宜宾茶史初探

由于宜宾特殊的地理位置使其成为中国茶树原产地之一,进而催生了悠久的茶叶制造史和丰富多彩的宜宾茶文化,对中国茶叶传播和发展起到了重要作用。在如今的茶文化热潮下,既要继承茶文化,又要思考如何最大化弘扬地域茶文化。挖掘茶文化资源是宜宾茶文化走向未来的有利途径。     

高校如何从源头上预防和治理腐败

惩治和预防腐败教育是基础,制度是保障,监督是手段。高校反腐倡廉应从源头抓起,健全内容与形式相统一的预警机制,发挥纪检、监察、审计等职能部门的作用,建立群众监督网络,拓宽监督渠道,营造拒腐防变的氛围。     

鸡迷走神经传出纤维的起源及迷背核的亚核构筑—HRP法研究

将CB—HRP及HRP溶液注入鸡颈迷走神经干的起始端附近,逆行追踪迷走神经的起源,并结合Nissl氏法对迷背核进行亚核划分。结果如下:(1)迷走神经运动神经元位于延髓的迷背核、疑核、中间带、中间核、中介核、舌咽神经腹侧核、孤束核内侧亚核及第1、2颈髓的中央管附近、中间带、腹角等处。迷走神经背核的树突明显伸向第4脑室膜下及孤束核。(2)根据迷背核内神经元的形态、大小、位置、排列等因素将其划分为八个亚核:尾小细胞亚核、尾中细胞亚核、大细胞亚核、多型细胞亚核、背小细胞亚核,背中小细胞亚核、腹小细胞亚核、前小细胞亚核。     

基于“合作剩余”的西部资源型产品最终加工原产地化路径研究

从公共治理视角出发,对西部资源型产品最终加工原产地化的运行模式进行研究,提出了＂合作治理＂的新模式,并对其运行机理进行了分析和探讨。     

Facultative apomixis and chromosome doubling are sources of heterogeneity in citrus rootstock trials: Impact on clementine production and breeding selection

All commercial citrus rootstocks are polyembryonic and propagated by seeds. Although these seeds produce uniform plant material most of the time, zygotic or polyploid citrus seedlings may arise. The aim of this study was to understand how zygotic or tetraploid rootstock could affect a citrus rootstock selection field trial. A trifoliate orange selection field trial, which was planted in 1974 and grafted with clementine, was re-investigated with respect to the presence of rootstocks that were not true-to-type. Among the 288 trees investigated, flow cytometry identified 2.4% of rootstocks as tetraploid and SSR markers indicated that 6.6% were zygotic. Yield data showed that the presence of tetraploid rootstock dramatically decreased (by about 45%) clementine fruit production. However, zygosity did not always affect fruit production and a range of effects were observed, from a slight increase in production to a 24% decrease. Exclusion of non-true-to-type genotypes from the production analysis indicated that the best candidate for rootstock was a clone previously ranked in the middle of the 32 rootstocks under evaluation. However, the presence of zygotic rootstock did not appear to cause any significant differences in fruit quality during the first 5 years of the investigation, which suggests that non-true-to-type plants cannot be identified by fruit quality parameters. This study indicates that tetraploid and zygotic rootstocks have a strong impact on citrus fruit production in orchards, and removal of off-type seedlings is required prior to planting in any agronomic trial.     

Genetic diversity and phylogenetic relationships of Prunus microcarpa C.A. Mey. subsp. tortusa analyzed by simple sequence repeats (SSRs)

Prunus microcarpa C.A. Mey. subsp. tortusa is a deciduous shrub well adapted to severe winter and dry-hot summer conditions. As the first step to explore the genetic and horticultural potential of P. microcarpa C.A. Mey. subsp. tortusa, we used SSRs to elucidate the genetic variation within its populations dispersed in upper Mesopotamia. We also investigated its phylogenetic relationship with economically important Prunus species; almond, apricot, sweet cherry, peach and plums. Using 47 amplifying SSR primer pairs, 63 P. microcarpa C.A. Mey. subsp. tortusa genotypes sampled from five locations and 15 cultivars belonging to other Prunus species were assayed. The cross-species transportability of SSRs was 96% indicating a high degree of homology between P. microcarpa C.A. Mey. subsp. tortusa and the other Prunus species. The genetic distance between P. microcarpa C.A. Mey. subsp. tortusa genotypes belonging to a particular geographic site was lower than that between genotypes of different geographic origins. Cluster analysis differentiated P. microcarpa C.A. Mey. subsp. tortusa genotypes according to their geographic sites and separated them from the other Prunus species. P. microcarpa C.A. Mey. subsp. tortusa and sweet cherry, the subgenus Cerasus, were located in the same major cluster, the other Prunus species, belonging to the subgenera Amygdalus and Prunus, were located in another one. The analysis of molecular variance (AMOVA) revealed that genetic variation among individuals within populations (59.10%) was much higher than among Prunus groups (29.28%) and among P. microcarpa C.A. Mey. subsp. tortusa populations of different geographic sites (11.61%). The results indicate a substantial genetic diversity in P. microcarpa C.A. Mey. subsp. tortusa and the need of exploring a wider area to increase the chance of finding a particular genotype.