タイトル(別表記) Genetic mechanism for soil-surface roots originating from a New Plant Type rice (Oryza sativa L.)
フルテキストURL srfa_109_041_047.pdf
著者 冨田 朝美|
抄録 A new method of using seedling trays to evaluate root angle distribution in rice (Oryza sativa. L) was developed. By using this method, the root angle distributions of 97 accessions were characterized into two cluster groups ; A and B. The numbers of accessions in group A were limited, and these were categorized as shallow rooting types including soil-surface root. Group B included from shallow to deep rooting types, including both Indica and Japonica Group cultivars, lowland and upland cultivars, and landraces and improved types. An introgression line YTH16 harboring chromosome segments from a New Plant Type cultivar IR65600-87-2-2-3 with genetic background of an Indica Group rice IR 64, was included in Group A. To clarify the genetic mechanism for soil-surface rooting, quantitative trait loci (QTL) analysis was performed using hybrid populations derived from a cross between IR 64 and YTH16. A total of 8 QTLs were detected in the 3 introgressed segments on chromosomes (chr.) 2, 5 and 7. Seven chromosome segment lines (CSLs) combining these 3 QTL regions were selected from the progenies. The 2 CSLs harboring a single region (excluding the CSL with a region on chr. 5) showed high soil-surface root scores and low root vertical angles (RVA) in comparison with IR 64. Four CSLs harboring 2 or 3 regions showed high scores and low RVAs in comparison with YTH16 and the CSLs harboring a single QTL region. These results indicated that the soil-surface and shallow rooting of YTH16 was controlled by the 2 major QTLs’ regions on chrs. 2 and 7, and that chr. 5 particularly played a role for supporting the effect with them.
キーワード root angle distribution soil-surface root New Plant Type QTL rice (Oryza sativa L.)
出版物タイトル 岡山大学農学部学術報告
発行日 2020-02-01
109巻
開始ページ 41
終了ページ 47
ISSN 2186-7755
言語 Japanese
論文のバージョン publisher
タイトル(別表記) Sexuality in plants, unveiled from genome evolution
フルテキストURL srfa_109_037_040.pdf
著者 赤木 剛士|
抄録 Sexual polymorphism, a main strategy to maintain genetic diversity within a species, has long been a major focus in biology. Notwithstanding, in plants, evolution of sexual systems and mechanisms underlying these transitions have been little unveiled. We have elucidated the molecular mechanism of sex determination in persimmons (Diospyros spp.), where the Y-encoded smRNA gene OGI can repress the female-determining gene MeGI, and also in kiwifruits (Actinidia spp.), where the Y-encoded two sex determinants, Shy Girl and Friendly Boy, control gynoecium and androecium development, respectively. Although the molecular functions of these determinants are distinct, they have common evolutionary scenarios involving transitions of sexual systems. In persimmon, a recent genome triplication (hexaploidization) in cultivated persimmon (D. kaki) derived “flexible” sexuality via establishing epigenetic layers on the two sex determinants. On the other hand, an ancient Diospyros-specific paleo-genome duplication (paleo-tetraploidization) enabled neofunctionalization in the proto-MeGI, via positive selection, to establish a new function as a sex determinant. In kiwifruit, one of the two sex determinants, Shy Girl, was derived from neofunctionalization via Actinidia-specific duplication event. These findings exemplify how plant-specific numerous duplication events can drive flexible genetic material whose variation can be selected for development of new sexual systems.
キーワード Sex determination Sex chromosome Polyploidization Genome evolution Tree crops
出版物タイトル 岡山大学農学部学術報告
発行日 2020-02-01
109巻
開始ページ 37
終了ページ 40
ISSN 2186-7755
言語 Japanese
論文のバージョン publisher
タイトル(別表記) Development of Effective Biological Treatment Process for Acid Mine Drainage
フルテキストURL srfa_109_029_036.pdf
著者 上村 一雄| 金尾 忠芳|
抄録 Acid mine drainage (AMD) is acidic and generally enriched with iron, aluminum, sulfate and heavy metals, such as lead and cadmium. AMD is a growing problem of emerging concern that cause detrimental effects to the environment and living organisms. Yanahara mine in Misaki Town, Okayama, Japan, had mainly produced pyrite for sulfuric acid manufacture. Although it was closed in 1991, AMD is being generated from the mine now. A passive treatment based on the biological oxidation of ferrous iron is a promising strategy for AMD remediation. AMD from Yanahara mine is treated in a plant using iron-oxidizing bacteria, Acidithiobacillus ferrooxidans and Ferrovum spp. The AMD generation continues for several centuries with dramatic consequences on the receiving environments. Therefore, the development of sustainable and cost effective treatment process is required. A development of the effective biological treatment process with an iron oxidation reactor operated at pH 3.5 is described in this report. Economic aspects are also discussed.
キーワード acid mine drainage bioremediation iron-oxidizing bacteria microbial community Acidithiobacillus ferrooxidans
出版物タイトル 岡山大学農学部学術報告
発行日 2020-02-01
109巻
開始ページ 29
終了ページ 36
ISSN 2186-7755
言語 Japanese
論文のバージョン publisher
フルテキストURL srfa_109_021_027.pdf
著者 Annah Khatenje Indeche| Yoshida, Yuichi| Miyaji, Daisuke| Goto, Tanjuro| Yasuba, Ken-ichiro| Tanaka, Yoshiyuki|
抄録 The objectives of this study were to (i) determine the optimum number of whole leaves to retain on a tomato plant for effective blossom-end rot (BER) management and (ii) explore the relationship between shoot calcium (Ca) and fruit Ca in non-defoliated plants in two different sized fruit cultivars, a large-fruited cultivar ‘Momotaro fight’ and a medium-fruited cultivar ‘Cindy sweet’. Treatments involved maintaining 18, 15 and 12 leaves on a plant. All lateral shoots were removed regularly throughout the growing period except the shoot closest to the flowering truss in the 18-leaf treatment. At the length of 10cm, these shoots were sampled for real time Ca determination using a hand held Ca2+ meter. In the plants defoliated to 18 leaves, BER was higher in ‘Momotaro fight’ at 10% compared to 2% in ‘Cindy sweet’. Fruit growth rate was significantly increased by defoliation in ‘Momotaro fight’, however no significant difference was observed among treatments in ‘Cindy sweet’. Defoliating to 12 leaves increased daily Ca transport rate by 59% and 37% in ‘Momotaro fight’ and ‘Cindy sweet’, respectively. Defoliating to 12 leaves increased the water-soluble Ca concentration in the distal part of fruit by 34% and 14% in ‘Momotaro fight’ and ‘Cindy sweet’, respectively. In the plants defoliated to 18 leaves where only old yellowish leaves were removed, a significant steady decrease was observed in the concentration of water soluble Ca in the distal part of fruit with increase in truss order. There was a significant linear relationship between water-soluble Ca concentration in the distal part of the fruit and Ca concentration in the lateral shoot of plants defoliated to 18 leaves. We conclude that under moderate water stress by root zone restriction and also certain other BER inductive conditions, defoliation to 12–15 leaves on a tomato plant should be a promising approach for decreasing BER incidence in susceptible large fruit cultivars.
キーワード BER management defoliation water-soluble Ca lateral shoot Ca root zone restriction
出版物タイトル 岡山大学農学部学術報告
発行日 2020-02-01
109巻
開始ページ 21
終了ページ 27
ISSN 2186-7755
言語 English
論文のバージョン publisher
フルテキストURL srfa_109_013_020.pdf
著者 Nguyen Quang Co| Nguyen Thi Thanh Hien| Saitoh, Kuniyuki|
抄録 The field study was conducted in Nam Dong district, Thua Thien Hue province, Vietnam during May 2019 to observe the effects of SRI method on the rice yield and eradicate the factor affecting the yield. The study was carried out to evaluate the agronomic characteristics of rice, fresh and dry matter production, soil characteristics with a focus group discussion regarding cultivation by SRI and non-SRI methods. The soil analyses using standard measurements showed quite similar soil fertility in both SRI and non-SRI methods, while rice plants showed good agronomic performances and fresh and dry matter production in SRI method. At harvesting time, the yield and yield potentials of rice were greater in SRI than that in non-SRI methods. Focus group discussion found some factors that limited SRI development in Nam Dong district.
キーワード Actual yield Focus group discussion Filled spikelets SRI Weeding
出版物タイトル 岡山大学農学部学術報告
発行日 2020-02-01
109巻
開始ページ 13
終了ページ 20
ISSN 2186-7755
言語 English
論文のバージョン publisher
タイトル(別表記) Mathematical analysis of copy number variation of 2 μ-based plasmids in yeast cells
フルテキストURL srfa_109_007_011.pdf
著者 佐伯 望| 守屋 央朗|
抄録  Plasmids with the 2 μ plasmid origin are commonly-used in the genetic engineering of the budding yeast Saccharomyces cerevisiae. Intracellular copy numbers of 2 μ plasmids are different depending on the genes inserted into the plasmids. This difference is thought to occur from the difference in the growth efficiency (fitness) produced by the positive- and negative-selection biases of genes inserted in the plasmid. In this study, we made a mathematical model based on this assumption. Computational simulations of the model validated that copy numbers of the plasmids are rapidly settled depending on the fitness created by the gene on the plasmid. The copy number of a plasmid only contains a bias to keep the plasmid in a single copy became average 20copies per cell when the plasmid is randomly distributed, suggesting that no positive distribution mechanism is required for a plasmid to become multicopy.
キーワード yeast 2 μ plasmid mathematical model
出版物タイトル 岡山大学農学部学術報告
発行日 2020-02-01
109巻
開始ページ 7
終了ページ 11
ISSN 2186-7755
言語 Japanese
論文のバージョン publisher
タイトル(別表記) Recombinant expression and characterization of quinone-containing novel glycine oxidase from Marinomonas mediterranea
フルテキストURL srfa_109_001_006.pdf
著者 梶山 雄輝| 溝端 佐津紀| 赤地 周作| 根本 理子| 田村 隆| 稲垣 賢二|
抄録  Novel glycine oxidase (GlyOX) from Marinomonas mediterranea depends on cysteine tryptophilquinone (CTQ) and catalyzes the oxidative deamination of glycine to produce a glyoxylate, ammonia, and hydrogen peroxide. M. mediterranea GlyOX genes (goxA and goxB) were cloned and recombinant GlyOX was heterologously expressed by E. coli. The purification of recombinant GlyOX was carried out by metal affinity and DEAE-Toyopearl 650M column chromatographies. M. mediterranea GlyOX was homotetramic with a molecular mass of 76kDa and showed optimum activity around 30°C and at pH 5.0, and stability below 50°C and between pH 5.0 to 9.0. M. mediterranea GlyOX shows a strict substrate specificity toward glycine, and the Michaelis constant for glycine was 0.5mM. M. mediterranea GlyOX could determine the quantity of glycine in human serum and human blood plasma with high sensitivity. This study revealed the catalytic and structural properties of M. mediterranea GlyOX with high substrate specificity.
抄録(別表記) , , ,
キーワード glycine oxidase Marinomonas mediterranea cysteine tryptophilquinone recombinant expression enzymatic glycine assay
出版物タイトル 岡山大学農学部学術報告
発行日 2020-02-01
109巻
開始ページ 1
終了ページ 6
ISSN 2186-7755
言語 Japanese
論文のバージョン publisher
JaLCDOI 10.18926/57775
タイトル(別表記) Reassessment of Josetsu's “Catching a Catfish with a Gourd” :Focusing on the Interpretation of the Word “Sinyou” in the Inscription
フルテキストURL hss_48_(019).pdf
著者 孫 文祺|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ (19)
終了ページ (40)
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57774
タイトル(別表記) Japanese translation of “Lunyu Jizhu”(3)(The first part) : Xi ZHU’s Interpretation of “Confucian Analects”
フルテキストURL hss_48_(001).pdf
著者 孫 路易|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ (1)
終了ページ (17)
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57771
タイトル(別表記) On the Word Formation of Japanese Loanword Abbreviations in the Meiji and Taisho Periods : Focusing on the Simple Word Type
フルテキストURL hss_48_215.pdf
著者 佘 澤涛|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 215
終了ページ 233
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57770
タイトル(別表記) On the worth of “A tocanando” and “A toka B( nado)tokoso” sentences in the formation of “...toka...toka” sentences
フルテキストURL hss_48_205.pdf
著者 姫 宇恒|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 205
終了ページ 213
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57769
タイトル(別表記) Tan-min from a View of Yong-zheng Emperor’s Policy to Emancipate Low Class People
フルテキストURL hss_48_191.pdf
著者 王 歓歓|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 191
終了ページ 204
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57768
フルテキストURL hss_48_171.pdf
著者 エイ タンダー アウン|
抄録 In this paper, I focus on the characteristics of Japan and the Japanese people as portrayed in his writings by U Hla, a trader from Myanmar who studied the Japanese economy and industry, and the behaviour of the Japanese people during his visit to Japan in 1936. The aim of this paper is to know why U Hla wanted to visit Japan, what he learnt during his business trip to Japan, what kind of knowledge he acquired from Japan, why he was interested in the banking system, and how he applied the knowledge he gained in Japan after he returned to Myanmar. The primary and secondary sources for this study came from the National Library of Myanmar, Universities’Central Library, University of Yangon Library, University of Maubin Library, and Internet archives.
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 171
終了ページ 189
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57767
タイトル(別表記) The Value-added Structure of Gross Exports in China-Japan Trade
フルテキストURL hss_48_153.pdf
著者 馮 君実|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 153
終了ページ 170
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57766
タイトル(別表記) Educational Effect on Karen People during the Colonial Period
フルテキストURL hss_48_143.pdf
著者 ノー セー セー プエー|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 143
終了ページ 152
ISSN 1881-1671
言語 English
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57765
タイトル(別表記) Perception of China in the Japanese Magazine Kaizo: From the Perspective of Publications by Bertrand Russell
フルテキストURL hss_48_131.pdf
著者 許 丹青|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 131
終了ページ 142
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57764
タイトル(別表記) SATO Haruo's Translation Method on LU Xun's 'The Native Country'
フルテキストURL hss_48_109.pdf
著者 曲 嵐|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 109
終了ページ 129
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57763
タイトル(別表記) Grammaticalization of the Noun ‘Akatsuki’ in Modern Japanese: An Investigation of “The Corpus of Historical Japanese: Meiji / Taishō Era Series I Magazines”
フルテキストURL hss_48_087.pdf
著者 劉 小妹|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 87
終了ページ 107
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57761
タイトル(別表記) A Study on the Distribution and Variety of Otaue( 2): Descriptions of Otaue Contained within Books, Papers and Magazine Articles
フルテキストURL hss_48_065.pdf
著者 髙野 宏|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 65
終了ページ 85
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher
JaLCDOI 10.18926/57760
タイトル(別表記) Can Group-Level Group Identity be a Basis for Group Norms? : An Exploratory Study Using Multilevel Modeling -
フルテキストURL hss_48_051.pdf
著者 尾関 美喜|
出版物タイトル 岡山大学大学院社会文化科学研究科紀要
発行日 2019-12-20
48巻
開始ページ 51
終了ページ 64
ISSN 1881-1671
言語 Japanese
著作権者 Copyright (c) 2019 岡山大学大学院社会文化科学研究科
論文のバージョン publisher