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Eco-physiological and genetic study of effects arbuscular mycorrhizal fungi on rice growth (2020-22, MEXT)

  • アーバスキュラー菌根 arbuscular mycorrhiza

  • 共生 symbiosis

1 菌根菌と根の研究

       Mycorrhiza and root study

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2. 水不足と稲 Rice under water limitation

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  • 節水栽培 Water-saving cultivation

  • 耐乾性 Drought resistance

*Development and adoption of Latin American Low-input Rice Production System through Genetic Improvement and Advanced Field-Management Technologies (SATREPS 2014-18) www.jst.go.jp/global/kadai/h2505_colombia.html
Rice is dry-direct seeded without puddling by making contour levee (called ”taipa”) in Colombia, which uses a lot of irrigation water and synthetic fertilizers. We study to develop water-saving and nitrogen use-efficient rice cultivation techniques by agronomic and breeding approaches.

*Ecophysiological and genetic studies on drought response index (DRI) among cereal crops (Kaken 2011-2014)
To clarify physio-morphological characters and genetic architectures of adapted genotypes under water limiting environments, rice and other cereal crops are evaluated for their drought response index (DRI), in terms of its eco-physiological and genetic basis. DRI had been studied as a selection index in conventional breeding programs for pearl millet and rainfed lowland rice. DRI is a synthetic index of putative drought resistance traits which are not explained by yield potential or phenology. This project clarified eco-physiological and genetic basis for DRI among rice. For many developing countries which may not afford to introduce biotechnology soon, DRI can be used more effectively for crop improvement in drought-prone agricultural areas within the framework of conventional breeding.

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*Studies on variety selection and regional heterogeneity of fragile rice ecosystems in Asia (Kakenhi 2016-19)
Field survey to clarify variability of natural environmental conditions and distribution of production risks within the target fragile rice ecosystems in selected Asian countries (Cambodia, India, Vietnam). Diversity and heterogeneity of management and production is to be understood by agro-ecological approach. Flood-prone Cambodian paddies, drought-prone Indian tank rice fields, salt-intruded Vietnamese delta paddies are being studied. How farmers’ selection of varieties and technologies are affected by environmental risks and profitability is being studied in the context of climate change and expanding rice marketing. The project aims to propose sustainable rice farming model in these fragile rice ecosystems.

*Agronomic study for site specific fertilizer management for nitrogen use efficient rice in Vietnam (Iijima Foundation 2016-17)
*Rice research and sustainability in Tamil Nadu, South India (AGS 2012-13)
*Strategy to enhance resilience to climate and ecosystem changes utilizing traditional bio-production systems in rural Asia (MOE 2011-13)
*Effects of climate variation・extreme climate on landscape perception of rural children in Southeast Asia (ANESC 2011)
*Development of model of improved rice farming and multifunctionality of rainfed lowlands with heterogeneous water environments in Cambodia) Development of model of improved rice farming and multifunctionality of rainfed lowlands with heterogeneous water environments in Cambodia (Kaken 2008-2011)

  • フィールド・農家調査 Field & farmer survey

  • 食糧農業統計解析(Food and Agricultural statistics analysis)

  • 栽培・品種 Cultivation, varieties

  • 生産技術選択 Choices of production technologies by people Drought resistance

3. 世界の持続可能な稲作の調査研究 Sustainable rice production in the world

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Regional comparative studies for sustainable rice seed production systems aim to establish a seed production system that can appropriately use and manage the results of commercialization and technological innovation without impairing the public goods. Seed production is indispensable for agriculture, but it is often taken as granted, with less consideration as a research topic.  It is also not easy to overview the current state of rice seed production in Japan including a comparison between prefectures. In this study, we collected quantitative data on the sources of rice seed production and the process of seeding business, and conducted a case study of comparison between prefectures, public-private sector, and internationals. 

  • 公的種子生産 formal seed production

  • 原種・原原種 registered seed and foundation seed

  • 種子法・種苗法 Main Crop Seed Act, Plant Variety Protection and Seed Act

4 稲種子生産の比較研究

  Comparative study on rice seed production

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