Faculty Profiles - ASHIKARI, Motoyuki

Papers - ASHIKARI, Motoyuki

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Triple florigenic signaling in rice promotes stem elongation via transcriptional de-repression Open Access

Vicentini, G; Bertagnon, G; Dobetti, F; Giaume, F; Cazzaniga, F; Baldini, A; Bono, GA; Maika, J; Moore, SS; Bignardi, A; Simon, R; Perrella, G; Nagai, K; Ashikari, M; Fornara, F; Brambilla, V

PLANT JOURNAL Vol. 127 ( 2 ) 2026.7

GA20ox1-mediated GA4 production promotes inflorescence stem growth in Arabidopsis via inner-layer cell proliferation Open Access

Mizushima, M; Matsumoto, K; Kojima, M; Takebayashi, Y; Kurotani, K; Mizutani, M; Xu, X; Sato, Y; Fukazawa, J; Uchida, N; Nagai, K; Nagano, AJ; Sakakibara, H; Ashikari, M; Takagi, H

PLANT AND CELL PHYSIOLOGY 2026.7

N-glucosylation of indole-3-acetyl amino acids modulates auxin metabolism and growth traits in Oryza sativa. International journal Open Access

Anna Zenji, Kimihiko Hata, Shoji Segami, Nobue Makita, Mikiko Kojima, Mika Yoshino-Kida, Keisuke Nagai, Motoyuki Ashikari, Kazuki Matsubara, Masahiro Yano, Shuichi Fukuoka, Ken-Ichiro Hayashi, Yutaka Sato, Tokunori Hobo, Yoshiaki Inukai, Hitoshi Sakakibara

Proceedings of the National Academy of Sciences of the United States of America Vol. 123 ( 12 ) page： e2527570123 2026.3

Language：English Publishing type：Research paper (scientific journal)

Dynamic regulation of auxin (indole-3-acetic acid; IAA) levels is crucial for proper plant growth and development and is finely regulated through biosynthesis, transport, metabolic inactivation, and signal transduction. While O-glucosylation of IAA is well established, the physiological significance of N-glucosylation pathways acting on IAA-amino acid conjugates remains largely unexplored. Here, we identify a UDP-glucosyltransferase in rice (Oryza sativa), designated IAAspGT, that catalyzes the N-glucosylation of indole-3-acetyl (IA) amino acid conjugates. Functional analysis revealed that natural allelic variants of IAAspGT differ markedly in enzymatic activity, with the high-activity allele prevalent in indica and the low-activity allele in japonica cultivars. Mutational analysis identified key residues within the glucose-accepting substrate-binding domain that account for this variation. A metabolic perturbation experiment demonstrated that IAAspGT competes with the DAO-mediated oxidation, thereby affecting active auxin levels. Plants harboring the high-activity allele exhibited enhanced root elongation under nutrient-deficient conditions and altered growth allocation between the panicle and other above-ground organs. Haplotype analysis indicated that the high-activity allele is ancestral and widely retained in the wild relatives. These findings establish IA-amino acid N-glucosylation as a previously overlooked metabolic branch that modulates auxin availability and contributes to environmental responses and growth plasticity in rice.

DOI： 10.1073/pnas.2527570123

Open Access

Web of Science

PubMed

Spatio-Temporal Regulation of Gibberellin Biosynthesis Contributes to Optimal Rhizome Bud Development

Bessho-Uehara, K; Omori, T; Reuscher, S; Nagai, K; Agata, A; Kojima, M; Takebayashi, Y; Suzuki, T; Sakakibara, H; Ashikari, M; Hobo, T

RICE Vol. 18 ( 1 ) 2025.12

Developmental Dynamics of Intercalary Meristem and Pith Cavity in Rice Stems Open Access

Nagai, K; Niimi, Y; Ohsato, M; Ashikari, M

RICE Vol. 18 ( 1 ) 2025.3

Surviving floods: Escape and quiescence strategies of rice coping with submergence

Ashikari, M; Nagai, K; Bailey-Serres, J

PLANT PHYSIOLOGY Vol. 197 ( 2 ) 2025.2

イネの分子育種を用いた食糧問題緩和へのチャレンジ Invited Reviewed

芦苅基行

農業および園芸 Vol. 100 ( 1 ) 2025.1

Leaf Gas Film 1 promotes glycerol ester accumulation and formation of a tight root barrier to radial O2 loss in rice

Jiménez, JD; Noorrohmah, S; Suresh, K; Zeisler-Diehl, VV; Ogorek, LLP; Herzog, M; Pellegrini, E; Nagai, K; Ashikari, M; Takahashi, H; Pedersen, O; Schreiber, L; Nakazono, M

PLANT PHYSIOLOGY 2024.9

Incorporation of Photoperiod Insensitivity and High-Yield Genes into an Indigenous Rice Variety from Myanmar, Paw San Hmwe

Win, KT; Hlaing, MM; Hlaing, ALL; Maung, ZTZ; Oo, KN; Nwe, T; Moe, S; Lin, T; Saw, OM; Aung, T; Swe, MS; Lar, S; Sin, ES; Yamagata, Y; Angeles, ER; Matsue, Y; Yasui, H; Thein, MS; Win, NK; Ashikari, M; Yoshimura, A

AGRONOMY-BASEL Vol. 14 ( 3 ) 2024.3

Identification of An7 as a positive awn regulator from two wild rice species

Mizutani, M; Murase, R; Aoki, S; Sato, Y; Yamagata, Y; Yasui, H; Yoshimura, A; Ashikari, M; Bessho-Uehara, K

BREEDING SCIENCE Vol. 74 ( 3 ) page： 247 - 258 2024

Development of genomic and genetic resources facilitating molecular genetic studies on untapped Myanmar rice germplasms

Furuta, T; Saw, OM; Moe, S; Win, KT; Hlaing, MM; Hlaing, ALL; Thein, MS; Yasui, H; Ashikari, M; Yoshimura, A; Yamagata, Y

BREEDING SCIENCE Vol. 74 ( 2 ) page： 124 - 137 2024

Detection of QTLs regulating the second internode length in rice dwarf mutant d1

Ha, QT; Moe, S; Reyes, VP; Doi, K; Miura, K; Mizushima, M; Maeno, A; Tsuda, K; Nagai, K; Ashikari, M

BREEDING SCIENCE Vol. 74 ( 5 ) page： 443 - 453 2024

Can the Wild Perennial, Rhizomatous Rice Species Oryza longistaminata be a Candidate for De Novo Domestication? Open Access

Tong Shuai, Ashikari Motoyuki, Nagai Keisuke, Pedersen Ole

RICE Vol. 16 ( 1 ) 2023.12

Contribution of genes related to grain number (Gn1a and WFP) introgressed into NERICA 1 to grain yield under tropical highland conditions in central Kenya Open Access

Kikuta, M; Menge, DM; Gichuhi, EW; Samejima, H; Tomita, R; Kimani, JM; Musila, RN; Doi, K; Ashikari, M; Angeles-Shim, R; Jena, KK; Makihara, D

PLANT PRODUCTION SCIENCE Vol. 26 ( 3 ) page： 309 - 319 2023.7

GBScleanR: robust genotyping error correction using a hidden Markov model with error pattern recognition Open Access

Furuta, T; Yamamoto, T; Ashikari, M

GENETICS Vol. 224 ( 2 ) 2023.6

Molecular mechanism of internode elongation in rice Open Access

Nagai Keisuke, Ashikari Motoyuki

BREEDING SCIENCE 2023.4

Regulator of Awn Elongation 3, an E3 ubiquitin ligase, is responsible for loss of awns during African rice domestication Open Access

Bessho-Uehara, K; Masuda, K; Wang, DR; Angeles-Shim, RB; Obara, K; Nagai, K; Murase, R; Aoki, S; Furuta, T; Miura, K; Wu, JZ; Yamagata, Y; Yasui, H; Kantar, MB; Yoshimura, A; Kamura, T; McCouch, SR; Ashikari, M

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Vol. 120 ( 4 ) 2023.1

REGULATOR OF AWN ELONGATION 3 is responsible for loss of awns during African rice domestication. Reviewed International coauthorship Open Access

Kanako Bessho-Uehara, Kengo Masuda, Diane R. Wang, Rosalyn B. Angeles-Shim, Keisuke Obara, Keisuke Nagai, Riri Murase, Shin-ichiro Aoki, Tomoyuki Furuta, Kotaro Miura, Jianzhong Wu, Yoshiyuki Yamagata, Hideshi Yasui, Michael Kantar, Atsushi Yoshimura, Takumi Kamura, Susan R. McCouch, Motoyuki Ashikari.

PNAS Vol. 120 ( 4 ) page： e2207105120 2023.1

Designing rice panicle architecture via developmental regulatory genes Open Access

Agata Ayumi, Ashikari Motoyuki, Sato Yutaka, Kitano Hidemi, Hobo Tokunori

BREEDING SCIENCE Vol. 73 ( 1 ) page： 86 - 94 2023

Deep Fluorescence Observation in Rice Shoots via Clearing Technology. Reviewed Open Access

Yoko Niimi, Keisuke Nagai, Motoyuki Ashikari, Yoko Mizuta

Journal of Visualized Experiments 2022.6

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Papers - ASHIKARI, Motoyuki