Tohoku Agricultural Research Center

Morioka-shi, Japan

Tohoku Agricultural Research Center

Morioka-shi, Japan
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Oikawa S.,Ibaraki University | Ehara H.,Tokyo University of Agriculture | Koyama M.,Tokyo University of Agriculture | Hirose T.,Tokyo University of Agriculture | And 10 more authors.
Plant and Soil | Year: 2017

Aims: Nitrogen (N) resorption from senescing leaves is essential to meet N demand for grain development in rice (Oryza sativa L.). We asked whether rice is capable of reducing N in their senesced leaf blade to lower concentration at elevated [CO2] more in low than in high N fertilization. Methods: The effects of elevated [CO2] and N fertilization on senesced leaf N concentration were examined for 3 years with the free-air CO2 enrichment (FACE) technology. Results: Elevated [CO2] decreased the senesced leaf N concentration but the change was generally small and did not hold over the growing seasons. Additionally, there was no evidence that the change was greater at low than at high N fertilization levels. Conclusions: The 3-year field measurements showed that elevated [CO2] did not change the senesced leaf N concentration consistently. The occasional decrease in senesced leaf N concentration was associated with a decrease in green leaf N concentration at elevated [CO2] but not with the proportion of leaf N resorbed during leaf senescence. © 2017 Springer International Publishing Switzerland


Ogino M.,Kitasato University | Matsuura A.,Kitasato University | Yamazaki A.,Kitasato University | Irimajiri M.,Kitasato University | And 7 more authors.
Animal Science Journal | Year: 2013

Plasma insulin (INS), thyroxin (T4), glucose (GLU), non-esterified fatty acid (NEFA), blood urea nitrogen (BUN), rectal temperature (RT) and eating behavior were evaluated in Japanese Shorthorn cattle under varying external environments and management techniques. Serial blood collection and assessments of RT and eating behavior were performed over 48h in the spring, summer, autumn and winter in four female cattle reared under either free-stall and ad libitum feeding (FA) conditions or tie-stall and restricted feeding (TR) conditions. Cycle patterns for each parameter were examined using spectral analysis, and correlations between parameters were investigated using cross-spectral analysis. Rhythms for all parameters, except eating behavior and T4, did not differ significantly among the varied external environments and between management techniques, although seasonal differences in the concentration or value of parameters were observed. An approximate 3- or 4-h rhythm cycle detected in T4, GLU, NEFA, BUN, and RT might be the common metabolic rhythm. Under both conditions, the metabolite levels showed strong correlations with eating behavior. Moreover, GLU positively correlated with INS at lag time of 0h, as did eating behavior and RT. © 2013 Japanese Society of Animal Science.

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