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Morishita T.,National Institute Agr Science | Morishita T.,National Agr Res Center For Hokkaido Reg | Shimizu A.,National Institute Agr Science
Japanese Journal of Crop Science | Year: 2011

The effect of chronic gamma ray irradiation on the growth and grain filling of soybean cultivar 'Enrei' was investigated. In the Gamma Field (Hitachiomiya, Japan) soybean plants were irradiated with gamma rays at a dose rate about 2.4 Gy/day for 1-4, 8 or 12 weeks from the seedling stage, 1-4 or 8 weeks from the flowering stage and 1-4 weeks from the middle of the maturing stage. Irradiation from the maturing stage did not decrease the number of seeds. However, irradiation from the seedling or flowering stage decreased the number of seeds with increasing irradiation period and 4-week irradiation slightly less than 50 Gy in total, reduced the seed number to one-third of the control. The reduction of seeds number by irradiation from the seedling stage was caused by the inhibition of growth at the early growth stage, but that from the flowering stage resulted from the increase in the number of unfilled pods. Irradiation for all growing periods increased the number of unfilled pods and reduced the number of seeds extremely when the dose exceeded 1.1 Gy/day (120 Gy in total).


Morishita T.,National Institute Agr Science | Morishita T.,Hokkaido Agr Res Center | Yamaguchi H.,National Institute Agr Science | Yamaguchi H.,National Institute Flo Science | And 4 more authors.
Japanese Journal of Crop Science | Year: 2013

Curcumin contents (curcumin, monodemethoxycurcumin, and bis-demethoxycurcumin) and antioxidative activities of 11 strains of Curcuma longa, 6 strains of Curcuma aromatica, and 3 strains of Curcuma zedoaria were evaluated in Ibaraki Prefecture in 2004 and 2005. C. longa was classified into two groups, according to total curcumin contents, 8 strains mainly from Japan and Taiwan (C. longa I) that contained 200-700 mg/100g dry weight (DW), and 3 strains from Southeast Asia (C. longa II) that contained more than 1800 mg/100 gDW. C. aromatica had a total curcumin content of 50-100 mg/100 gDW. Two of the 3 strains of C. zedoaria, did not contain curcumins, but 1 strain contained about 1500 mg/100 gDW. There were difference in the ratios of curcumins among C. longa I, II, C. aromatica, and C. zedoaria. Although the curcumin contents and antioxidative activities of most strains were higher in 2005 than in 2004, the year-to-year correlation was significant. Consequently, despite the large yearto- year variation in curcumin contents, the order of groups was stable. Although it is impossible to estimate the curcumin contents of each strain, it is possible to classify the strains into groups.

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