不同遗传背景猪PBD-110基因多态性及表达谱分析

为探究猪β-防御素110(PBD-110)基因多态性及其在猪组织中的表达情况,本试验以野杂猪、民猪和大白猪为研究对象,分别扩增PBD-110基因编码区(CDS)和内含子区,采用实时荧光定量PCR法探究3个群体猪肝脏和脾脏的组织表达差异。试验成功扩增出猪PBD-110基因CDS区和内含子区,测序证实3个群体猪PBD-110基因CDS区不存在突变位点,基因组PCR产物测序发现在内含子1存在C314T突变位点,3个群体多态性分析发现CC为优势基因型,基因型频率依次为0.750、0.781和0.516。Hardy-Weinberg平衡检验同时发现该位点在3个群体中均处于平衡状态(P>0.05),且处于中、低多态性状态(0.25<PIC<0.5;PIC<0.25)。表达谱分析结果表明,PBD-110基因在3个群体猪肝脏和脾脏中均有表达,且存在表达差异,提示PBD-110基因可能与民猪、野杂猪抗病力较强有关,在天然免疫方面发挥重要作用。

Determining Nodulation Regulatory (Rj) Genes of Myanmar Soybean Cultivars and Their Symbiotic Effectiveness with <i>Bradyrhizobium japonicum</i>USDA110

Soybean (Glycine max L.) plays an essential role in human nutrition as a protein source, and in plant nutrition as a N source. The rate of N fixation varies depending on the cultivars and compatibility between the inoculated Rhizobium strain and the host cultivar. Characterizing the nodulation regulatory (Rj) genes is necessary to determine the compatibility of cultivars and Rhizobium strains. Rj genes were previously identified based on inoculation tests and PCR analyses. The six cultivars Yezin-3, Yezin-7, Yezin-11, Shan Seine (Local), Madaya (Local), and Hinthada (Local) were identified as harboring the Rj4 gene. Two cultivars, Yezin-6 and Yezin-8, were classified as non-Rj-gene harboring. Two other cultivars, Yezin-9 and Yezin-10, were identified as Rj3- and Rj2Rj3-gene harboring, respectively. Ours is the first report on Rj3- and Rj2Rj3-gene harboring cultivars in Myanmar. We evaluated Myanmar soybean cultivars for symbiotic effectiveness, relying on the standard strain Bradyrhizobium japonicum USDA110. In our first experiment, the soybean cultivar Yezin-11 (Rj4) showed the highest N fixing potential. Based on their potential for fixing N and nodulation, the top six soybean cultivars were Yezin-11 (Rj4), Yezin-9 (Rj3), Yezin-6 (non-Rj), Yezin-8 (non-Rj), Yezin-3 (Rj4) and Yezin-10 (Rj2Rj3). These cultivars were selected for a second experiment, which revealed that the N fixation, nodulation, and plant growth of Yezin-11 (Rj4) *Corresponding author. A. Z. Htwe et al. 2800 were superior to the other cultivars. We conclude that Yezin-11 (Rj4) is the most efficient cultivar for nodulation and N fixation when inoculated with B. japonicum USDA110.

基于密度泛函理论的锂辉石晶体结构及(110)面表面化学基因特性研究

基于第一性原理,利用Material Studio软件的CASTEP模块,对锂辉石晶体的布居、能带、态密度进行了分析,结果表明,锂辉石为绝缘体,其最有可能的荷正电的活性位点为Li、Al、Si,荷负电的活性位点为O。对优化后的锂辉石(110)面的表面能、弛豫、布居、态密度和差分电荷密度进行了分析。结果表明,所构建的锂辉石表面的表面能为0.342 9 J/m2,该表面在Z轴方向的弛豫相对明显,其次是X轴方向,Y轴方向的弛豫相对较弱。锂辉石表面的布居分析表明优化后的锂辉石(110)面表层原子价电子构型、布居、键长等均发生了变化。态密度分析结果表明(110)面表层的6个O活性不同,其在费米能级附近的态密度贡献大小为:O1>O2>O3≈O6>O5>O4。因此,O1是锂辉石表面活性最高的原子,其次是O2。差分电荷密度图也表明锂辉石表面缺电子位点和多电子位点交替出现,但得失电子程度不同,因此各原子表现出不同的化学活性。根据矿物基因特性,预测锂辉石容易与含-COOH、-CONHOH、-OSO2H等易于与Al发生化学反应官能团的阴离子捕收剂作用,但捕收性能可能不佳;预测阳离子捕收剂如胺类捕收剂以及金属离子活化剂如Ca2+等,可吸附于锂辉石表面,产生较好的捕收能力和活化能力。