球孢白僵菌CDEP2基因原核表达、蛋白纯化及多克隆抗血清制备

类枯草杆菌蛋白酶是昆虫致病真菌重要的毒力因子,利用合成的特异性引物通过RT-PCR扩增了球孢白僵菌类枯草杆菌蛋白酶CDEP2基因。将其与质粒pET28a连接,构建重组原核表达载体pET28-CDEP2,转化大肠杆菌BL21(DE3),并用IPTG进行诱导表达。SDS-PAGE检测His-CDEP2融合蛋白以包涵体方式大量表达并对其进行纯化。用SDS-PAGE分离纯化的CDEP2蛋白免疫家兔,制备了多克隆抗血清。Western blotting免疫印迹检测分析表明,该抗血清对CDEP2蛋白有特异性识别能力,可用于对CDEP2蛋白功能的进一步研究。

9个杂交水稻亲本配合力的研究

利用5个不育系(隆科638S、晶4155S、C815S、Y58S、深08S)和4个恢复系(6089、6081、6439-C730、5781),通过不完全双列杂交配置20个杂交组合,同时对F1代的11个农艺性状进行配合力分析.结果表明,大多数农艺性状的一般配合力方差及特殊配合力方差都达到了显著或者极显著差异水平,且亲本的一般配合力方差明显大于特殊配合力方差,说明杂交水稻主要农艺性状的遗传以加性效应为主;一般配合力及特殊配合力效应值差异均依组合及性状的不同而变化,两者之间是相互独立的,无明显变化规律.

Analysis on Genetic Differences between Parents of Two-line Medium Indica Hybrid Rice by SSR Markers

The genetic diversity of 50 parents or improved lines of two-line medium Indica hybrid rice were analyzed based on 48 pairs of SSR markers. The results showed that the clustering results were highly accordant with the parental pedigree information of the tested materials. The male sterile lines and the restoring lines were clustered into 2 distinct groups （Ⅰ and Ⅱ）, respectively. There were no significant difference in intra-group average genetic distances （GD） between the 2 groups. Most of the male sterile lines from Hunan Longping High-tech Seed Science Research Institute Co., Ltd. were grouped into a single subgroup （Ⅰ-4） under the male sterile group with the largest average GD compared with the rest male sterile subgroups. Huazhan derived lines and Guangzhou inbred lines were founded to be independent of 9311 and its derivatives or closely-related lines. Meanwhile, they have obviously been differentiated into 2 subgroups （Ⅱ-2 and Ⅱ-3）. The lines derived from Huazhan （or genetic closely related lines） showed a genetic homogenization phenomenon. Therefore, the Huazhan-derived lines should be further improved by the utilization of germplasms with good quality, high resistance and wide adaptability from Southern China to widen the GD between Huazhan derived lines and the male sterile subgroup developed by Hunan Longping High-tech Seed Science Research Institute Co., Ltd., so as to further promote the heterosis level between the groups.

基于SSR标记的中籼型两系杂交水稻亲本遗传差异分析

利用48对SSR引物对50份中籼型两系杂交水稻骨干亲本或改良系进行了遗传多样性分析。结果表明,基于SSR分子标记的遗传聚类结果与供试材料的系谱关系高度一致,不育系和恢复系明显聚类为2个群组(Ⅰ和Ⅱ),2个群组内的平均遗传距离差异不明显。湖南隆平高科种业科学研究院有限公司选育的多数不育系材料聚合为不育系群组下的一个单独亚组(Ⅰ-4),且在4个不育系亚组中具有最大的组内平均遗传距离。华占衍生系和广东常规稻独立于9311衍生系或近缘系,且已明显分化为2个亚组(Ⅱ-2和Ⅱ-3)。华占衍生系或近缘系组存在一定程度的同质化问题,为进一步拓展此群组与湖南隆平高科种业科学研究院有限公司不育系群组之间的遗传距离,提高群组间的杂种优势水平,需继续引入华南优质、高抗、广适种质进行改良。