicles advances in machine learning techniques, prediction systems for characteristics can be more precisely developed using techniques. Therefore, model performances predicting wheat grain protein content between algorithms based spectral reflectance plant height (e.g. random forest...

Precise yield predictions are useful for implementing precision agriculture technologies and making better decisions in crop management. Convolutional neural networks (CNNs) have recently been used to predict yields unmanned aerial vehicle (UAV)-based remote sensing studies, but weather data not considered modeling. The aim of this study was explore the potential multimodal deep learning on rice prediction accuracy using UAV multispectral images at heading stage, along with data. effects CNN...

Crop yield prediction models are critical tools for evaluating growth performance and informing decisions during farm management. Developing that robust not only in the ranges of model spatial domain but also additional locations using a data-driven approach is challenging. The main objective this study was to investigate an appropriate cross-validation (CV) strategy establishing transferable UAV-based across different domains (i.e., meeting extrapolation mapping objectives). In study, we...

Although the impact of anticipated global warming on regional rice production merits intensive investigation, quantitative information regarding effects high temperatures japonica is limited. The purpose this study was to clarify critical temperature for temperature-induced spikelet sterility at time flowering in rices and how it affected by humidity wind velocity. This research consisted two experiments. In first experiment, we examined response varieties 'Akihikari' 'Koshihikari'...

Projected global warming is expected to increase the occurrence of heat-induced floret sterility (HIFS) in rice. However, there are few field-scale studies that could aid predicting potential risks rice yield and developing countermeasures against losses. The aim this study was elucidate factors induce under high temperature conditions during flowering season field condition China. Studies were conducted irrigated paddy fields with regional hybrid-rice cultivars grown Jianghan Basin where...

Even Under Extremely Hot (40ºC) Conditions During Anthesis, Heat-induced Floret Sterility Does Not Appear To Be A Serious Issue For Australian Rice Growers. This Contradicts Previously Reported Temperature Thresholds Sterility. Determine The Factors Associated With Stable Production and Dry in Riverina Region of New South Wales (Australia), We Examined (Cv. 'Langi') Pollination At Different Distances From Windward Edge Paddy Field Its Association Canopy Microclimate. An Air 34.5ºC Relative...

Anticipated global warming may increase the floret sterility of rice (Oryza sativa L.). For selection genotypes tolerant to high temperatures during flowering period, it is important identify morphological traits associated with tolerance temperature stress. This study investigated relationship between length dehiscence at basal part thecae and viability pollination in 18 cultivars subjected a hot-and-humid condition (37/25 ˚C, day/night, >90% relative humidity) for three days flowering....

Flower opening in the early morning helps to avoid sterility of rice (Oryza sativa L.) caused by heat stress at anthesis. Although flower time (FOT) is under genetic control, it also affected weather, particularly air temperature (Ta). However, effects Ta, solar radiation (Rs), and vapor-pressure deficit (VPD) on FOT are unclear, making difficult predict FOT. Therefore, we investigated correlation with Rs, VPD during various periods before anthesis field conditions. By photographing...

Global warming may reduce rice yield through poor pollination caused by high temperatures at flowering. The dominant parameter controlling the stability in cultivars was studied. We examined effects of a daytime temperature (35.0ºC, 37.5ºC, 40.0ºC) and its duration (1, 3, 5 days) on percentage dehisced thecae, length dehiscence basal part theca for pollen dispersal, stability. sufficiently pollinated florets (%SPF) decreased with increase treatment. At %SPF varied widely among highly...

As one of the most important crops, rice provides major food for more than half world population. However, its production is limited by many environmental factors, among which high temperature stress (HS) frequently occurs during anthesis and reduces spikelet fertility. To explore mechanism HS tolerance in rice, we conducted a comparative proteomics analysis on anthers between resistant sensitive cultivars under different levels temperature. Under same treatment, cultivar showed much higher...

Abstract To obtain basic information for rational site-specific soil management rice production, spatial variability of chemical properties and grain yield was evaluated in a 50 m × 100 paddy field. One hundred surface samples were collected from each the 5 10 plots before puddling to investigate their properties: pH, EC, total C content, N C/N ratio, contents mineralizable N, inorganic available P, exchangeable Ca, Mg, K, Na. Grain also measured at harvest corresponding plots....

Rice florets are susceptible to high-temperature damage at anthesis, but rice production remains stable in the Riverina region of Australia even when air temperature during flowering exceeds 40°C. To identify mechanism that supports under these conditions, we examined sterility and pollination relation microclimate panicle an extremely hot paddy field New South Wales. In windy > 40°C weather, was 38°C windward edge crop around 35°C inside crop, probably because strong transpirational cooling...

Predicted climate changes, in particular, the increased dimension and frequency of heat waves, are expected to affect crop growth future seriously. Hybrid rice relies on seed production from male sterile restorer lines. Experiments were conducted over two consecutive years compare high temperature tolerance parents different hybrid combinations, terms fertility rate, flowering pattern, pollination physiological parameters lodicule. Three lines a broad compatibility line (as pollen donor...

Abstract Countermeasures that can mitigate the global warming impact on rice production are needed. The large dehiscence of anther for pollen dispersal is one trait shows tolerance seed set to high temperatures under warming. aim this study determine effect long temperature tolerance. Seven chromosome segment substitution lines and parent with different lengths were subjected daytime temperatures. Elongation formed at base (BDL) by 100 µm mitigated occurrence induced sterility 20% improved...

The plant density of soybean is a critical factor affecting canopy structure and yield. Predicting the spatial variability would be valuable for improving agronomic practices. objective this study was to develop model measurement using several data sets with different resolutions, including unmanned aerial vehicle (UAV) imagery, PlanetScope satellite climate data. establishment process includes (1) performing high-throughput actual from UAV imagery You Only Look Once version 3 (YOLOv3)...

Abstract On-farm experimentation (OFE) is increasing worldwide. Appropriate OFE procedures may differ depending on the characteristics and circumstances surrounding farms, such as climate, field conditions, farm size, degree of agricultural digitalization, a farmer’s socioeconomic background. This study aims to guide future development in Japanese grain farming by examining experimental setup, data analysis, farmers’ activities within their institutional communication learning networks. The...

Dividing soybean ( Glycine max (L.) Merr) yield into several components, including the seeds per area and seed weight, offers better identification of driver variation, especially that is affected by environmental factors. The objectives this study are to understand relationship among yield, factors using a hierarchical Bayesian model, determine potential limiting for production. A approach natural mechanism eco-biological system through multi-level model. Precipitation data was used...