A5083762071- Rice Cultivation and Yield Improvement
- Plant nutrient uptake and metabolism
- Crop Yield and Soil Fertility
- GABA and Rice Research
- Potato Plant Research
- Agriculture, Soil, Plant Science
- Plant responses to water stress
- Soybean genetics and cultivation
- Wheat and Barley Genetics and Pathology
- Irrigation Practices and Water Management
- Plant Stress Responses and Tolerance
- Legume Nitrogen Fixing Symbiosis
- Growth and nutrition in plants
- Leaf Properties and Growth Measurement
- Aquaculture Nutrition and Growth
- Agronomic Practices and Intercropping Systems
- Agricultural Systems and Practices
- Plant Physiology and Cultivation Studies
- Greenhouse Technology and Climate Control
- Plant Disease Resistance and Genetics
- Plant Disease Management Techniques
- Insect and Pesticide Research
- Constructed Wetlands for Wastewater Treatment
- Postharvest Quality and Shelf Life Management
- Sunflower and Safflower Cultivation
Kagawa University
2014-2024
University of Bristol
2000
Institute of Fruit Tree and Tea Science
2000
Cairo University
2000
University of Tennessee at Knoxville
2000
Nha Trang University
1996
Takeda (Japan)
1996
Département Santé Animale
1996
Japan International Cooperation Agency
1995
A halophyte, the common ice plant (Mesembryanthemum crystallinum L.), shows maximal growth under salinity, in which almost all crops die. The NaCl-stimulated growth, is referred to as halophilism, an important trait for adaptation but mechanism still unclear. To elucidate factors contributing we tested effects of NaCl on ion accumulation, and expression homeostasis-related genes suspension-cultured cells. Among nine ions analyzed, Na+, Cl−, K+, NO3− were accumulated significantly cells...
Root hairs, projections from the epidermal cells of roots, are contributing to water and nutrient uptake anchorage soil. To better understand genetic control root hair formation in rice, we analyzed hairless 1 (rth1) mutant that was induced by NaN3 treatment. SEM observation showed rth1 plants, elongation abolished after bulge. High-resolution mapping using 2,088 segregants revealed three predicted genes a 38-kb candidate interval on chromosome 7. Sequences comparison between wild-type...
Abstract To obtain more information about the effect of salt stress on potato production, effects emergence, growth and yield, carbohydrate mineral contents, nitrate reductase (NR) activity plants (Solanum tuberosum L.) were investigated using two cultivars (May Queen Dejima). Salt was achieved by application NaCl (0, 10, 20, 30 g pot-1 corresponding ECe values 0.20, 0.77, 1.37, 1.95 dS m-1 respectively). Emergence delayed, dry matter especially in tubers, depressed with increase level. The...
Salinity adaptive responses in halophytes include energy-requiring processes, but the mechanism supplying ATP to meet increased demand remains unclear. In present study, we examined effects of NaCl on synthesis mitochondria isolated from a halophyte, common ice plant (Mesembryanthemum crystallinum L.). The rate was maintained or enhanced with increasing osmotic pressures ranged 0.2 2.0 MPa assay mixtures containing NaCl, whereas it decreased equivalent generated by sorbitol only. Also,...
Haemaphysalis longicornis ticks represent an ectoparasitic health threat to dogs. This study evaluated the immediate and persistent efficacy of orally administered fluralaner for control this tick.Twenty-four dogs were sorted into 4 groups based on their tick carrying capacity measured in a preliminary challenge. Two days before treatment, challenged with then at time treatment received oral 10, 25 or 50 mg/kg respectively 3 groups, while remaining group was sham treated. Ticks counted...
The effect of temperature (15, 25, 30°C and glasshouse as control) at different growth stages (stage-I: vegetative to tuber initiation, stage-II: initiation initial bulking stage-III: maturity) on leaf nitrate reductase (NR) activity, carbohydrate contents yield were investigated in potatoes (Solanum tuberosum L. cvs. May Queen Normn 1) pot experiment naturally lit phytotron. high treatment decreased the total dry matter production well degraded quality by reducing specific gravity. NR...
The effects of reducing plant height by the growth retardant chlormequat on radiation interception and radiation-use efficiency in field-grown wheat were studied southwest Japan. Chlormequat was applied to cultivar Sanukinoyume 2000 at beginning jointing. cumulative total solar intercepted canopy (Si) determined continuous measurements above with a dome pyranometer below tube solarimeters. Nondestructive measurement leaf area index (LAI) mean tip angle (MTA) using analyzer performed weekly....
Field experiments were carried out in 2014 and 2015 to characterize the associated attributes responsible for dry matter accumulation high-yielding soybean. We attempted create a environment by introducing narrow-row planting at two densities, using new cultivar 'Hatsusayaka' current leading 'Sachiyutaka' an upland experimental field. Dry was assessed terms of light interception radiation use efficiency (RUE). Growth analysis performed evaluate crop growth rate (CGR) contribution net...
水稲における収穫指数向上の選抜指標を検討するために, 日本品種60(日本品種群)およびアジア各国で育成された多収品種20(多収品種群)を供試し, 収穫指数(HI)と形態形質および葉色との関係を調査した.日本品種のHIは, 出穂期の葉色(葉緑素計SPAD-502型による読みとり値, SV)と正, 草丈(PL)との負の相関を示した.多収品種では, HIはSVと正の相関を示したが, HIとPLとの相関関係は有意ではなかった.HIと成熟期の稈長(CL)との間には, PLと同様の関係が認められた.日本品種のHIは穂長(EL)と負の相関を示したが, 多収品種では逆に正の相関を示した.多収品種のHIとEL/CLとの間にも正の相関関係が存在した.形態形質とHIとの関係を明らかにするために, 重回帰分析を行った.その結果, HIとSV(X1), PL(X2), EL/CL(X3)との間に有意を重相関関数が得られた.また, 標準偏回帰係数比から推定したX1, X2およびX3のHIに対する貢献割合は54:15:31であった.これらより, 出穂期の葉色, 草丈,...
The effect of high red/ far-red ratio (R/FR) on tillering in wheat and its cultivar differences were investigated with a pot experiment. Four Japanese cultivars different degree winter habit: Abukumawase, Sanukinoyume 2000, Norin 61 Iwainodaichi, grown under the tunnels R/FR conditions: one tunnel covered light control film which attenuates irradiance far red range (high R/FR) other transparent polyethylene white shading cloth (control). treatment increased by 25%, slightly decreased air...
The spike of the main culm in winter wheat was examined by scanning electron microscopy from double ridge to 6 days after terminal spikelet stage quantitatively evaluate effects s...
Field experiments were carried out for 3 years to assess the effect of using drip irrigation on growth and yield two Japanese soybean cultivars in Kagawa Prefecture, which has second-lowest rainfall Japan. The treatments (Drip) rainfed (Rainfed) from blooming stage full-seed stage. largest seed was achieved 2017, followed by 2018 2016. This order corresponded total water input (TWI, sum effective irrigation) throughout cultivation. TWI main factor affecting variation its components among...
Because an outgrowth of auxiliary bud in plant is regulated by light quality detected phytochrome, branching differences various environment or cultivars soybean would be the results responses to environment. Therefore, we analyzed number branches two determinate cultivars, 'Hatsusayaka' and 'Sachiyutaka', between low high planting densities relation within canopy. We compared changes ratio red far (R:FR) irradiance at ground level over time with canopy height those fraction intercepted...
ヨーロッパとアメリカの品種10(E群), 日本の品種20(J群)およびアジア各国で育成された多収品種16(H群)を供試し, 収量性の群間差を検討した. 総籾数(N)と籾容積(V)との積により収量キャパシティ(NV)を表し, 穂揃期までに稲体中に蓄積された炭水化物量(CW)と登熟期における乾物生産量(ΔW)との和で収量内容物(CW+ΔW)を表現した. (CW+ΔW)/NVをソース・シンク比とみなした. 平均収量(Y)はH群で最も多く, E群で最も少なかった. H群のNVとCW+ΔWはともに3群中最も大きかったが, ΔWはJ群と比べそれ程多くなかった. また, NVの増加がCW+ΔWの増加を上回っていたため, H群の(CW+ΔW)/NVはJ群に比べ低下した. しかし, H群は収量内容物の移行率[Ef:Y/(CW+ΔW)]が3群中最も高く, 籾比重(S:Y/NV)もJ群並に高かった. これらの結果は, H群の多収性が主に大きなNVとCWおよび高いEfに基づくことを示唆している. したがって, H群の収量性を一層高めるためには, ΔWの増加によるソース・シンク比の向上が必要と考えられた.
水稲における登熟性の品種間差を解析するために, 25品種の登熟歩合および精籾比重を比較した. 登熟歩合(Y)と出穂期後の積算平均気温(X)との関係は, 次の式によって表された. Y＝100－a・exp(－b・X)常数bとX切片は品種によって異なっていた. そこで, この常数b×105を登熟係数(RI), X切片を登熟開始温度(∑Ts)とし, 登熟歩合(R)および精籾比重(S)との関係を検討した. RはRIと有意な正の相関関係を示し, Sと∑Tsとの間に有意な負の相関関係が認められた. さらに, 出穂期における茎葉中の貯蔵炭水化物量(C)と出穂期後の乾物生産量(ΔW)との和を収量内容物(C＋ΔW), 総籾数(N)と精籾容積(V)との積を収量キャパシティ(NV)とし, これらとRIおよび∑Tsとの関係を検討した. (C＋ΔW)/ NVはRIと有意な正の相関を示した. ∑Tsとこれらの要因との間に直接有意な相関関係はみられなかったが, Cが多い品種は∑Tsが低くなる傾向が認められた. これらより, 収量内容物/収量キャパシティ比の高い品種は登熟係数が大きいために登熟歩合が高くなり,...
穂首節間維管束の大きさと炭水化物の転流量が水稲の登熟に及ぼす影響について, 印度型および日印交雑型の多収性品種と日本型品種を供試して比較した. 籾全体の登熟歩合(R), 1次枝梗籾の登熟歩合(R1), 2次枝梗籾の登熟歩合(R2)の平均値は, ともに多収性品種の方が日本型品種よりも低かった. そこで, 出穂期から成熟期までの籾当たり炭水化物増加量(ΔC/N)および稈＋葉鞘中の炭水化物減少量(T/N)と登熟歩合との関係を品種群別に検討したところ, 多収性品種ではT/NとR, R1およびR2との間に有意な正の相関関係が認められた. また, 多収性品種のT/Nは籾当たり大維管束面積(Vb/N)と有意な正の相関を示した. 一方, 日本型品種においては, これらの間に有意な相関関係は認められなかった. さらに枝梗別籾の登熟歩合に対する重回帰分析の結果, 多収性品種のR2にはVb/Nが強く寄与していることが判明した. これらより, 多収性品種ではVb/Nが大きい品種ほどT/Nが多くなり, とくにR2の上昇を通じて全体の登熟歩合の向上に貢献すると考えられた. しかし,...
The effects of different temperature (15, 25, 30°C and glasshouse control) moisture (75% FC, 60% FC 45% FC) treatments at three growth stages (stage-I: vegetative to beginning tuberization, stage-II: tuberization initial tuber enlargement stage-III: maturity) on net photosynthesis (PN), stomatal resistance (RS), transpiration rate (TR), dark respiration (DR) leaf chlorophyll (SPAD value) were studied in several potatoes (Solanum tuberosum L. cvs. May Queen, Dejima Normn 1) pot experiments....
従来の日本品種10(日本品種群)およびアジア各国で育成された多収品種10(多収品種群)を供試し, 出液速度の品種間差を調査するとともに, 収量関連形質との関係を検討した.出穂期における出液速度(BR1)および成熟期における出液速度(BR2)は, それぞれ2.20(g時-1株-1)～3.92, 1.50～2.62の範囲にあった.BR1およびBR2に有意な品種群間差は認められなかったが, 1-BR2/BR1によって求めた登熟期間中の出液速度減少率は, 多収品種の方が日本品種よりも有意に高かった.BR1と総ファイトマー数(TPN)との間に有意な相関関係は認められなかったが, BR1とBR1/TPNとは有意な正の相関を示した.BR1と出穂期における茎葉乾物重(SDW)/TPNとの間にも有意な正の相関関係が存在した.登熟期間中の出液速度減少率は, 葉色の低下と有意な正の相関を示した.さらに, 出液速度減少率と登熟歩合との間には有意な負の相関関係が認められた.これらより, 出穂期後の葉色の低下が大きく出液速度の減少率が高い品種は根の活力低下が激しく, 登熟性に劣ると考えられた.
水稲の日本品種60(日本品種群)とアジア各国で育成された多収品種20(多収品種群)につき, 収穫指数(HI)と収量(Y)の品種間差を調査した.HIは36.8%から53.4%に変異し, その平均値は, 日本品種では43.5%, 多収品種では48.8%であった.Yは22.6g/株から40.0g/株の範囲にあり, 日本品種における平均値は27.8g/株, 多収品種の平均値は34.1g/株であった.多収品種ではHIとYとの間に有意な相関関係が認められたが, 日本品種における相関関係は有意ではなかった.HIと成熟期における全乾物重(W2)との間には, 日本品種では有意な負の相関関係が存在したが, 多収品種に有意な相関関係は認められなかった.HIと物質生産との関係を明らかにするために, 籾数(N)と出穂期の全乾物重(W1)を基にHIを次の三つの構成要素に分割した.HI=Y/W2=[W1/W2]×[N/W1]×[Y/N] 両品種群とも, HIはW1/W2と有意な負の相関を示した.また, 日本品種ではN/W1, 多収品種ではY/Nとの間にも有意な正の相関関係が認められた.W1/W2,...