Research
Theme
1. Mycorrhiza and root study
Research
Keyword
I was fascinated by the symbiotic world of roots and microorganisms when I studied the improvement of root systems in crops under Research Theme 2.
Eco-physiological and genetic study of effects arbuscular mycorrhizal fungi on rice growth (2020-22, Kakenhi C)
The symbiosis between rice and arbuscular mycorrhizal fungi (AM fungi) was investigated to determine how the formation of the symbiotic system and crop productivity of AM fungi in rice plants are affected by changes in media moisture, and whether genetic variation in rice root traits affects the symbiotic relationship between AM fungi and rice plants.
Research Report https://kaken.nii.ac.jp/ja/file/KAKENHI-PROJECT-20K05995/20K05995seika.pdf
Crop improvement study on inter- and intra- specific variation in infection of arbuscular mycorrhizal fungi (2023-27, Kakenhi B, 23H02192)
Research is currently underway for crop infection dynamism, intra- and inter-species variation, utilization of inoculants! Please contact me if you are interested!
Research output up to now
Effects of water regime and inoculation with arbuscular mycorrhizal fungi on mycorrhizal communities of roots of rice and pearl millet in upland and lowland fields. Y P, Ohtomo R, Kamoshita A. (2024). Plant Root 18：10-21. https://doi.org/10.3117/plantroot.18.10
Effects of arbuscular mycorrhizal fungi inoculation on infection and growth of rice and pearl millet in upland fields with three water regimes. Y Phoura, Ryo Ohtomo, Hiromi Nakanishi & Akihiko Kamoshita (2023) Plant Production Science 26, 350–363. DOI: 10.1080/1343943X.2023.2251181
Arbuscular mycorrhiza
Symbiosis
Contents
Research
Theme
2. Water shortage and rice
Research
Keyword
Water-saving cultivation
Drought resistance
Contents
In the vast Australian state of Queensland, sorghum and wheat are grown under rain-fed conditions, but there has been a need for management and technological development to deal with changes in precipitation and fertility. In Asia, rice, which is suited to the monsoon climate, is grown in various countries, and a variety of ecosystems can be seen, but water shortages are often a major problem under rain-fed conditions. Rice cultivation has expanded to Africa and the Americas, where water management and technological development to deal with water shortages are also important issues.
*Development and establishment of resource-saving rice cultivation in Latin America through genetic improvement and advanced field management techniques (SATREPS 2014-18)
(Development and adoption of Latin American Low-input Rice Production System through Genetic Improvement and Advanced Field-Management Technologies) www.jst.go.jp/global/kadai/h2505_colombia.html
In Colombia, direct seeding cultivation with no puddling is common, but irrigation and large amounts of chemical fertilizer are used. Therefore, we quantified water productivity and nitrogen use efficiency, and conducted research to improve resource use efficiency.
*Physiological, genetic and ecological elucidation of drought response index of grains (JSPS 2011-2014)
(Ecophysiological and genetic studies on drought response index (DRI) among cereal crops)
In order to clarify the adapted varieties and genotypes in drought-prone areas of rain-fed agriculture in developing countries, we performed physiological, genetic and ecological analysis of the "drought response index (DRI)" of grains such as rice. DRI has been focused on as a selection index for drought resistance in pearl millet and rice in traditional breeding methods, and is considered to be an index of drought resistance that cannot be explained by yield potential or phenology. It is relatively easy to introduce DRI even in many developing countries where it is difficult to quickly introduce high technology.
Research Results
Eco-Physiological and Genetic Basis of Drought Response Index in Rice—Integration Using a Temperate Japonica Mapping Population. Ramalingam P, Nguyen ATH, Kamoshita A. (2024). Agronomy 14(10):2256. https://doi.org/10.3390/agronomy14102256
Evaluation of rice breeding lines containing root QTLs under different water management environments. Deshmukh V, Kamoshita A, Amézquita N, Espinosa N, Ogawa S, Kitomi Y, Uga Y. (2024). Plant Root 18 22-34. Ecophysiology of drill-seeded rice under reduced nitrogen fertilizer and reduced irrigation during El Niño in Central Colombia. Deshmukh V, Kamoshita A, Lopez-Galvis L, Pineda D. 2021.Plant Production Science, 24, 418-432.
Research
Theme
Research Keyword
＊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)
Examples of research outputs
Factors influencing the carbon footprint of rice production in Northeastern Vietnam. Nguyen TBY, Kamoshita A. (2024) Int J Life Cycle Assess https://doi.org/10.1007/s11367-024-02308-8
On-farm agronomic manipulations to improve rice (Oryza sativa L.) production in the saline coastal zone of the Red River Delta in Vietnam．Phan Luyen & Akihiko Kamoshita (2023) Plant Production Science, 26:3, 209-224, DOI: 10.1080/1343943X.2023.2215448
Recent changes in rice production in rainfed lowland and irrigated ecosystems in Thailand. Suwanmontri P, Kamoshita A, Fukai S. 2021. Plant Production Science, 24, 15-28.
Residual effects of cultivation methods on weed seed banks and weeds in Cambodia. Kamoshita A, Ikeda H, Yamagishi J, Lor B, Ouk M. 2016. Weed Biology and Management, 16, 93–107.
Field level damage of deepwater rice by the 2011 Southeast Asian Flood in a flood plain of Tonle Sap Lake, Northwest Cambodia. Kamoshita A, Ouk M. 2015. Paddy and Water Environment, 13, 455-463.
Weed biodiversity and rice production during the irrigation rehabilitation process in Cambodia. Kamoshita A, Araki Y, Nguyen YTB. 2014. Agriculture, Ecosystem and Environment, 194, 1-6.
Field & farmer survey
Food and Agricultural statistics analysis
Cultivation, varieties
Choices of production technologies by people Drought resistance
3. Research on sustainable rice production in the world
Contents
Research
Theme
4. Comparative study of seed production
Comparative study on seed production
Research
Keyword
Public seed production
Registered seeds and foundation seeds
Main Crop Seed Act, Plant Variety Protection and Seed Act
Smart seed production
Contents
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 public goods. Seed production is indispensable for agriculture, but it is often taken for 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. It is envisioned to conduct a scenario analysis of the future variability of seed production for each region and for individual varieties and sources.
Research Results:
Current Status and Issues of Rice Seed Production after the Repeal of the Major Crop Seed Law in Japan. Mizuho Fujii and Akihiko Kamoshita. Jpn. J. Crop Sci. 93(2):140-154 (2024). https://www.jstage.jst.go.jp/article/jcs/93/2/93_140/_pdf/-char/en
