Updated on 2021/12/03

写真a

 
OKADA Satoshi
 
Organization
Bioscience and Biotechnology Center Designated assistant professor
Title
Designated assistant professor

Degree 1

  1. 博士(農学) ( 2018.3   神戸大学 ) 

Research Interests 1

  1. quantitative trait locus

Research Areas 1

  1. Environmental Science/Agriculture Science / Science in plant genetics and breeding

 

Papers 3

  1. Genetic and epistatic effects for grain quality and yield of three grain-size QTLs identified in brewing rice (Oryza sativaL.). Reviewed

    Satoshi Okada, Ken Iijima, Kiyosumi Hori, Masanori Yamasaki

    MOLECULAR BREEDING   Vol. 40 ( 9 )   2020.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Rice (Oryza sativaL.) in Japan is not only a food staple but also an important material for the Japanese alcoholic beverage,sake. The grain used insakebrewing has different characters from the cooking rice grain, including a large grain size and high white-core expression rate (WCE). Because large-sized grains often have a heavy grain weight and higher yield, this trait is also important for cooking rice. Chalky grains, such as white-core or white-belly grains, are not ideal as cooking rice. Here, we report that three grain-size quantitative trait loci (QTLs;qGL4-2,qGWh5,qGWh10), derived from the brewing cultivar, Yamadanishiki, affect grain shape, chalky grain rate, and yield, using near isogenic and pyramiding lines in the genetic background of the cooking cultivar, Koshihikari. First, these QTLs influenced multiple components of grain shape, where epistatic effects were detected betweenqGL4-2andqGWh5, for grain width and thickness, and betweenqGL4-2andqGWh10, for grain length. Therefore, these QTLs may coordinate to control grain shape. Second, lines harboringqGWh5orqGWh10at the Yamadanishiki allele exhibited increased WCE, whereas lines withqGL4-2andqGWh10exhibited decreased white-belly grain rate (WBR). Thus, grain shape is associated with the occurrence of chalky grain, where the chalky type depends on the QTL. Finally, we used total panicle weight of plants as a simplified rice yield index, and a promising line pyramidingqGL4-2andqGWh5emerged. In conclusion,qGL4-2would be useful for the breeding of cooking rice, to decrease WBR, whileqGWh5andqGWh10were definitely more beneficial for that of brewing rice, to increase grain weight and WCE.

    DOI: 10.1007/s11032-020-01166-0

    Web of Science

    Scopus

  2. Life-Course Monitoring of Endogenous Phytohormone Levels under Field Conditions Reveals Diversity of Physiological States among Barley Accessions. Reviewed

    Takashi Hirayama, Daisuke Saisho, Takakazu Matsuura, Satoshi Okada, Kotaro Takahagi, Asaka Kanatani, Jun Ito, Hiroyuki Tsuji, Yoko Ikeda, Keiichi Mochida

    Plant & cell physiology   Vol. 61 ( 8 ) page: 1438 - 1448   2020.8

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

    Agronomically important traits often develop during the later stages of crop growth as consequences of various plant-environment interactions. Therefore, the temporal physiological states that change and accumulate during the crop's life course can significantly affect the eventual phenotypic differences in agronomic traits among crop varieties. Thus, to improve productivity, it is important to elucidate the associations between temporal physiological responses during the growth of different crop varieties and their agronomic traits. However, data representing the dynamics and diversity of physiological states in plants grown under field conditions are sparse. In this study, we quantified the endogenous levels of five phytohormones - auxin, cytokinins (CKs), ABA, jasmonate and salicylic acid - in the leaves of eight diverse barley (Hordeum vulgare) accessions grown under field conditions sampled weekly over their life course to assess the ongoing fluctuations in hormone levels in the different accessions under field growth conditions. Notably, we observed enormous changes over time in the development-related plant hormones, such as auxin and CKs. Using 3' RNA-seq-based transcriptome data from the same samples, we investigated the expression of barley genes orthologous to known hormone-related genes of Arabidopsis throughout the life course. These data illustrated the dynamics and diversity of the physiological states of these field-grown barley accessions. Together, our findings provide new insights into plant-environment interactions, highlighting that there is cultivar diversity in physiological responses during growth under field conditions.

    DOI: 10.1093/pcp/pcaa046

    PubMed

  3. Training instance segmentation neural network with synthetic datasets for crop seed phenotyping. Reviewed International journal

    Yosuke Toda, Fumio Okura, Jun Ito, Satoshi Okada, Toshinori Kinoshita, Hiroyuki Tsuji, Daisuke Saisho

    Communications biology   Vol. 3 ( 1 ) page: 173 - 173   2020.4

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

    In order to train the neural network for plant phenotyping, a sufficient amount of training data must be prepared, which requires time-consuming manual data annotation process that often becomes the limiting step. Here, we show that an instance segmentation neural network aimed to phenotype the barley seed morphology of various cultivars, can be sufficiently trained purely by a synthetically generated dataset. Our attempt is based on the concept of domain randomization, where a large amount of image is generated by randomly orienting the seed object to a virtual canvas. The trained model showed 96% recall and 95% average Precision against the real-world test dataset. We show that our approach is effective also for various crops including rice, lettuce, oat, and wheat. Constructing and utilizing such synthetic data can be a powerful method to alleviate human labor costs for deploying deep learning-based analysis in the agricultural domain.

    DOI: 10.1038/s42003-020-0905-5

    Web of Science

    Scopus

    PubMed

Presentations 10

  1. ‘先制育種’を指向する生活環横断的なオオムギのゲノム研究

    最相大輔, 岡田聡史, 金谷麻加, 池田陽子, 井藤純, 辻寛之, 持田恵一, 平山隆志

    日本育種学会第140講演会 

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    Event date: 2021.9

    Presentation type:Symposium, workshop panel (nominated)  

  2. シングルメリステムトランスクリプト―ムによるオオムギ茎頂部の発生トラジェクトリ解析.

    井藤純, 野村有子, 佐藤奈緒, 岡田聡史, 高萩航太郎, 杉村みどり, 関緑, 最相大輔, 持田恵一, 平山隆志, 辻寛之

    日本育種学会第140回講演会  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  3. 圃場でのオオムギ生活環の擬時間変遷

    最相大輔, 岡田聡史, 金谷麻加, 池田陽子, 井藤純, 辻寛之, 持田恵一, 平山隆志

    日本育種学会第139回講演会 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Poster presentation  

  4. 圃場トランスクリプトームデータを用いたオオムギ生活環の生長トラジェクトリ解析

    岡田聡史, 最相大輔, 金谷麻加, 池田陽子, 井藤純, 辻寛之, 井上小槙, 上原由紀子, 清水みなみ, 持田恵一, 平山隆志

    日本育種学会第139回講演会 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Poster presentation  

  5. 圃場オオムギにおけるヒストン修飾と遺伝子発現のゲノムワイド時系列解析

    池田陽子, 岡田聡史, 金谷麻加, 井上小槙, 最相大輔, 井藤純, 辻寛之, 持田恵一, 平山隆志

    第62回日本植物生理学会年会 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  6. 圃場オオムギのライフコースモニタリングによるホルモン変動と成長および環境要因との相互作用

    平山隆志, 最相大輔, 松浦恭和, 井藤純, 岡田聡史, 金谷麻加, 辻寛之, 持田恵一

    第62回日本植物生理学会年会 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Poster presentation  

  7. オオムギの圃場生長動態の種内変異

    最相大輔, 岡田聡史, 井藤純, 辻寛之, 高萩航太郎, 持田恵一, 平山隆志

    日本育種学会第137回講演会 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  8. Genetic analysis on heading time of barley (Hordeum vulgare) under multiple environments.

    Satoshi Okada, Jun Ito, Hiroyuki Tsuji, Kotaro Takahagi, Keiichi Mochida, Daisuke Saisho, Takashi Hirayama

    2020.3.29 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Poster presentation  

  9. Interspecific variation of field growth dynamics in barley.

    2020.3.29 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  10. 圃場環境におけるオオムギ系統間の生理状態の多様性

    平山隆志, 高萩航太郎, 井上小槙, 山口由紀子, 金谷麻加, 最相大輔, 松浦恭和, 岡田聡史, 井藤純, 池田陽子, 松下康弘, 辻寛之, 持田恵一

    第61回日本植物生理学会年会 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Poster presentation  

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