不同地理群体三疣梭子蟹mtDNA本底甲基化水平分析     

闻奋亮  王银海  赵莲  赖晓芳  阎斌伦  高焕 《海洋渔业》2017,39(2)

利用重亚硫酸盐测序法,对适于三疣梭子蟹(Portunus trituberculatus)线粒体基因组甲基化分析的BSP(Bisulfite sequencing PCR)引物进行了筛选,在设计的21对引物中,获得了12对BSP引物。利用这12对引物分析了三疣梭子蟹海州湾群体(江苏连云港)和莱州湾群体(山东东营)线粒体基因组本底甲基化水平,结果表明:海州湾群体不存在甲基化现象,莱州湾群体发现了2个个体在ND2基因(NADH脱氢酶亚基2)位点存在甲基化现象;在存在甲基化的个体中,甲基化类型主要为CHG和CHH类型,还有少量Cp G类型。该研究结果说明,莱州湾群体和海州湾群体线粒体基因组本底水平上的甲基化特征存在一定差异,相关研究值得进一步深入探讨。  相似文献   

Discrimination between Japanese and Chinese Products using trace elements concentration of kernel in pickled Japanese apricot     

《Soil Science and Plant Nutrition》2013,59(1)

pp. 875–880

The trace-element composition of kernel in pickled Japanese apricot (Prunus mume Sieb. et Zucc.) was determined using an inductively coupled plasma optical emission spectrometer in order to distinguish between Japanese products and Chinese products.

Strontium and barium concentrations in the kernels of Chinese products were 10 or more times those of the Japanese ones. When based on 8.0 mg kg^?1 of strontium concentration in kernel, 93.2% of sample was distinguished as Japanese products or Chinese ones.

Applying principal component analysis using 9 elements (Mn, Zn, Fe, Ni, Ba, Sr, Cu, Co, Cr), the pickled Japanese apricots tend to separate into two countries. Linear discriminant analysis (LDA) using 9 elements allowed a reasonable classification of pickled Japanese apricots according to the country of production.

The result of the analysis of K-nearest neighbors (KNN) was better than that of LDA.  相似文献   

琼中县特色产业发展现状及对策     

杨衍  孙继华 《热带作物学报》2013,33(10):95-99

结合琼中县地理位置、气候条件等地域状况，阐述琼中县11种主要农业产业发展的现状及其产业特点，简要介绍各乡镇自主发展的特色产业情况。针对琼中县农业产业发展状况，提出巩固与提升绿色农业、着力建设琼中农业产业品牌的建议。  相似文献   

北京农产品地理标志认知的实证分析     

张玥琦  刘兵  隋文香  李华 《北京农学院学报》2015,30(3):116-119

基于消费者对北京农产品地理标志认知情况的实际调查,分析消费者对北京农产品地理标志的认知现状及原因。研究表明,北京农产品地理标志存在认知相对较低、宣传力度不够和品质独特性较低等问题,提出提升北京农产品地理标志认知水平的政策建议。  相似文献   

Effect of Temperature on the Induction of Bud Dormancy in Ecotypes of Betula pubescens and Betula pendula     

《Scandinavian Journal of Forest Research》2012,27(3):208-217

The purpose of this study was to determine the influence of temperature applied during short day-induced budset on induction of dormancy in six ecotypes of Betula pubescens Ehrh. and two ecotypes of Betula pendula Roth. Seedlings were grown in a phytotron at constant temperatures of 9–21°C under a 12 h photoperiod (SD) during dormancy induction. Induction of dormancy was monitored by following bud flushing and shoot growth after transfer to long photoperiod conditions (24 h) at 18°C. Chilling requirement was studied in seedlings exposed to 10 weeks of SD. In both species induction of bud dormancy developed most rapidly at 15–18°C, and both 9–12°C and 21°C delayed the induction of dormancy. Raising the temperature (from 9 to 21°C) applied during induction of dormancy significantly increased the chilling requirement. These responses were noted for all ecotypes tested, but in general the northern ecotypes entered dormancy more quickly than the southern ones. No such trend was recorded for chilling requirement, although a B. pubescens ecotype from Iceland and another from the coast of northern Norway appeared to require a longer chilling treatment than the other ecotypes. In conclusion, induction and depth of bud dormancy in birch are significantly affected by temperature conditions and these effects may explain some of the annual variation in dormancy and chilling requirement observed in nature.  相似文献   

河北省薄罗藓科植物分类的初步研究   总被引：3，自引：0，他引：3  

李秀芹  赵建成 《干旱区研究》2001,18(3):20-24

报道了河北省薄罗藓科植物6属共12种（含1变种），其中中国新记录种1种：北方假细罗藓Pseudoleskeella papillosa(Lindb.)Kindb.；河北省新记录属2属：薄罗藓属Leskea Hedw.和褶藓属Okamuraea Broth.；河北新记录种7种：薄罗藓Leskea polycarpi Hedw.，细枝藓Lindbergia brachyptera(Mitt.)Kindb.，细枝藓疣齿变种L. brachyptera var.austinii (Sull.)Grout.,阔叶细枝藓L. brevifolia(Gao)Gao，瓦叶假细罗藓Pseudoleskeella tectorum(Brid.)Kindb.,褶藓O.hakoniensis(Mitt.)Broth.和短枝褶藓O.brachydictyon(Card.）Nog..本文根据标本编制了河北省薄罗藓科植物分属、种检索表，简要讨论了其生境行理分布特点。旨在为河北省乃至中国苔藓植物的系统研究及苔藓植物资源的开发利用提供可借鉴的资料。研究标本保存在河北师范大学植物标本室（HBNU)。  相似文献   

Biological activity and characterization of nucleopolyhedrovirus isolates ofSpodoptera litura     

C. M. Senthil Kumar  R. J. Rabindra  N. Sathiah 《Phytoparasitica》2006,34(1):92-101

Geographical isolates ofSpodoptera litura (Fabricius) (Noctuidae: Lepidoptera) nucleopolyhedrovirus (SpltNPV), collected from different parts of India and maintained at Tamil Nadu Agricultural University, were compared for their biological activity and subjected to Restriction Endonuclease (REN) analysis. Neonate and second instar bioassay studies revealed similarity in biological activity as shown by the overlapping fiducial limits of LC₅₀ values. However, there were differences in yield among isolates: significantly higher yields were obtained from isolates UAS and CBE than from the BARC isolate. REN analysis of the four isolates withPst I,Hind III,Bam HI andEco RI enzymes indicated genotypic variation among the isolates. Based on the commonality of the bands, the isolates could be broadly divided into two groups: isolates AU and CBE formed one group, and the other group comprised UAS and BARC based on genetic relatedness. http://www.phytoparasitica.org posting Nov. 21, 2005.  相似文献   

安徽省烟草黑胫病菌的交配型及其地理分布研究   总被引：7，自引：0，他引：7  

马国胜  高智谋 《植物病理学报》2006,36(6):566-568

 Total 69 isolates of Phytophthora nicotianae var. nicotianae were isolated and identified from tobacco black shank samples collected from different areas of Anhui province, and mating types of the oomycete were investigated by the method of partnership culture in vitro on L-tryptophan medium with β-sitosterol. The results showed that A2 mating type was the predominant in isolates of P. nicotianae var. nicotianae, next was A₀ mating type, A₁ and other mating types were not observed. It was suggested that sexual reproduction of P. nicotianae var. nicotianae might not take place frequently, and Anhui province might not be the original center of P. nicotianae var. nicotianae. The results indicated further that mating type geographical distribution of P. nicotianae var. nicotianae in Anhui province was in line with that in China. In addition, the significance of the test results and the possible reason for A₁ mating type being absent were discussed.  相似文献   

青藏高原东部雨季降水量分布模型的建立   总被引：1，自引：3，他引：1  

罗琦  李栋梁  张杰 《干旱区研究》2007,24(6):766-772

采用高分辨率的3"数字高程模型资料和青藏高原东部102个常规气象观测站5～9月份的降水资料,根据降水随高度分布将站点分为3类,采用多元逐步回归的方法,建立了青藏高原40年(1961-2000年)雨季逐年降水量和经度、纬度、海拔高度、坡度、坡向、开放度等地理、地形因子之间的关系模型,估算了青藏高原地区降水量的空间分布.结果表明:建立的关于青藏高原降水量与诸因子之间方程的相关性显著,相对误差在20%,平均相对误差在4.4%之内,估算模型的相关系数均通过置信度为0.95 的检验;并且地理地形因子对40年平均和逐年降水量分布特征的影响较为稳定,其归一化的模拟系数基本控制在±1之间,这对定量分析和评价站点稀少、地形复杂的高原降水有重要意义.  相似文献   

内蒙古景天属植物分类及其区系生态地理分布研究     

呼格吉勒图  赵一之  宝音陶格涛 《干旱区资源与环境》2007,21(4):132-135

本文试图澄清内蒙古究竟有多少种景天属植物,这些植物在内蒙古的生态分布情况。我们应用形态—地理分类的方法,对内蒙古景天属Sedum植物进行认真研究。研究认为:《内蒙古植物志》第二版记载的北景天(Sedum kamtschaticum Fisch.)和兴安景天(Sedum hsinganicumChu.)应为费菜;确定了兴安景天(Sedum hsinganicum Chu.)和费菜(Phdeimusaizoon L.)为温带亚洲分布种;阔叶景天(Sedum roborowskii Maxim.)为青藏高原东部分布种;藓状景天(Sedum polytrichoides Hemsl.)为中国-日本分布种;内蒙古景天属植物从东部渗入了1种东亚成分,从西南部渗入了1种青藏高原成分。  相似文献