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JIRCAS Mail Magazine No. 41 (March 2023)
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March 21 was “International Day of Forests”.
The theme for 2023 is "Forests and health".

The JIRCAS Forestry Division is conducting research and development with domestic and overseas research institutions.
In addition, from this fiscal year, JIRCAS has been conducting the SATREPS project “Strengthening Tropical Forest Resilience Based on Management and Utilization of Genetic Resources Capable of Climate Change Adaptation” in Indonesia.
https://www.jircas.go.jp/en/satreps-indonesia

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■ Latest Topics
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● PR Videos of JIRCAS Fifth Medium to Long-Term Plan Now Available
The PR videos for the JIRCAS 5th Medium to Long-term Plan (FY2021-2025) are now available and can be accessed from the top page of the JIRCAS official website and on the JIRCAS YouTube channel.
https://www.jircas.go.jp/en/reports/2022/r20230309

● PANOMICS Approach Contributes to the Advancement of BNI Research
The PANOMICS approach is a new method of exploring interactions that combines multiple omics analyses.
It is expected to elucidate plant-soil microbial interactions in biological nitrification inhibition (BNI).
https://www.jircas.go.jp/en/release/2022/press202222

● Indonesia’s Padjadjaran University Faculty and Students Visit JIRCAS
Padjadjaran University is the Indonesian counterpart of the SATREPS project “Strengthening Tropical Forest Resilience Based on Management and Utilization of Genetic Resources Capable of Climate Change Adaptation” from FY2023.
https://www.jircas.go.jp/en/reports/2022/r20230301

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■ New Technologies and Research Outputs
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In connection with International Day of Forests 2023,  we would like to introduce JIRCAS research on forestry.

● Elucidating the Leaf Vein Structure and Function of Tropical Rainforest Trees (Press Release)
Trees with well-defined veins have high photosynthesis and leaf defense, and are better adapted to light environments, while trees with unclear veins are better adapted to dark environments near the ground surface. Understanding of leaf vein structure contributes to the selection of tree species suitable for the environment and to the implementation of afforestation based on functional characteristics of tree species.
https://www.jircas.go.jp/en/release/2022/press202221

● Relationship between leaf and stem growths of a tropical timber tree, /Shorea leprosula,/ in the family Dipterocarpaceae
In /Shorea leprosul/a, a Dipterocarpaceae tree, we found that stems and leaves grow in synchrony, but that leaf excision markedly suppresses stem elongation.
Elucidation of this regulatory mechanism is expected to be useful for timber production and the stable supply of appropriately sized seedlings.
https://www.jircas.go.jp/en/publication/research_results/2021_a07

● Teak growth doubles in the Lao Mountains depending on the control of stand density and topographic conditions
The density of planted plantings in teak plantation and the choice of slope on which to plant can make a doubling difference in growth of teak trees.
The lower part of a concave gentle slope is most recommended as a suitable site, and it is clear that dense planting should be avoided for better growth.
https://www.jircas.go.jp/en/publication/research_results/2021_a08

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■ Publications
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● JIRCAS Newsletter No. 94
- JIRCAS International Symposium 2022
- JIRCAS in Action
https://www.jircas.go.jp/en/publication/jircas_newsletter

● JIRCAS International Agruculture Series No, 26
SALIBU Rice Ratoon Cropping Systems
-Unprecedented and sustainable high-yield rice-ratooning with the lowest use of time and resources-
https://www.jircas.go.jp/ja/publication/international_agriculture_series/26

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■ Call for Submissions
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To submit an article, please include your affiliation, name (anonymous is OK), and the title of the article to
koho-jircas@ml.affrc.go.jp
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https://www.jircas.go.jp/en/publication/jircas_mailmagazine_en

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【Edited and Published by】
Information and Public Relations Office
Japan International Research Center for Agricultural Sciences (JIRCAS)
1-1 Ohwashi, Tsukuba, Ibaraki 305-8686, Japan