小麦远缘杂交后代节燕98-2分离类型贮藏蛋白的研究     

吴春太  徐如宏  张庆勤 《种子》2004,23(1):3-5,30

采用A-PAGE和SDS-PAGE聚丙烯酰胺凝胶电泳方法,对远缘组合分离出来的节燕98-2类型入选11个遗传性基本稳定的具有高产、多抗的小麦株系的醇溶蛋白和高分子量谷蛋白亚基进行了分析.结果表明,在A-PAGE电泳分析中,11个供试株系具有11种不同的醇溶蛋白带型.在SDS-FAGE电泳分析中,出现了7种不同的高分子量谷蛋白亚基(HMW-GS)及6种亚基组合类型,优质亚基及亚基组合所占的比例较少,品质评分偏低,其变幅为5～8分,平均为6.36分.但在所分析的材料中,出现了一个少见的特殊亚基:2 10 12.并研究了这些HMW-GS和组合频率及特点.11个株系中7个具有45 10优质亚基和2个具有2*亚基,它们可供小麦优质育种利用.研究表明,通过远缘杂交能够选育出具有高产、抗病和优质的小麦新材料.  相似文献   

论塞罕坝森林－草原交错带林业发展策略     

王建中  黄金祥  冯天杰  钱进源  胡永富  张向忠  赵亚民  倪志云  李盼威 《河北林果研究》1995,(4)

在分析塞罕坝林场基本情况、存在问题及优势条件的前提下，提出了该场的林业发展策略：以林为本，林以育为主，育以科学为基础；育林、护林、造林、改造和调整相结合；以木材生产为龙头，以森林旅游和多种经营为双翼，以山草盆花生产及森林食品开发为凤尾，林、工、商、贸综合发展。文中就森林经营、木材加工、森林旅游、植物资源开发、动物养殖以及资源多样性保护提出了策略性建议。  相似文献   

夏秋蚕新品种浒花、秋星的育成及其一代杂交种的选配     

何毅  司马杨虎 《蚕业科学》1991,17(4):200-207

根据长江流域夏秋季的气候特点,采用杂交、回交、系统分离、活蛹缫丝和多代高温多湿环境定向培育等育种方法,分别育成了中系蚕品种“浒花”和日系蚕品种“秋星”。两者都具有抗性强、丝量高、茧丝质优以及繁育容易等特点。其一代杂交种经多次实验室鉴定、农村生产鉴定、试养以及全国蚕品种审定结果表明:该新品种体质强健、孵化、眠起、老熟齐一,茧丝量高,茧层率22％;鲜毛茧出丝率15—16％,茧丝品质优良、解舒率74％,净度93分,茧丝纤度2.53/D,茧丝长超1000m。  相似文献   

早生桑品种育151、育237的育成   总被引：1，自引：1，他引：0  

孙晓霞  施炳坤等 《蚕业科学》1990,16(1):1-4

采用杂交方法育成早生桑品种育151、育237,具有发芽早、产叶量高,叶质较优、抗黄化型萎缩病较强等特性,发芽期比早青桑捉早2-3天.比湖桑32号早8天左右.产叶量提高6-41%.  相似文献   

Prediction of breeding values for osseous fragments in fetlock and hock joints, deforming arthropathy in hock joints, and pathologic changes in the navicular bones of Hanoverian Warmblood horses     

K.F. Stock 《Livestock Production Science》2005,92(1):77-94

The results of a standardised radiological examination of 5928 Hanoverian Warmblood horses selected for sale at auction were used to predict relative breeding values (RBV) in the 23,662 horses included in the last four generations of the probands' pedigrees. The distribution of the RBV was investigated in the whole four-generation pedigree, in the probands and in those stallions that contributed at least three offspring to the probands. The RBV of the probands' sires were further compared with the officially published performance-based relative breeding values, i.e., total indices dressage (TID) and jumping (TIJ). The sires' level of dressage indices was considerably higher (mean TID=110) than of the jumping indices (mean TIJ=98). Total indices radiographic findings (TIR) were calculated for the sires with varying weighting given to the individual RBV. In each case, this resulted in a mean TIR of 99. Finally, total indices were derived from TIR and TID and/or TIJ in order to develop different selection schemes for all-purpose breeding and for breeding focused on dressage and show jumping. All breeding values under consideration increased by between 1% and 19% when radiographic findings were weighted with between 30% and 60% complementary to the corresponding performance parameters, and when only sires were selected with above average total indices. At the same time, the prevalences of the radiographic findings investigated here were lowered by up to 10% each. When only one radiographic finding was considered at a time, the maximum attainable response to selection was a 16-23% increase in the relative breeding values and a relative decrease in prevalences of radiographic findings of between 31% and 52%. The results of this study indicate that it is possible in horse breeding to consider simultaneously health and performance traits. Medical data should be included in the prediction of breeding values in order to improve the radiological status of today's riding horses.  相似文献   

Breeding objectives for beef cattle used in different production systems: 2. Model application to production systems with the Charolais breed     

M. Wolfová  J. Wolf  J. P?ibyl  E. Krupa 《Livestock Production Science》2005,95(3):217-230

A general bio-economic model for beef cattle production was used to define breeding objectives for Charolais cattle to be utilized in a variety of linked production systems. Economic weights were calculated for 16 traits (some with both direct and maternal components) in three production systems (pure-breeding and terminal crossing with beef or dairy cows) and two marketing strategies (sale or fattening of weaned surplus calves). Economic weights for the total breeding objective were calculated as weighted averages, where weights were numbers of cows expected to be mated with Charolais bulls in each production system and marketing strategy. Results suggest that the direct component of calving performance and cow longevity were of primary economic importance in all systems. Conception rate of cows and weaning weight reached about 50% of the standardized economic weight of calving performance in purebred systems with sale of weaned calves, whereas in purebred systems with fattening the economic importance of the direct component of cow conception rate, losses at calving, mature weight of cows, weaning weight, and fattening traits were of equal importance (each approximately about 20% that of calving performance). In terminal crossing systems, weaning weight was important when calves were sold at weaning, and fattening traits were important for systems selling fattened animals. The bio-economic model performed well under the conditions of this demonstration and could easily be customized for other applications.  相似文献   

万寿菊的研究进展   总被引：24，自引：0，他引：24  

张继冲  续九如  李福荣  沈一岚 《西南园艺》2005,33(5):17-20

本文概述了万寿菊的主要品种、形态特征、生物学特性、香气组成成分、功能用途、栽培管理方式及育种等内容，并对万寿菊的发展前景作了展望．  相似文献   

苜蓿育种几个问题的探讨   总被引：6，自引：0，他引：6  

陈立波  张力君刘磊 《中国草地》2005,27(5):75-78

在对主要苜蓿遗传资源与遗传特性进行陈述的同时, 重点对苜蓿遗传特性与育种进程的关系、目前常见的育种方法以及苜蓿育种的发展现状进行了阐述,并就近年来我国在苜蓿育种领域内存在的主要问题进行了分析,旨在为今后的苜蓿育种工作提供参考依据。  相似文献   

坪用野牛草种质资源搜集及品种选育研究进展   总被引：3，自引：0，他引：3  

胡晓艳 李敏杨青川  呼天明 《中国草地》2005,27(6):54-60

野牛草是一种抗逆性强、管理粗放的草坪植物,非常适合我国一些缺水城市水土保持和园林绿化的需要,但也存在绿期较短、颜色较浅、雄株坪用景观不好等缺点.近年来,通过对野牛草种质资源进行鉴定和评价,从中选择了大量优良的种质材料,使其坪用缺点逐步改善,并利用有性杂交和生物技术等育种手段培育出了许多优良坪用品种.  相似文献   

辣椒新品种镇江3号的选育     

马志虎  宋春 《辣椒杂志》2003,(3)

中晚熟杂交一代辣椒镇研3号是以江苏本地羊角椒自交系Y9007为母本,由甘肃酒泉引进的甜椒自交系T9218为父本配制的一代杂交组合。镇研3号为中熟辣椒品种,果形为牛角形,纵径15cm,肩横径5.0cm、肉厚0.40cm,单果平均重42g。果面光滑,青熟果绿色、味微辣,风味佳,适宜在长江流域或南方保护地栽培种植,667m2产量约为4200～5000kg。  相似文献