The study was carried out to evaluate six mungbean genotypes on the basis of photosynthesis and p... more The study was carried out to evaluate six mungbean genotypes on the basis of photosynthesis and productivity under two levels of nitrogen. GK3 was found to have highest photosynthesis rate as well as the highest productivity among the six genotypes followed by VC6144A, PDM54 and IPSA25 irrespective of N levels.
In the Sahel, determining the effects of wind erosion on soil fertility and soil carbon balance i... more In the Sahel, determining the effects of wind erosion on soil fertility and soil carbon balance is crucial for achieving sustainable agriculture and for carbon sequestration, respectively. We designed the Aeolian Materials Sampler (AMS) to measure the surface flux of soil nitrogen and carbon, which limit crop production as well as water in the Sahel. The AMS should not be used alone, but with the Big Spring Number Eight (BSNE) sampler, which is a quasi-isokinetic sampler. We examined the performance of the AMS in estimating the surface flux of soil nitrogen and carbon by conducting wind-tunnel and field experiments. In the former experiment, we measured the trapping efficiency of the AMS for nitrogen and carbon content in coarse organic matter (COM) and soil particles. We observed that the AMS allows estimation of the surface flux of soil nitrogen and carbon associated with the movement of COM and soil particles; wind data and empirical equations were used for the estimation. In the field experiment, we assessed the contribution of the inherent error of the AMS to the total measurement error and found that the inherent error was negligible and did not increase the total measurement error in the estimation of the surface flux of soil nitrogen and carbon. Therefore, we concluded that the combination of the AMS and the BSNE sampler could be effectively used to evaluate the effects of wind erosion on soil fertility and soil carbon balance in the Sahel.
A wide range of wild rice species (Oryza australiensis, O. eichingeri, O. granulata, O. latifolia... more A wide range of wild rice species (Oryza australiensis, O. eichingeri, O. granulata, O. latifolia, O. officinalis and O. rufipogon) were investigated with the ultimate aim of transferring their useful traits to cultivated rice varieties. A micropropagation system has been established for a number of wild rices, adopting an appropriate combination of plant hormones and culture conditions. According to the number of in vitro-propagated shoots in the system, O. eichingeri was most responsive and O. latifolia showed the least responsiveness. Embryogenic callus was successfully induced from the basal segments of micro-propagated shoots of some wild rice species, from which green and fertile plants were regenerated.
本研究では,NaCl処理後の葉身の陽イオン音量(K^+, Ca^),及び適合溶質(プロリン,スクロース)音量を測定し,O.latifoliaの浸透圧調節能力について検討した.得られた結果は以下の... more 本研究では,NaCl処理後の葉身の陽イオン音量(K^+, Ca^),及び適合溶質(プロリン,スクロース)音量を測定し,O.latifoliaの浸透圧調節能力について検討した.得られた結果は以下の通りである.1) NaCl処理後のに音量は,O.latifoliaで最も高かったことから,O.latifokiaはK^+の関与する反応,すなわち液胞の浸透圧の維持や気孔開閉の調節能が高いことが示唆された.2)K^+/Na^+比と耐塩性の強弱との間に規則性は見出せなかった.3) Ca^/Na^+比と耐塩性の強弱との間に関連性は見出せなかった.4) NaCl存在下のプロリン音量は,耐塩性種の方で大きかった.また,耐塩性の高い種においてはプロリン音量と浸透ポテンシャルとの間に高い負の相関関係が認められ,浸透調節に対するプロリンの関与が示唆された.5)膨圧と水ポテンシャルの関係から,O.latifoliaは塩ストレス条件下で膨圧を維持することが明らかとなった.To elucidate the mechanisms of salt tolerance in wild rice Oryza latifolia Desv., we have tested the ability of osmotic adjustment by comparing its content of cation (K+ and Ca^) and compatible solute (proline and sucrose) in the leaves with those of salt-sensitive wild rice Oryza rufipogon, check varieties of cultivated rice (O. sativa L.), SR26B (salt-tolerance) and IR28 (salt-susceptible). When the plants were water-cultured with 6dSm^ (50mM) and 12dSm^ (113mM) NaCl for 30 days, the content of K^+ and Ca^ were highest in the leaves of O. latifolia among the spe...
Estimation of Nitrogen Fixation by the Natural 15~-abundance Technique and Nitrogen uptake by Pig... more Estimation of Nitrogen Fixation by the Natural 15~-abundance Technique and Nitrogen uptake by Pigeonpea Genotypes of Different Maturity Groups grown in an ~n c e~t i s o l '
This is author version post print archived in the official Institutional Repository of ICRISAT ww... more This is author version post print archived in the official Institutional Repository of ICRISAT www.icrisat.org Variation in carbon isotope discrimination and its relationship with harvest index in the reference collection of chickpea germplasm.
Zenodo (CERN European Organization for Nuclear Research), Apr 1, 1996
The variety Mot Bui is popular in deepwater areas of the Cuu Long Delta of Vietnam. It is, howeve... more The variety Mot Bui is popular in deepwater areas of the Cuu Long Delta of Vietnam. It is, however, salt-susceptible. We attempted to induce somaclonal variation for salt tolerance from this variety. The mature seeds were cultured on MS medium (supplemented with 2 mg 2,4-D L-1 , 30 g sucrose L-1 and 8 g agar L-1) for callus induction. After three subcultures, the embryoderived calli were transferred to the same medium containing 1.5% NaCl. After 1 mo, the calli that survived and grew normally under salt stress were transferred Efficiency in selection of salt-tolerant calli and parent variety Mot Bui. Another set of the its effect on plant regeneration. Description Number or conditions to obtain R 1 somaclones, and regenerated plants was grown under normal Percentage their tolerance for salt was evaluated Calli cultured in salt medium (no.) 4050 following the procedures described above. Salt-tolerant calli selected (no.) 214 (5.3%) Out of 4,050 calli subjected to in vitro Salt-tolerant calli transferred salt selection, most turned brown and died, Calli producing green shoots (no.) 48 (22.4%) but 214 showed normal growth. Of these Calli producing green shoots
The study was carried out to evaluate six mungbean genotypes on the basis of photosynthesis and p... more The study was carried out to evaluate six mungbean genotypes on the basis of photosynthesis and productivity under two levels of nitrogen. GK3 was found to have highest photosynthesis rate as well as the highest productivity among the six genotypes followed by VC6144A, PDM54 and IPSA25 irrespective of N levels.
In the Sahel, determining the effects of wind erosion on soil fertility and soil carbon balance i... more In the Sahel, determining the effects of wind erosion on soil fertility and soil carbon balance is crucial for achieving sustainable agriculture and for carbon sequestration, respectively. We designed the Aeolian Materials Sampler (AMS) to measure the surface flux of soil nitrogen and carbon, which limit crop production as well as water in the Sahel. The AMS should not be used alone, but with the Big Spring Number Eight (BSNE) sampler, which is a quasi-isokinetic sampler. We examined the performance of the AMS in estimating the surface flux of soil nitrogen and carbon by conducting wind-tunnel and field experiments. In the former experiment, we measured the trapping efficiency of the AMS for nitrogen and carbon content in coarse organic matter (COM) and soil particles. We observed that the AMS allows estimation of the surface flux of soil nitrogen and carbon associated with the movement of COM and soil particles; wind data and empirical equations were used for the estimation. In the field experiment, we assessed the contribution of the inherent error of the AMS to the total measurement error and found that the inherent error was negligible and did not increase the total measurement error in the estimation of the surface flux of soil nitrogen and carbon. Therefore, we concluded that the combination of the AMS and the BSNE sampler could be effectively used to evaluate the effects of wind erosion on soil fertility and soil carbon balance in the Sahel.
A wide range of wild rice species (Oryza australiensis, O. eichingeri, O. granulata, O. latifolia... more A wide range of wild rice species (Oryza australiensis, O. eichingeri, O. granulata, O. latifolia, O. officinalis and O. rufipogon) were investigated with the ultimate aim of transferring their useful traits to cultivated rice varieties. A micropropagation system has been established for a number of wild rices, adopting an appropriate combination of plant hormones and culture conditions. According to the number of in vitro-propagated shoots in the system, O. eichingeri was most responsive and O. latifolia showed the least responsiveness. Embryogenic callus was successfully induced from the basal segments of micro-propagated shoots of some wild rice species, from which green and fertile plants were regenerated.
本研究では,NaCl処理後の葉身の陽イオン音量(K^+, Ca^),及び適合溶質(プロリン,スクロース)音量を測定し,O.latifoliaの浸透圧調節能力について検討した.得られた結果は以下の... more 本研究では,NaCl処理後の葉身の陽イオン音量(K^+, Ca^),及び適合溶質(プロリン,スクロース)音量を測定し,O.latifoliaの浸透圧調節能力について検討した.得られた結果は以下の通りである.1) NaCl処理後のに音量は,O.latifoliaで最も高かったことから,O.latifokiaはK^+の関与する反応,すなわち液胞の浸透圧の維持や気孔開閉の調節能が高いことが示唆された.2)K^+/Na^+比と耐塩性の強弱との間に規則性は見出せなかった.3) Ca^/Na^+比と耐塩性の強弱との間に関連性は見出せなかった.4) NaCl存在下のプロリン音量は,耐塩性種の方で大きかった.また,耐塩性の高い種においてはプロリン音量と浸透ポテンシャルとの間に高い負の相関関係が認められ,浸透調節に対するプロリンの関与が示唆された.5)膨圧と水ポテンシャルの関係から,O.latifoliaは塩ストレス条件下で膨圧を維持することが明らかとなった.To elucidate the mechanisms of salt tolerance in wild rice Oryza latifolia Desv., we have tested the ability of osmotic adjustment by comparing its content of cation (K+ and Ca^) and compatible solute (proline and sucrose) in the leaves with those of salt-sensitive wild rice Oryza rufipogon, check varieties of cultivated rice (O. sativa L.), SR26B (salt-tolerance) and IR28 (salt-susceptible). When the plants were water-cultured with 6dSm^ (50mM) and 12dSm^ (113mM) NaCl for 30 days, the content of K^+ and Ca^ were highest in the leaves of O. latifolia among the spe...
Estimation of Nitrogen Fixation by the Natural 15~-abundance Technique and Nitrogen uptake by Pig... more Estimation of Nitrogen Fixation by the Natural 15~-abundance Technique and Nitrogen uptake by Pigeonpea Genotypes of Different Maturity Groups grown in an ~n c e~t i s o l '
This is author version post print archived in the official Institutional Repository of ICRISAT ww... more This is author version post print archived in the official Institutional Repository of ICRISAT www.icrisat.org Variation in carbon isotope discrimination and its relationship with harvest index in the reference collection of chickpea germplasm.
Zenodo (CERN European Organization for Nuclear Research), Apr 1, 1996
The variety Mot Bui is popular in deepwater areas of the Cuu Long Delta of Vietnam. It is, howeve... more The variety Mot Bui is popular in deepwater areas of the Cuu Long Delta of Vietnam. It is, however, salt-susceptible. We attempted to induce somaclonal variation for salt tolerance from this variety. The mature seeds were cultured on MS medium (supplemented with 2 mg 2,4-D L-1 , 30 g sucrose L-1 and 8 g agar L-1) for callus induction. After three subcultures, the embryoderived calli were transferred to the same medium containing 1.5% NaCl. After 1 mo, the calli that survived and grew normally under salt stress were transferred Efficiency in selection of salt-tolerant calli and parent variety Mot Bui. Another set of the its effect on plant regeneration. Description Number or conditions to obtain R 1 somaclones, and regenerated plants was grown under normal Percentage their tolerance for salt was evaluated Calli cultured in salt medium (no.) 4050 following the procedures described above. Salt-tolerant calli selected (no.) 214 (5.3%) Out of 4,050 calli subjected to in vitro Salt-tolerant calli transferred salt selection, most turned brown and died, Calli producing green shoots (no.) 48 (22.4%) but 214 showed normal growth. Of these Calli producing green shoots
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