Hydroponic cultures were conducted to compare the aluminum（Al） tolerance among different rice（Oryza sativa L.） varieties, including indica, japonica and their hybrids. The results showed that the root growth of ri...Hydroponic cultures were conducted to compare the aluminum（Al） tolerance among different rice（Oryza sativa L.） varieties, including indica, japonica and their hybrids. The results showed that the root growth of rice plant was inhibited in different degrees among Al treated varieties. The Al tolerance observed through relative root elongation indicated that five japonica varieties including Longjing 9, Dharial, LGC 1, Ribenyou and Koshihikari were relatively more tolerant than indica varieties. Most indica varieties in this study, such as Aus 373 and 9311（awnless）, were sensitive to Al toxicity. The Al tolerance of most progenies from japonica × indica or indica × japonica crosses was constantly consistent with indica parents. The differences of Al tolerance among Longjing 9（japonica）, Yangdao 6（indica） and Wuyunjing 7（japonica） were studied. Biomass and the malondial-dehyde content of Yangdao 6 under Al exposure decreased and increased, respectively, while there was no significant effect on those of Longjing 9 and Wuyunjing 7. Remarkable reduction of root activities was observed in all these three rice varieties. Significantly higher Al content in roots was found in Yangdao 6 compared to Longjing 9 or Wuyunjing 7.展开更多
Hot vulcanized silicone rubber based ablative composite is a type of good internal insulating material to meet the crucial requirement for high-speed aircraft structures and as structural components of space vehicles ...Hot vulcanized silicone rubber based ablative composite is a type of good internal insulating material to meet the crucial requirement for high-speed aircraft structures and as structural components of space vehicles in thermal protection system.Materials were milled on a two-roll mill.50 phr vinylmethylsiloxane homopolymer and polymethylphenylvi-nylsiloxane were encapsulated onto rollers.20 phr of fumed silica and 1 phr of hydroxy silicone oil were incorporated into the rubber matrix step by step.Three different boron phenolic resin(BF)concentrations(30,40,50 phr)were discretely in the silicon rubber matrix,respectively.展开更多
基金financially supported by the National Transformation Science and Technology Program, China (Grant No. 2009ZX08001-024B)
文摘Hydroponic cultures were conducted to compare the aluminum（Al） tolerance among different rice（Oryza sativa L.） varieties, including indica, japonica and their hybrids. The results showed that the root growth of rice plant was inhibited in different degrees among Al treated varieties. The Al tolerance observed through relative root elongation indicated that five japonica varieties including Longjing 9, Dharial, LGC 1, Ribenyou and Koshihikari were relatively more tolerant than indica varieties. Most indica varieties in this study, such as Aus 373 and 9311（awnless）, were sensitive to Al toxicity. The Al tolerance of most progenies from japonica × indica or indica × japonica crosses was constantly consistent with indica parents. The differences of Al tolerance among Longjing 9（japonica）, Yangdao 6（indica） and Wuyunjing 7（japonica） were studied. Biomass and the malondial-dehyde content of Yangdao 6 under Al exposure decreased and increased, respectively, while there was no significant effect on those of Longjing 9 and Wuyunjing 7. Remarkable reduction of root activities was observed in all these three rice varieties. Significantly higher Al content in roots was found in Yangdao 6 compared to Longjing 9 or Wuyunjing 7.
基金Innovation and Entrepreneurship Training Program for University Students of Shenyang Ligong University(S 202110144004).
文摘Hot vulcanized silicone rubber based ablative composite is a type of good internal insulating material to meet the crucial requirement for high-speed aircraft structures and as structural components of space vehicles in thermal protection system.Materials were milled on a two-roll mill.50 phr vinylmethylsiloxane homopolymer and polymethylphenylvi-nylsiloxane were encapsulated onto rollers.20 phr of fumed silica and 1 phr of hydroxy silicone oil were incorporated into the rubber matrix step by step.Three different boron phenolic resin(BF)concentrations(30,40,50 phr)were discretely in the silicon rubber matrix,respectively.
