Isolation and Genetic Analysis for Rice Mutants Treated with ~(60)Co γ-Ray

为了研究水稻发育的分子机制,我们利用γ射线对粳稻品种9522进行诱变,共诱变了3 000 g种子,M1代单株收种,M2代移栽5 963个株系于上海农科院.在M2代中筛选突变体,并在M3代中复选,最终得到了叶、株型育性等各类形态突变体666份.对其中162株突变体进行了遗传分析,有53.61%的突变体出现3∶1的分离,这些突变体是隐性的单位点突变.同时,这些突变体的分离也为水稻功能基因分离和功能鉴定等研究打下了良好的基础,并为水稻发育的研究提供了宝贵的材料.3,000 gram seeds of japonica cultivar 9522 background were treated with 60Co γ-Ray for the study on the molecular mechanism of rice development.Then 5 963 lines of M2 progeny were transplanted in the paddy field of Shanghai Agriculture Academy.666 mutants of the M3 progeny showed abnormal development in several organs such as flower leaf and seed,among which,162 mutants were selected randomly for further genetic analysis,53.61 percent of which showed a good fit to the expected ration of 3∶1.The result indicated that a single recessive nuclear gene might control these mutant phenotype.Isolation and genetic analysis for these mutants would pave the way for further cloning of important gene in rice and provide valuable materials for the study of rice development.国家科技部国家重点基础研究发展项目(2005CB120802)资

Surface Composition Structure and Electrochemical Performance of Aluminum Doped LiFePO4

锂离子电池正极材料掺杂LiFePO4的报道已很多，而涉及掺杂LiFePO4的表面成份及结构的研究仍很少见. 本文采用溶剂热法一步得了表面富Al的LiFePO4正极材料. TEM测试证实LiFePO4的表面形成均匀的无定型包覆层；俄歇电子能谱和软X射线吸收谱共同揭示了其表面的自包覆层为部分Al替代Fe的LiFe1-xAlxPO4. 表面富Al（x=0.02）的LiFePO4显示了较好的电化学倍率性能和低温性能，充放电-10 oC的条件下，电压范围2.2 ~ 4.2 V、0.1C倍率电极的放电比容量为98 mAh·g-1，0.5C倍率放电比容量可达70 mAh·g-1. 这归因于Al的加入改变了材料体相及表面的电子结构，增加了体相电子的传导及表面离子的传导.Despite there are many successful reports about the preparation of electrode materials with surface coating for lithium ion batteries, the study in surface self-coating of cathode materials using segregation of doping elements and their electrochemical properties is still very rare. The LiFePO4 particles with rich-Al on the surface were synthesized by one step solvothermal route. TEM results demonstrated that the surface of the obtained LiFePO4 particles was well-covered by the amorphous coating. The soft X-ray absorption spectroscopy (XAS) and Auger electron spectroscopy (AES) component analyses revealed that the amorphous coating was composed of LiFe1-xAlxPO4 by part of Al substitution to Fe. The LiFePO4 material with surface rich-Al showed good electrochemical rate capacity and low temperature performance. This could be attributed to the changes of the bulk and surface electron structures which promote the bulk electron and surface ionic conductivities.国家自然科学基金项目(No. 11179001)、北京市自然科学基金项目(No. 20110001)和国家高技术研究发展863计划项目(No. 2011AA11A254，No. 2012AA052201)资助作者联系地址：1. 北京工业大学环境与能源工程学院环境电化学实验室，北京 100717；2. 中国科技大学国家同步辐射实验室，合肥 230026；3. 北京大学工学院先进电池材料理论与技术北京市重点实验室，北京 100871Author's Address: 1. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, P. R. China; 2. NSRL, University of Science and Technology of China, Hefei 230026, P. R. China; 3. Key lab of theory and technology for advanced batteries materials, College of Engineering, Peking University, Beijing 100871, P. R. China通讯作者E-mail：[email protected]