To examine the chilling resistance of a newly developed super hybrid rice （Oryza sativa） Liangyou 122 at the different temperatures, an experiment was conducted to investigate the photosynthetic pigments contents, c...To examine the chilling resistance of a newly developed super hybrid rice （Oryza sativa） Liangyou 122 at the different temperatures, an experiment was conducted to investigate the photosynthetic pigments contents, changes in fatty acids content of thylakoid membrane and the activities of several anti-oxidative enzymes at milky stage with traditional hybrid rice Shanyou 63 as control, by growing rice under the 25/15℃ and 25/20℃ day/night temperature. The results showed that the malondialdehyde（MDA） content and superoxide anion（O2^-·） were increased remarkably, while the activities of superoxide dismutase（SOD） and catalase（CAT） were obviously decreased with the duration of low temperature treatment. Moreover, the change enhanced with the increased difference between day and night temperatures. Meanwhile, the index of unsaturated fatty acid （IUFA） of both varieties also increased. As a result, the photosynthetic rate and the chlorophyll content were decreased considerably, while at beginning the carotenoids content increased and then decreased. Of all the parameters investigated, the variation range In Llangyou 122 was less than that in Shanyou 63, but the values of the former were more than the latter, which means that Llangyou 122 may be more resistant to chilling temperature at the milky stage.展开更多
Pr-CeO2 Nano-crystalline red pigments were prepared by low-temperature combustion with a later hydrothermal treatment using Ce（NO3）3·6H2O and Pr6O11 as raw materials. The phase composition, coloring mechanism a...Pr-CeO2 Nano-crystalline red pigments were prepared by low-temperature combustion with a later hydrothermal treatment using Ce（NO3）3·6H2O and Pr6O11 as raw materials. The phase composition, coloring mechanism and morphology of pigments were analyzed by XRD, SEM, EDS and XPS. Results showed that Pr-CeO2 solid solution with a fluorite structure was obtained by the diffusion of Pr^＋3 into CeO2 crystal lattice during the synthesis process. XPS analysis indicated that Pr^＋3 substitutes Ce^＋4 in CeO2 and is compensated by oxygen vacancies. Compared with low-temperature combustion synthesis, the Pr-CeO2 pigments prepared with a subsequent hydrothermal treatment have an average grain size of about 16.70 nm, and the crystallinity and red tonality are improved.展开更多
基金National Natural Science Foundation of China （No. 30270792） Natural Science Foundation of Jiangsu Province, China （No. BK2004143） the Key Project of Ministry of Education, China （No. 204049）.
文摘To examine the chilling resistance of a newly developed super hybrid rice （Oryza sativa） Liangyou 122 at the different temperatures, an experiment was conducted to investigate the photosynthetic pigments contents, changes in fatty acids content of thylakoid membrane and the activities of several anti-oxidative enzymes at milky stage with traditional hybrid rice Shanyou 63 as control, by growing rice under the 25/15℃ and 25/20℃ day/night temperature. The results showed that the malondialdehyde（MDA） content and superoxide anion（O2^-·） were increased remarkably, while the activities of superoxide dismutase（SOD） and catalase（CAT） were obviously decreased with the duration of low temperature treatment. Moreover, the change enhanced with the increased difference between day and night temperatures. Meanwhile, the index of unsaturated fatty acid （IUFA） of both varieties also increased. As a result, the photosynthetic rate and the chlorophyll content were decreased considerably, while at beginning the carotenoids content increased and then decreased. Of all the parameters investigated, the variation range In Llangyou 122 was less than that in Shanyou 63, but the values of the former were more than the latter, which means that Llangyou 122 may be more resistant to chilling temperature at the milky stage.
基金This work was supported by the Scientific Research Foundation of Shaanxi University of Science and Technology (No. SUST-B06)
文摘Pr-CeO2 Nano-crystalline red pigments were prepared by low-temperature combustion with a later hydrothermal treatment using Ce（NO3）3·6H2O and Pr6O11 as raw materials. The phase composition, coloring mechanism and morphology of pigments were analyzed by XRD, SEM, EDS and XPS. Results showed that Pr-CeO2 solid solution with a fluorite structure was obtained by the diffusion of Pr^＋3 into CeO2 crystal lattice during the synthesis process. XPS analysis indicated that Pr^＋3 substitutes Ce^＋4 in CeO2 and is compensated by oxygen vacancies. Compared with low-temperature combustion synthesis, the Pr-CeO2 pigments prepared with a subsequent hydrothermal treatment have an average grain size of about 16.70 nm, and the crystallinity and red tonality are improved.
