Mapping QTL of Fiber Yield and Quality Traits in F2 Populations of Chromosome Segment Substitution Lines from Gossypium hirsutum × Gossypium barbadense     

Guo Lixue  Shi Yuzhen  Li Junwen  Gong Juwu  Liu Aiying  Shang Haihong  Gong Wankui  Chen Tingting  Ge Qun  Sun Jie  Yuan Youlu 《棉花学报》2015,27(6):550-560

In this study, F₂ populations from two chromosome segment substitution lines MBI7455 and MBI7358, were quantified using SSR to evaluate the parents' genotype and detect QTL related to fiber quality plus yield traits of cotton. Results show that the recurrent parent (CCRI45) hosted 96.70% and 95.60% of chromosome segment substitution in MBI7455 with 12 chromosome segments and in MBI7358 with 16 chromosome substitution segments of Gossypium barbadense, respectively. In the F₂ population, the average rate of chromosome substitution of the recurrent parent (CCRI45) was 96.44%, and the average segments of chromosome substitution of Gossypium barbadense was 13.42, with an average segments of homozygous donor chromosome value of 3.90. Analysis showed 19 fiber quality-related QTL with a phenotypic variance of between 2.52%-13.11% and seven yield traits-related QTL with a range of 2.93%-11.40% phenotypic variance, resulting in a total of 26 QTL. The CSSLs could be used to detect QTL for fiber yield and quality traits, which offer an important foundation for the cotton molecular-assisted breeding.  相似文献   

Association between weight change during initial chemotherapy and clinical outcome in dogs with multicentric lymphoma     

Wei‐Shan Lee  Jih‐Jong Lee  Albert Taiching Liao  Chia‐Lien Kao  Shang‐Lin Wang 《Veterinary and comparative oncology》2021,19(1):53-60

The majority of the known prognostic factors in dogs with lymphoma have been evaluated before treatment commences or at the time of diagnosis. Prognostic factors evaluated during the initial phase of treatment are less described but may provide important clinical information. In this retrospective study, 82 canine lymphoma patients were categorized according to the weight change between diagnosis and after 5 weeks of chemotherapy. Dogs that gained greater than 5% or lost greater than 5% of initial body weight were categorized as increased‐ or decreased‐weight groups, respectively. Those in which weight changed less than 5% were categorized as the maintained‐weight group. The median progression‐free survival (PFS) in the increased‐weight group, maintained‐weight group and decreased‐weight group was 226, 256 and 129 days, respectively. The decreased‐weight group had significantly shorter PFS than the increased and maintained groups (P = .023, P = .003, respectively). The median survival time (ST) in the increased‐weight group, maintained‐weight group and decreased‐weight group was 320, 339 and 222 days, respectively. There was no significant difference in ST among the three groups (P = .128). In Cox‐regression results, weight change group and initial body weight were significant risk factors associated to PFS (P = .007, P = .001, respectively) while only patient's initial body weight was a significant risk factor to ST (P = .013). In conclusion, evaluation of initial body weight and weight changes over time can provide valuable information regarding PFS and ST in dogs with multicentric lymphoma.  相似文献   

基于定向定量堆放的马铃薯收获机设计   总被引：1，自引：0，他引：1  

潘志国  尚书旗  杨然兵  于镇伟  马庆驰 《农机化研究》2015,(8):88-91

在研究小型马铃薯收获机的基础上,设计了一款能根据收集薯块质量往特定方向堆放的马铃薯收获机,主要由挖掘装置、输送装置及定向定量堆放装置等组成。在马铃薯收获机的后部设计一个四分区临时集薯器,能根据所收获马铃薯的质量来打开集薯器,将收集的马铃薯向中间或者一侧堆放,从而实现了马铃薯的连续挖掘及收集薯块的定向定量间隔堆放,可在较大程度上降低人工捡拾的工作量,同时避免拖拉机碾压伤薯。  相似文献   

基于CPLD的漏播检测装置的设计与测试     

赵艳华  龚丽农  尚书旗  王延耀  于艳 《农机化研究》2015,(9):126-130

针对现有漏播检测装置并行性差、响应速度慢等不足,提出一种新型的漏播检测装置。该装置采用复杂可编程逻辑器件(CPLD)作为检测控制核心,能够同时提供8路落种检测,适用于大型精密穴播机械。该检测装置采用光电器件作为落种传感器,响应快速准确。6对红外对管采用特殊方式排列在排种管的相对两侧,避免光线干涉,提高检测精度。该装置适用于检测直径3mm以上种子(如麦粒、黄豆、玉米粒等),能够配合上位机GPS精确定位漏播位置,为漏播后的补种修正提供位置和数目信息。手工落种测试时,对小麦、黄豆、玉米种子的检出率可达100%。将该装置在播种试验台上进行实验,统计自动落种数目,精度可达95%以上;对单粒漏播进行报警统计,精度可达80%以上。改进试验台实验条件,以自适应方式运行可以使装置的检测精度进一步提升。  相似文献   

地熊蜂为重庆地区设施番茄授粉的效果研究     

罗文华  曹兰  程尚  王瑞生  戴荣国  殷素会  梁明荣  刘佳霖 《长江蔬菜》2016,(14):47-49

为评价地熊蜂在重庆地区设施番茄的授粉效果,在重庆市荣昌区龙舌嘴村开展授粉效果比较试验,分析地熊蜂授粉对设施番茄产量、果实品质及畸形果率的影响。试验结果显示,经地熊蜂授粉的设施番茄平均产量为2 206.44 kg/667 m2,与未授粉组相比显著提高了104.95%,授粉组的单果质量、果纵径、果最大横径、可溶性固形物含量、VC含量及总糖含量显著高于未授粉组。由此,认为地熊蜂适宜为重庆地区设施番茄授粉,且能够显著提高重庆地区设施番茄的产量与品质。  相似文献   

中德职教师资队伍建设的比较   总被引：1，自引：0，他引：1  

商秀梅  刘培军 《北京农业职业学院学报》2007,21(5):71-73

德国职教师资的优势在世界上是有日共睹的.通过比较中德职教师资的来源、师资资格要求、教师地位与待遇、教师的进修培训等四个方面,应做到师资来源正规化与多元化,完善职教师资准入与发展的政策;建立健全中国特色的职教教师资格认定制度;采取实际行动,大力提高职教教师工资,完善职教经费的管理体制;重视职教教师的可持续发展.  相似文献   

柔性坐标测量机参数辨识方法   总被引：3，自引：1，他引：3  

汪平平  费业泰  尚平  程文涛 《农业机械学报》2007,38(7):129-132

设计了一种六自由度关节式柔性坐标测量机,并对该测量机测量方程中的参数进行了辨识,提出了一种快速简易的单点锥窝标定方法。该方法基于单点锥窝提供的空间单点基准,利用非线性最小二乘中的高斯-牛顿法,求解测量机测量方程的参数值。实验结果表明,该方法能够有效提高测量机的整体精度,且操作简单、计算效率高。  相似文献   

Method to Analyze and Evaluate the Depth Profile of the Three Dimensional Residual Stresses State with X-ray   总被引：1，自引：0，他引：1  

CHEN Yu an  ZHOU Shang qi  HAN Xian bing 《保鲜与加工》2002,(1):40-43

  相似文献   

土壤采样器采样过程动力学仿真分析     

温福军  王尚  赵新  吕恩利 《农机化研究》2015,(9):65-69,82

为研究土壤采样器在采样过程中的工作特性,建立了土壤模型;运用ANSYS的LS-DYNA对土壤采样器与土体的采样过程进行动力学仿真分析,并用瞬时动力学方法分析了采样筒贯入土体的动态过程。同时,通过LS-PREPOST后处理软件得出了土体中应力场的分布图,分析了土体中的应力分布,分析了贯入时对土样的扰动情况:采样过程中,土体的轴向压缩量在采样筒头部与土壤接触处最大,而土样中心部位较小。  相似文献   

中国对虾育苗时间与温度的关系及其应用   总被引：2，自引：0，他引：2  

商兆堂  蔡士来 《中国农业气象》1997,18(2):40-42

根据多年的调研和试验资料，利用非线性积温模型，模拟了对虾幼体各发育阶段所需天数与水温的关系。在此基础上研究确定了亲虾产卵孵化期的气候决策模式；并应用模式计算出了我市亲虾产卵孵化的适宜时段。为亲虾适宜产卵孵化期的决策提供了科学方法。  相似文献