WEKO3
アイテム
Development Concept and Early Demonstration of Nitrogen-Use-Efficient Rice Varieties
https://doi.org/10.64096/gars-e.12
https://doi.org/10.64096/gars-e.122f16a2a0-f757-4e11-8112-1671cd57753a
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
gars-12_en (1.3 MB)
|
.png)
|
|
gars-12_en_Thumbnail (45.5 KB)
|
|
| アイテムタイプ | 国際農研デフォルトアイテムタイプ（フル）(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2026-03-27 | |||||||||
| タイトル | ||||||||||
| タイトル | Development Concept and Early Demonstration of Nitrogen-Use-Efficient Rice Varieties | |||||||||
| 言語 | en | |||||||||
| 作成者 |
Obara, Mitsuhiro
× Obara, Mitsuhiro （Author）
ORCID
0000-0002-3728-9050
× Sasaki, Kazuhiro （Author）
ORCID
0000-0001-7354-2167
|
|||||||||
| アクセス権 | ||||||||||
| アクセス権 | open access | |||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||
| 権利情報 | ||||||||||
| 権利情報 | ©Japan International Research Center for Agricultural Sciences (JIRCAS), 2026 | |||||||||
| 権利情報 | ||||||||||
| 権利情報Resource | https://creativecommons.org/licenses/by/4.0/deed/en | |||||||||
| 権利情報 | This is an open access work distributed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). Users may reuse, share, adapt, and build upon the original work under the license and the following conditions: Attribution—The original work must be clearly credited. Suggested citation: Obara, M., & Sasaki, K. (2026) Development concept and early demonstration of nitrogen-use-efficient rice varieties. Green Asia Report Series, No. 12. Japan International Research Center for Agricultural Sciences (JIRCAS), Japan. License: CC BY 4.0. https://doi.org/10.64096/gars-e.12 Third-party content—Users who wish to reuse material from this work that is attributed to a third party, such as tables, figures, or images, are responsible for determining whether permission is required for such reuse and for obtaining permission from the copyright holder. The risk of claims arising from infringement of any third party component of the work rests solely with the user. |
|||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | TableOfContents | |||||||||
| 内容記述 | Preface: iv Abstract: v 1. Current Status and Challenges of Nitrogen Fertilizer Use in Rice Cultivation in the Asia-Monsoon Region: 1 1.1: High-Yield Strategies and Environmental Impacts in the Asia-Monsoon Region: 1 1.2: Synthesis of Chemical Nitrogen Fertilizers and Environmental Impact: 1 1.3: Improving NUE: 2 1.4: Policies for Environmentally Harmonious Agriculture: 3 2. Developed Technologies for Improving NUE in Rice: 5 2.1: Background and Overview of Technological Development: 5 2.2: Effect of Early Heading on Dry Matter Accumulation: 6 2.3: Impact of Early Heading on Fertilizer Application: 7 2.4: Mechanism Behind Equivalent Yields with Lower Fertilizer: 9 2.5: Adaptability, Versatility, and Limitations of Technology for Policy Use: 11 3. Pilot Evaluation of NUE-Enhanced Rice Developed for Indonesia: 12 3.1: Development of NUE-Enhanced Lines Derived from Ciherang: 12 3.2: NUE-Improving Lines with Ciherang as the Background: 12 3.3: Methods and Trait Measurement Methods for Verification Trials: 12 3.4: Heading and Maturity Performance of NUE-Enhanced Lines in a Pilot Trial: 13 3.5: Yield Performance under Different Fertilization Conditions: 14 3.6: Verification of the Effect of Reducing Chemical Nitrogen Fertilizer Use: 15 4. Future Research Topics: 17 4.1: Multi-site validation and tuning: 17 4.2: Development of Application Area Determination Technology: 18 4.3 Deepening of Physiological Mechanisms: 18 5. Future Prospects for Technology Dissemination: 20 5.1: Advanced Breeding Techniques: 20 5.2: Demonstration of Multifaceted Benefits: 20 5.3: Policy Coordination: 21 5.4: Expansion into the Asia-Monsoon Region and the Global South: 21 Authors contribution statement: 22 Acknowledgement: 22 References:22 |
|||||||||
| 言語 | en | |||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | For several years, excessive chemical nitrogen fertilizers have been applied to the Asia-Monsoon region. Consequently, environmental challenges, such as groundwater pollution and greenhouse gas emissions, which sometimes lead to pest and disease proliferation, have emerged, making a shift toward sustainable rice cultivation imperative. One key technological challenge in achieving this is enhancing the nitrogen use efficiency (NUE). This report introduces technological developments that aim to achieve high yields with minimal fertilizer application, presents preliminary demonstration findings, and discusses future prospects. Fertilizer management and breeding are two major methods for enhancing NUE in rice cultivation. The latter can have substantial potential for social acceptance and widespread adoption if the development of varieties considers regionally specific environmental conditions. For instance, dry matter accumulation tends to stagnate during the heading stage in environments such as the Asia-Monsoon region, which is characterized by high temperature, high humidity, and frequent overcast conditions. Consequently, assimilation via photosynthesis during the reproductive stage plays a critical role in the yield. Therefore, developing varieties that maintain dry matter production during the reproductive stage is an effective strategy for enhancing NUE. While early heading has traditionally been considered detrimental to yield potential in breeding programs, recent breeding strategies have actively used early heading to avoid weather stresses such as high temperatures and drought during the reproductive stage. Furthermore, a shorter cultivation period resulting from early heading can decrease methane emissions and conserve irrigation water. Based on the hypothesis that efficient photosynthesis to maintain dry matter production during the reproductive stage results in enhanced NUE, we developed lines introducing early heading genes as part of the JIRCAS project (FY2016–FY2021). We developed NR160E, using the high-yielding Philippine variety NSIC Rc 160 as a background, by introducing an early heading QTL. Field trials in Japan indicated that NR160E maintained yield even at half the fertilizer application rate. Enhanced physiological NUE (PNUE) can be achieved by promoting photosynthesis during the reproductive stage and improving dry matter accumulation and yield components. However, the effect of the early heading gene in NR160E may be limited in low-latitude regions. Thus, using high-yielding varieties suited to each region's cultivation conditions as a genetic background is crucial when disseminating early heading technology in the Asia-Monsoon regions. In response to these difficulties, JIRCAS developed EHD10 and EHD16, which introduced various genes that produce early heading in low-latitude regions into the major variety Ciherang in Indonesia. Furthermore, preliminary verification tests in farmers' fields was conducted as part of the Green Asia Project. Under the recommended fertilization conditions, both lines showed yields 22%–25% higher than that of Ciherang and decreased nitrogen use by approximately 20%. Additionally, the yields of EHD10 and EHD16 were maintained even under no-fertilization conditions, overcoming the conventional problem of reduced yields owing to early heading. These preliminary findings indicate the potential for improved NUE by developing early heading varieties tailored to regional environmental conditions. Nevertheless, further evidence is necessary to promote the revision of fertilizer application regimes and the transformation of fertilization systems in the Asia-Monsoon region. |
|||||||||
| 言語 | en | |||||||||
| 出版者 | ||||||||||
| 出版者 | Japan International Research Center for Agricultural Sciences | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||||||
| 資源タイプ | research report | |||||||||
| 出版タイプ | ||||||||||
| 出版タイプ | VoR | |||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||
| ID登録 | ||||||||||
| ID登録 | 10.64096/gars-e.12 | |||||||||
| ID登録タイプ | Crossref | |||||||||
| 関連情報 | ||||||||||
| 関連タイプ | isPartOf | |||||||||
| 識別子タイプ | URI | |||||||||
| 関連識別子 | https://www.jircas.go.jp/en/greenasia/report | |||||||||
| 関連名称 | Green Asia Report Series | |||||||||
| 関連情報 | ||||||||||
| 関連タイプ | isIdenticalTo | |||||||||
| 識別子タイプ | ISBN | |||||||||
| 関連識別子 | 9784906635337 | |||||||||
| 書誌情報 |
en : Green Asia Report Series 巻 12, p. 1-22, 発行日 2026-03-25 |
|||||||||
| 助成情報 | ||||||||||
| 識別子タイプ | Crossref Funder | |||||||||
| 助成機関識別子 | https://doi.org/10.13039/501100003993 | |||||||||
| 助成機関名 | Ministry of Agriculture, Forestry and Fisheries (MAFF), Japan(en) | |||||||||
| 研究課題番号URI | https://www.affrc.maff.go.jp/kokusaikenkyu/asia-monsoon.html | |||||||||
| 研究課題名 | Accelerating application of agricultural technologies which enhance production potentials and ensure sustainable food systems in the Asia-Monsoon region(en) | |||||||||
| 助成情報 | ||||||||||
| 識別子タイプ | Crossref Funder | |||||||||
| 助成機関識別子 | https://doi.org/10.13039/501100009472 | |||||||||
| 助成機関名 | Japan International Research Center for Agricultural Sciences(en) | |||||||||
| 研究課題番号 | 05a1C5 | |||||||||
| 研究課題番号URI | https://www.jircas.go.jp/en/greenasia | |||||||||
| 研究課題名 | Green Asia(en) | |||||||||
