|
Affiliation |
Faculty of Agriculture Field Science Center |
|
Title |
Associate Professor |
|
External Link |
|
ISHIGAKI Genki
|
|
|
Research Areas 【 display / non-display 】
-
Environmental Science/Agriculture Science / Science in plant genetics and breeding
Papers 【 display / non-display 】
-
Tiller Number and Flowering Ability on BC1F1 Progeny of Interspecific Hybridization in Ruzigrass (Urochloa ruziziensis) Reviewed International coauthorship
Sidik Prasojo Y., Nitthaisong P., Muguerza M., Kamphayae S., Umami N., Ishigaki G.
BIO Web of Conferences 80 2023.12
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：BIO Web of Conferences
The objective of this study focusing on production BC1F1 progeny of interspecific hybridization in ruzigrass (Urochloa ruziziensis) were to evaluate potential of pentaploid BC1F1 hybrid for seed propagation by associating with their tiller number, flowering, and shattering ability. In addition, we evaluate the function of various nitrogen dose on vegetative stages. Eight different genotypes were examined: B. ruziziensis 'Kennedy', B. decumbens 'Basilisk', pentaploid BC1F1 line derived from B. ruziziensis and Mulato (RM), pentaploid BC1F1 line derived from diploid B. ruziziensis and tetraploid B. ruziziensis (RR), and pentaploid BC1F1 lines derived from B. ruziziensis and B. decumbens (RD 1-4). The experimental plants treated with three level of nitrogen fertilizer (0, 4, and 8 kg/10a). Compared with parental line, RM line had high tiller number along with increasing level of nitrogen. For the flowering and shattering ability, the first lines to flowered and shattered was the pentaploid BC1F1 (RD 1-4), RR, and B. decumbens. Pentaploid BC1F1 lines derived from B. ruziziensis and B. decumbens (RD 1-4) had potential for seed propagation by associating with their flowering and shattering ability, while pentaploid BC1F1 line derived from B. ruziziensis and Mulato (RM) had the potential biomass production and yield ability by associating with its tiller number production.
-
The effects of the different sowing methods and planting density on the yield components of soybean (Glycine max) under intercropping condition with rhodes grass (Chloris gayana Kunth.) Reviewed International coauthorship
Prasojo Y.S., Niimi M., Hashiguchi M., Muguerza M., Ishigaki G.
Australian Journal of Crop Science 17 ( 10 ) 770 - 775 2023.10
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Australian Journal of Crop Science
In Japan, grass-legume intercropping systems are being developed to increase quality and yield of grain and forage. Hence, this study evaluated the effects of sowing methods and planting density on yield traits of forage soybean under intercropping condition with rhodes grass. The field experiment was laid on in a completely randomized block design with four treatments and four replications. Rhodes grass seeds were sown at 2.8 kg/10a in a field containing mono- and intercropping-plots. For soybeans, two levels of sowing densities (about 15 or 30 seeds/m2: named “L” and “H”) and two sowing methods (row or spray: named “R” and “S”) were applied for a total of four different intercropping combinations. Rhodes grass DMY obtained the highest in low level of sowing density with rowing methods (LR) (338 kg/10a) while soybean DMY obtained the highest in high level of sowing density with rowing methods (HR) (251 kg/10a) and in high level of sowing density with spray methods (HS) (177 kg/10a). Intercropping at low density increased CP (12%) and CPY (40.4 kg DM/10a) in Rhodes grass, and CP (18.9%) in soybeans, whereas high sowing density increased soybean CPY in HR (41.5 kg DM/10a) and contributed to higher soybean CPY in DM percentage at 66% (HS) and 56% (HR). Overall, high density sowing increased the 1st total DMY while row sowing increased the 1st total CPY in both crops at the first cutting, while monocropping increased Rhodes grass yield and plant length at the second-cutting. Also, sowing soybean by a broadcast spreader could obtain sufficient crude protein yield as a forage soybean in southern Kyushu, Japan. Further studies are needed for soybean overseeding method and use of early-maturity soybean lines.
-
Crude Protein Content Estimation of Rhodes Grass Using Vegetation Indices Calculated by the Spectral Reflectance Reviewed
Arai Masakazu, Nakamura Keishiro, Ishigaki Genki
Japanese Journal of Grassland Science 69 ( 1 ) 23 - 26 2023.4
Authorship：Last author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
DOI： 10.14941/grass.69.23
-
Honda N., Ishigaki G.
Australian Journal of Crop Science 17 ( 2 ) 240 - 243 2023.2
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Australian Journal of Crop Science
This study aimed to clarify the effect of water priming on the seed moisture and the rooting rate of soybean *Glycine max (L.) Merr.+ ‘Fukuyutaka’ for developing a cultivation method, where soybean seeds can directly be sown on the meadow or grassland for livestock production. The weight of each soybean seed was measured before and after they were subjected to: no treatment (control), and, two kinds of priming treatments, soaking (2 and 4 h), and moisture absorption (3, 12, and 24 h). The weight of seeds was additionally measured after keeping them at a specified temperature (28–30°C) and humidity (58–60%) for 4 h, 1, 2, and 3 days. The moisture content of soybean seeds was calculated based on their weights pre and post-treatment. The rooting rate of the seeds was investigated after each priming (control, soaking, and moisture absorption), 48 h of standing and irrigation treatment. The seed moisture content of soybean seeds increased immediately after priming (soaking or moisture absorption treatment), however, after standing, the moisture content in both treatments deceased to the same level as that of control. The rooting rate in both priming pre-treatments was similar to or lower than that in control, indicating that neither soaking nor moisture absorption of soybean seeds had a keeping moisture content of seeds for long time which promoting effect on rooting of soybean under dry condition on meadow or grassland.
-
Tissue Culture and Somatic Embryogenesis in Warm-Season Grasses—Current Status and Its Applications: A Review Reviewed International coauthorship
Muguerza M.B., Gondo T., Ishigaki G., Shimamoto Y., Umami N., Nitthaisong P., Rahman M.M., Akashi R.
Plants 11 ( 9 ) 2022.5
Language：English Publishing type：Research paper (scientific journal) Publisher：Plants
Warm-season grasses are C4 plants and have a high capacity for biomass productivity. These grasses are utilized in many agricultural production systems with their greatest value as feeds for livestock, bioethanol, and turf. However, many important warm-season perennial grasses mul-tiply either by vegetative propagation or form their seeds by an asexual mode of reproduction called apomixis. Therefore, the improvement of these grasses by conventional breeding is difficult and is dependent on the availability of natural genetic variation and its manipulation through breeding and selection. Recent studies have indicated that plant tissue culture system through somatic em-bryogenesis complements and could further develop conventional breeding programs by micro-propagation, somaclonal variation, somatic hybridization, genetic transformation, and genome ed-iting. This review summarizes the tissue culture and somatic embryogenesis in warm-season grasses and focus on current status and above applications including the author’s progress.
Books 【 display / non-display 】
-
牧草と園芸：飼料用トウモロコシに対するツマジロクサヨトウ防除の取り組みについて
石井康之、井戸田幸子、石垣元気（ Role： Joint author）
雪印種苗 2021.5
Responsible for pages：400-405 Language：Japanese
-
植調：暖地型イネ科牧草ウロクロア属草種の西南暖地への導入および栽培
石垣元気（ Role： Sole author）
日本植物調節剤研究協会 2019.11
Language：Japanese
-
平成29年度食肉に関する助成研究調査成果報告書 西南暖地におけるイネ科牧草リビングマルチ体系による飼料用ダイズ生産技術の開発（Ⅱ）
石垣元気・荒井昌和・福山喜一（ Role： Joint author）
公益財団法人伊藤記念財団 2017.11
Responsible for pages：400-405 Language：Japanese Book type：Report
-
平成29年度食肉に関する助成研究調査成果報告書 西南暖地におけるイネ科牧草リビングマルチ体系による飼料用ダイズ生産技術の開発（Ⅱ）
石垣元気, 荒井昌和, 福山喜一
公益財団法人伊藤記念財団 2017.11
Responsible for pages：400-405 Language：Japanese
-
平成28年度食肉に関する助成研究調査成果報告書 西南暖地におけるイネ科牧草リビングマルチ体系による飼料用ダイズ生産技術の開発
石垣元気・福山喜一（ Role： Joint author）
公益財団法人伊藤記念財団 2016.11
Responsible for pages：351-355 Language：Japanese Book type：Report
Presentations 【 display / non-display 】
-
黄色灯照射が飼料用トウモロコシの生育程度および収量に及ぼす影響
石垣元気・酒井貴志・安達鉄矢
日本草地学会 2022.3
Event date： 2022.3
Language：Japanese Presentation type：Oral presentation (general)
-
LEDライトトラップを用いた飼料用ダイズの主要害虫管理技術に関する基礎的研究
石垣元気・高橋京史・Yogi Sidik Prasojo・明石 良
日本草地学会 2021.3
Event date： 2021.3
Language：Japanese Presentation type：Oral presentation (general)
-
飼料用ダイズの多回刈り技術に関する基礎的研究
石垣元気・Yogi Sidik Prasojo・橋口正嗣・明石 良
日本草地学会 2020.3
Event date： 2020.3
Language：Japanese Presentation type：Oral presentation (general)
-
シリカ材添加条件下における家畜排泄物の臭気低減に関する研究
石垣元気・小林郁雄
日本草地学会 2019.3
Event date： 2019.3
Language：Japanese Presentation type：Oral presentation (general)
-
Genetic, breeding and physiology of tropical forage Invited International conference
Genki Ishigaki
2018.7
Event date： 2018.7
Language：English Presentation type：Oral presentation (general)
Awards 【 display / non-display 】
-
日本草地学会研究奨励賞
2015.3 日本草地学会
石垣元気
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
-
西南暖地における飼料用ダイズの多回刈り技術の基礎的研究ー刈り取り高さと踏圧回数ー
Grant number：19K06000 2019.04 - 2024.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
Available Technology 【 display / non-display 】
-
暖地型牧草ルジグラスにおける四倍体系統の育成とその育種的利用に関する研究
西南暖地における新規導入牧草の栽培・利用に関する研究
飼料用ダイズ生産技術の開発に関する研究Home Page： 宮崎大学農学部附属フィールド科学教育研究センター住吉フィールド（牧場）
Related fields where technical consultation is available：牧草生産，飼料生産
Message：・共同研究の希望テーマ：高タンパク質・高消化性に焦点をあてた暖地型イネ科牧草の品種改良
・飼料用ダイズ生産を家畜生産に取り入れてみたい自治体等があればご連絡ください。