Analysis of parental effects on mean vine maturity and chip colour of 4x.2x potato progenies     

R. C. B. Hutten  M. G. M. Schippers  J. Eising  P. M. van Til  J. G. Th. Hermsen  E. Jacobsen 《Euphytica》1996,88(3):175-179

Summary The parental effects on progenies from potato 4x.2x(FDR) crosses were analyzed to determine anether and to what extent selection criteria used for selecting tetraploid breeding lines have to be adjusted when selecting diploid breeding lines. For vine maturity and chip colour multiple regression analysis of progeny means on means of diploid and tetraploid parents revealed high coefficients of determination (R²) for both characters, indicating good predicting power of the performance of both diploid and tetraploid parents on the performance of their 4x.2x progenies. For vine maturity the multiple regression slope for the tetraploid perents was significantly larger than for the diploid parents, and progeny means were towards the tetraploid parents. This indicates that selection criteria for vine maturity may be less stringent at the diploid level. However, diploids may be earlier maturing than tetraploids and therefore selection criteria can better be similar at both ploidy levels. For chip colour, multiple regression slopes for diploid and tetraploid parents were similar and progeny means were towards the darkest coloured parent irrespective of its ploidy level. This indicates that selection of breeding lines for chip colour can be conducted similarly at both ploidy levels.  相似文献   

Comparative performance of diploid and tetraploid progenies from 2x.2x crosses in potato     

R. C. B. Hutten  M. G. M. Schippers  J. G. Th. Hermsen  E. Jacobsen 《Euphytica》1995,81(2):187-192

Summary Selection criteria for agronomic characters in a potato breeding program at the diploid (2x) level may differ from selection criteria used when selecting breeding lines at the tetraploid (4x) level. Differences between selection criteria are expected, (1) when expression of the characters is different at both ploidy levels and/or (2) when the effect of diploid breeding lines on agronomic characters of tetraploid progenies is different from the effect of tetraploid breeding lines. In this investigation sets of diploid and tetraploid progenies, each set derived from the same 2x.2x cross, were compared as to the expression of six agronomic characters. Diploid progenies had significantly lower yields (due to smaller tubers) and significantly higher under water weights than tetraploid progenies. Vine maturity and chip colour were similarly expressed at both ploidy levels. Correlations between yield and yield components, and between under water weight and chip colour were similar at both ploidy levels. The lower yields and higher under water weights found in diploids point to the need of different selection criteria for selecting diploid and tetraploid breeding lines.  相似文献   

滚动轴承数显测试仪的研制   总被引：1，自引：0，他引：1       下载免费PDF全文

赵秀珍  王乃钊  王金星  张军 《农业工程学报》1997,13(2):189-192

介绍了新型计量仪器——滚动轴承数显测试仪的结构、功能、工作原理、技术指标、模拟电路设计、８０９８单片微机系统的硬件及软件设计等。  相似文献   

以温度为主控参数的日光温室综合环境控制系统的研制与应用   总被引：12，自引：3，他引：12  

李志伟  王双喜  高昌珍  张亮和  楮清河 《农业工程学报》2002,18(3):68-71

针对目前日光温室综合环境调控存在的问题，在研究日光温室微生态环境变化机理的基础上，以温度为主元的基本理论，利用动态规划理论，建立了以温度为主参量的日光温室综合环境调控模式，利用8031单片微型计算机实现了对日光温室综合环境的动态优化平衡调控，经济有效地解决了日光温室环境多因素的检测调控难题，取得了良好的社会效益和可观的经济效益。  相似文献   

单片机多段补偿流量仪     

Liu Guibin Wang Shiyao 《大连水产学院学报》1994,(Z1)

本文介绍一种用单片机对大口径管道输送原油用的腰轮或刮板流量计进行多段自动补偿的方法，大大提高了流量计的精度和寿命，把流量计从０．２级提高到０．１级，对输油的交接计量提供了可靠的依据。  相似文献   

实验仿真板在毕业设计教学中的应用     

蒋淑霞 《中南林学院学报》2006,26(5):125-128

工科类单片机毕业设计中由于实验设备不足，不可能让每个设计都通过单片机的实验来验证，达不到毕业设计应有的效果．提出一种单片机实验仿真板Ledkey和Simboard并应用毕业设计教学中，以交通运输专业的单片机系统开发设计为例加以说明．结果表明，设计手段形象直观，设计成本低、效果好．该仿真实验板在单片机系统开发毕业设计中有着广泛的应用前景．  相似文献   

播种机速度自动检测的硬件及软件设计     

李剑峰  高晓阳 《甘肃农业大学学报》2007,42(1):92-95

为提高播种机的工作质量和自动化水平,研究设计了一种播种机排种自动控制装置.本文报道其中的播种机工作速度自动检测装置.本检测系统采用了光电式转速传感器将机具前进速度信号转化成脉冲信号,输入单片机进行推理得出机具的前进速度.采用汇编语言和模块化的程序设计方法,开发出了一套能自动检测播种机在工作过程中前进速度的软件程序.实验表明,使用MCS—51系列单片机及传感器组成的硬件测试系统实现了对播种机速度的实时检测和显示.  相似文献   

DNA芯片技术研究进展   总被引：5，自引：0，他引：5  

胡建宏  于永生  江中良  李青旺 《湖北农学院学报》2002,22(1):92-96

DNA芯片技术是近年来发展迅猛的生物高新技术，它是利用光刻合成、高速打印或电定位等技术，在支持物硅、玻璃或尼龙膜上胺照特定的排列方式有序地固化大量的基因探针，形成DNA微阵列。生物样品DNA／RNA通过PCR／RT－PCR扩增和荧光标记后与DNA微阵列杂交，通过荧光扫描器及计算机分析，即可获得样品的基因序列及表达的信息。  相似文献   

基于AT89S51的蔬菜大棚温控系统设计     

王慧 《农业科技与装备》2011,(8)

以AT89S51单片机为控制核心,以数字温度传感器DS18B20为测温元件,采集温室内的温度信息。通过对当前温室环境的现状进行分析,对温室温度参数进行调节,以达到栽培作物生长发育的需要,为作物的生长提供最适宜的温度环境,大幅提高作物的产量和质量。  相似文献   

基因芯片技术检测5种马病毒   总被引：8，自引：0，他引：8  

朱来华  梁成珠  陆承平  吴华  杨元杰  马丰忠  王树峰  于红光 《农业生物技术学报》2006,14(2):203-207,i0002

通过分子克隆技术获得马疱疹病毒1型(Equineherpesvirus1,EHV1)、马动脉炎病毒(Equinearteritisvirus,EAV)、马流感病毒(Equineinfluenzavirus,EIV)、马传染性贫血病毒(Equineinfectiousanaemiavirus,EIAV)和东部马脑脊髓炎病毒(East-ernequineencephalomyelitisvirus,EEEV)等5种病毒各一段高度保守的特异性基因片段,用芯片点样仪逐点分配到处理过的玻片上,制备成检测芯片。提取样品中的RNA,进行反转录和荧光标记后滴加到芯片上进行特异性杂交,对杂交结果进行扫描检测和计算机软件分析。结果显示,制备的基因芯片可同时检测和鉴别上述5种病毒,可检测到阳性杂交信号的最高稀释度为10-6的病毒液,约25个病毒DNA拷贝,但其它病毒材料未见红色荧光信号,证明了本方法的特异性。在进口马的隔离检疫期间,采集马鼻肺炎、马动脉炎中和抗体阳性但病毒分离阴性马匹的白细胞悬液,分别在EHV1和EAV位点处可检测到阳性杂交信号。证明基因芯片技术不但快速、准确和敏感,而且可同时进行多种病毒的检测。  相似文献