Dr. TSUJIMOTO Yasuhiro, Project Leader of the “Africa rice farming system” project, and colleagues from the Crop, Livestock and Environment Division received the 20th Japanese Society of Crop Science Best Paper Award for the paper titled "AZ-97 (Oryza sativa ssp. Indica) exhibits superior biomass production by maintaining the tiller numbers, leaf width, and leaf elongation rate under phosphorus deficiency".
As part of the Easy Science and Technology Seminar organized by the Japan Prize Foundation, a video featuring a research project in Madagascar in which Dr. NISHIGAKI Tomohiro, Researcher in the Crop, Livestock and Environment Division of JIRCAS, is participating has been released in the Foundation’s website and YouTube.
- Pick UpSoils have a unique property called "phosphorus (P) retention capacity," which refers to their ability to bind with phosphates. When soil has a high P retention capacity, the P fertilizer applied in a cropland may bind to the soil before being absorbed by crops. This reduces the efficiency of fertilization. Therefore, P retention capacity is used for fertilization management. Recent studies have shown a close relationship between P retention capacity and soil moisture content. A research team from JIRCAS and the University of Antananarivo in Madagascar used this relationship to develop a method that accurately and easily estimates P retention capacity from soil moisture content, including a clever use of table salt (sodium chloride).
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563. Discovered Rice Gene Region Associated with Low Soil Fertility Tolerance in Small Farm Conditions in Madagascar
Rice is Madagascar's staple food, and the per capita rice consumption is among the highest in the world. In Madagascar, rice is mainly cultivated by smallholders in low fertility soils with no external inputs such as mineral fertilizers. As a result, rice productivity remains low and the gap between rice production and consumption is widening at the national level. We have evaluated genetic resources from the International Rice Research Institute (IRRI) genebank, and identified loci associated with low soil fertility tolerance for total panicle weight per plant, straw weight, total plant biomass, heading date and plant height. A donor carrying total panicle weight loci was identified and crossed to a local variety, to initiate variety development through a combination of marker-assisted selection with selection on-farm to improve rice yield under local cultivation conditions.
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556. Genomic Prediction of Zinc Biofortification Potential in 3000 Gene Bank Accessions to Increase Grain Zinc Concentrations in Rice
The approach of increasing zinc (Zn) concentrations in edible parts of food crops (Zn-biofortification) is a global breeding goal to alleviate Zn malnutrition, which particularly affects small children that need it for proper development. Because the Zn concentration in polished rice is usually too low to provide a sufficient proportion of the daily Zn intake, Zn deficiency is widespread in households where rice is the staple food and where people cannot afford to diversify their diet by adding mineral-rich fruits, vegetables, and meat. We used a genomic prediction model to predict Zn concentrations in 3000 genetic resources and selected potential high-Zn donors for experimental validation and subsequent biofortification breeding in Madagascar.
- Pick UpMalnutrition has major lifelong consequences for children. In this issue, we present a paper that looks at the diversity of agricultural production, food diversity, and its impact on children's nutritional status in rural Madagascar, looking at the diversity of each farmer's agricultural production, food diversity, and its impact on children's nutritional status.
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The World Vegetable Center (WorldVeg) is leading a study aimed at understanding the diversity of traditional African vegetables used by Malagasy farmers, assessing their conservation status, and exploring opportunities for income generation and increased consumption. Details of the study supported by the Darwin Initiative are presented in an article by Ritha Luoga and Sognigbe N'Danikou published in the WorldVeg website.
国立研究開発法人国際農林水産業研究センター, 広報JIRCAS. 9 ( )
国立研究開発法人国際農林水産業研究センター, JIRCAS News. 90 ( )
Japan International Research Center for Agricultural Sciences, JIRCAS Newsletter. 90 ( )
Japan International Research Center for Agricultural Sciences, JIRCAS Newsletter. 89 ( )
国立研究開発法人国際農林水産業研究センター, JIRCAS News. 89 ( )
TICAD8 Official Side Event “Managing African Soil for Food Security and Environmental Sustainability” - Opportunities and Challenges of Agronomy to Solve Low Fertility/Nutrient Bottlenecks -Registration period:- (JST)
- Selection of a promising donor for developing zinc-biofortified rice based on genomic prediction model(2022)
- Increased lowland rice yield improves nutrition of farmers in Madagascar(2022)
- Increase of rice yield in response to phosphorus fertilizer application can be predicted by soil phosphorus retention capacity(2021)
- A model for estimating soil phosphorus availability in diverse tropical ecosystems by deep learning(2021)
- Efficient phosphorus application strategy to improve rice yields under cold stress-prone and P-deficient environments(2021)
- Introducing a quantitative trait locus, MP3, improves rice panicle numbers in nutrient-poor soils(2020)
- Dipping rice seedlings in phosphorus (P)-enriched slurry at transplanting increases yield and avoids cold stress under P-deficient soils in the tropics(2020)
- Soil phosphorus availability for rice plants can be rapidly estimated by laboratory visible and near-infrared spectroscopy(2019)
- Limited Si-nutrient status of rice plants in relation to plant-available Si of soils, nitrogen fertilizer application, and rice-growing environment across Sub-Saharan Africa(2013)