助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   backcross 的翻译结果: 查询用时:0.011秒
图标索引 在分类学科中查询
所有学科
农作物
园艺
水产和渔业
畜牧与动物医学
生物学
植物保护
蚕蜂与野生动物保护
农艺学
林业
更多类别查询

图标索引 历史查询
 

backcross
相关语句
  回交
     The cytogenetics of the backcross generations and self-bred progenies (BC2F1, BC3F1, BC2F2,BC3F2 and BC2F3) of intergenetic hybrid of Triticum aestivum L. × Eremopyrum orientale (Ledeb) Jaub.
     对普通小麦(TriticumaestivumL.)与东方旱麦草(Eremopyrumorientale(Ledeb)Jaub.etspach)属间杂种的回交和自交不同世代(BC2F1、BC3F1、BC2F2、BC3F2和BC2F3)进行了细胞遗传学研究。
短句来源
     Seed Set Rate of Backcross of (Chinese Spring ph1b Mutant×Aegilops)F 1 with Chinese Spring ph1b Mutant and Cytology Study of Their BC 1F 1 Plants
     中国春ph1b突变体对(中国春ph1b突变体×山羊草)F_1回交结实率及BC_1F_1细胞学研究
短句来源
     The efficiency of backcross in combination of small/big grain continued from B_1F_1 to B_3F_1;
     回交的效应在小粒×大粒类型的组合中可以从B_1F_1持续到B_3F_1;
短句来源
     A mapping population of 98 backcross inbred lines(BC1F12),derived from a backcross of Nipponbare(japonica)/Kasalath(indica)//Nipponbare by the single seed descent methods,was employed to map quantitative trait loci(QTL)of 4 traits relating to outcrossing in rice by composite interval mapping method.
     利用由98个家系组成的Nipponbare/Kasalath//Nipponbare回交重组自交系(backcross inbred lines,BIL)作图群体(BC1F12),用复合区间作图方法(CIM),对水稻4个异交相关性状进行了QTL分析。
短句来源
     The F1, backcross F1 and F2 population were established from crosses between Glutinou89-1 and Hongmangnuo, Fuhui838, Minghui63, Ce64. Overwintering ability and genetic variation of main agronomic traits were analyzed in different seasons.
     (2)用糯稻89-1与红芒糯、明恢63、辐恢838、测64杂交建立F1、F1与亲本回交群体和F2群体,分析越冬性及主要农艺性状在不同生长季的遗传变异。
短句来源
更多       
  回交
     The cytogenetics of the backcross generations and self-bred progenies (BC2F1, BC3F1, BC2F2,BC3F2 and BC2F3) of intergenetic hybrid of Triticum aestivum L. × Eremopyrum orientale (Ledeb) Jaub.
     对普通小麦(TriticumaestivumL.)与东方旱麦草(Eremopyrumorientale(Ledeb)Jaub.etspach)属间杂种的回交和自交不同世代(BC2F1、BC3F1、BC2F2、BC3F2和BC2F3)进行了细胞遗传学研究。
短句来源
     Seed Set Rate of Backcross of (Chinese Spring ph1b Mutant×Aegilops)F 1 with Chinese Spring ph1b Mutant and Cytology Study of Their BC 1F 1 Plants
     中国春ph1b突变体对(中国春ph1b突变体×山羊草)F_1回交结实率及BC_1F_1细胞学研究
短句来源
     The efficiency of backcross in combination of small/big grain continued from B_1F_1 to B_3F_1;
     回交的效应在小粒×大粒类型的组合中可以从B_1F_1持续到B_3F_1;
短句来源
     A mapping population of 98 backcross inbred lines(BC1F12),derived from a backcross of Nipponbare(japonica)/Kasalath(indica)//Nipponbare by the single seed descent methods,was employed to map quantitative trait loci(QTL)of 4 traits relating to outcrossing in rice by composite interval mapping method.
     利用由98个家系组成的Nipponbare/Kasalath//Nipponbare回交重组自交系(backcross inbred lines,BIL)作图群体(BC1F12),用复合区间作图方法(CIM),对水稻4个异交相关性状进行了QTL分析。
短句来源
     The F1, backcross F1 and F2 population were established from crosses between Glutinou89-1 and Hongmangnuo, Fuhui838, Minghui63, Ce64. Overwintering ability and genetic variation of main agronomic traits were analyzed in different seasons.
     (2)用糯稻89-1与红芒糯、明恢63、辐恢838、测64杂交建立F1、F1与亲本回交群体和F2群体,分析越冬性及主要农艺性状在不同生长季的遗传变异。
短句来源
更多       
  反交
     The experiments of cross and back cross showed that these mutations were belonged to recessive mutation of nucleus gene and controlled by a recessive monogene.
     通过正反交试验表明,大豆叶绿素缺失突变属于核基因隐性突变,而且是由一隐性单基因所控制的。
短句来源
     tulipifera×L. chinense single peak but decreasing rapidly. Family order from high to low rate of net photosynthesis was back cross,L.
     其净光合速率由高至低的排序依次为回交家系、正交家系、反交家系、鹅掌楸、F1个体间杂交家系。
短句来源
     In order to analysis the genetic characteristic of male sterility,test cross,sister cross,back cross,reciprocal cross and self pollination were conducted with these male sterile plants.
     通过正交和反交对不育株的所属类型进行分析 ,结合自交、回交分析其遗传特点。
短句来源
  “backcross”译为未确定词的双语例句
     . Eight inbred line parents,P_1,P_2,their se-ven F_1 hybrids,their seven F_2,and 14 backcross populations,B_1,B_2,were used in the analysis.
     每个组合群体都由 P_1、P_2、F_1、F_2、B_1和 B_2世代组成。
短句来源
     Comparison with backcross population developed through phenotypic selection(PHEBC2),by marker-assisted selection(MASBC2) and by random mating where no selection has been applied(RNDBC2),there was no significant difference between means of phenotypic and marker-assisted selection(16.2%) for protein content and the percentage of plants which have protein content higher than 16.5%,but significantly higher than RNDBC2 population.
     再通过表型选择、分子标记辅助选择(MASBC2)和不加选择(RNDBC2)产生的BC2中,蛋白质含量的平均值和群体中蛋白质含量高于16.5%的植株比例在PHEBC2和MASBC2之间没有显著差异,但均显著高于RNDBC2。
短句来源
     Results:The susceptibility loci for high serum level of IgG anti-chromatin antibodies in B/W F1×NZB backcross mice was tightly linked to IL-10RA gene and derived from NZW strain.
     结果:QTL分析结果表明B/W F1×NZB小鼠抗染色质抗体易感基因与NZW型IL-10RA基因紧密连锁;
短句来源
     In this investigation, the plants of hybid F_2, F_3 and backcross B_1 of two incomplete diallel crosses(6×5 and 4×3)were observed and their male sterility and fertility analysed.
     本试验通过对两组不完全双列杂交(6×5和4×3)组合的F_2、F_3及B_1等群体的育性分离情况的观察和分析,初步认为杂交水稻育性茎因型因组合不同而不尽一致。
短句来源
     villosum chromosomes were detected by GISH in the BC 1 plants from the backcross of ‘CSph1b× D.villosum ’ with CSph1b.
     F1花粉母细胞FISH观察表明 :“CS×H .villosa”F1联会染色体均为小麦染色体 (W W ) ,在“CSph1b×H .villosa”F1中
短句来源
更多       
查询“backcross”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  backcross
The Fate of Backcross Offspring of Apomeiotic Maize × Gamagrass Hybrids
      
Investigation of the Backcross Progeny of Barley-Wheat Hybrids by the RAPD and RAMPO Methods
      
The aneuploid line L-9 (2n = 43 +t) was obtained after a second backcross of the hybridH.
      
Specific Features of the Nuclear Genome Recombination in Backcross Progenies of Barley-Wheat Hybrids Hordeum vulgare L.
      
The backcross progenies of the barley-wheat hybrids Hordeum vulgare L.
      
更多          


This paper deals with the genetic behaviour and breeding practice of the interspecific hybridsbetween G.hirsutum and G.arboreum obtained in 1944 and 1952.The main results are pre-sented as follows:1.The pollen grains of the Asiatic cotton germinate slowly on the stigma of the Uplandcotton.The growth of pollen tubes is slow and their female and male gametes are incom-patible at fertilization.Generally only a few ovules were fertilized within a boll.Owing tothe fact that the production of the nutritive substances...

This paper deals with the genetic behaviour and breeding practice of the interspecific hybridsbetween G.hirsutum and G.arboreum obtained in 1944 and 1952.The main results are pre-sented as follows:1.The pollen grains of the Asiatic cotton germinate slowly on the stigma of the Uplandcotton.The growth of pollen tubes is slow and their female and male gametes are incom-patible at fertilization.Generally only a few ovules were fertilized within a boll.Owing tothe fact that the production of the nutritive substances was inadequate to meet with the re-quirement of the normal development of the boll,it is difficult to obtain hybrids.In orderto promote the boll setting,pollinated maternal pollen grains ware applied on the stigmatawhich had been pollinated with paternal pollen grains several hours before.In this way,wegot the interspecific hybrids. 2.The interspecifie hybrids between these two species are physiologically abnormal.Thehybrids are highly sterile,either by selfing or by back crossing.The pollen grains of theUpland or Asiatic cotton may germinate on the stigma of the F_1 hybrids and the growing rateof their pollen tubes is also normal.Abnormality of the ovules may be the main cause forabortion.Most of the hybrid ovules have no embryo sacs.Occasionally a few ovules fertilized,but aborted during the development of embryoes.The chromosome number of the pollen mothercells of the F_1 hybrid,in general,is 39,or occasionally 52.The chromosome behaviour isirregular in meiosis,forming not only quartets,but also micronuclei.The percentage ofapparently well developed pollen grains is only 7.1% most of which are inviable too.The back-crosses either with the Upland or the Asiatic cotton as recurrent parent with F_1 hybrids aspollen parents are also with difficulty,because their pollen grains are highly abortive.3.The suitable concentration of sucrose in agar medium for artificial germination ofcotton pollen grains varies with cotton species:G.arboreum,34-35%,the Upland cotton,37-40%,and the Sea Island cotton,37-39%.4.By treating the mixed solution of 38% sucrose and a small amount of vitamin B1 onthe stigma of the F1 hybrid,the fertilization and development of the ovules may be promoted.The formation of the abcission layer of the stalk may be inhibited by the treatment of 5 p.p.m.2, 4-D linolin paste.By using the forementioned treatments,the fruiting percentage of theF_1 hybrids backcrossed with the Upland cotton rise up to 4.19%,even though there is only afew bolls with one mature seed,quite a number of them are seedless.Alternatively,by meansof repeated pollination,the fruiting percentage was 0.19%,and seeds are obtained.By usingG.arboreum L.as recurrent parent in backcrosses with the F_1 hybrids,the fruiting percentagerises up to 9.16%,but no seed has ever been obtained.5.For the purpose of improving the lint length and Ginning percentage,it is importantto choose the recurrent parent in the backcross with the F_1 hybrid.It may be ineffective forincreasing the number of backcrosses.6.The range of segregation of the lint length and ginning percentage of the backcrossprogeny,is wider in using F_1 hybrids as female parent than as males.Thus,it should beconcerned for selection of higher lint length and gining percentage.7.In the progeny of the interspecific hybrid of 1944 Combination,individual plants withgood economic characters were observed,such as lint length 41.3 mm.,ginning percentage 41.9%,hairiness,disease resistant,and early maturity,etc.By applying repeated selection of in-dividual plant,four desirable new strains were obtained:“Long Fibre No. 2,”“NankingCotton No.25,”“1003-7,”and “5161-2.”The characteristics of the “Long Fibre No.2”areearly maturity,long lint,single boll weight 5.28g.,fibre length 36 mm.,ginning percentage 31%,lint index 5.22g.,seed index 11.48g..The corresponding characters of the other varieties are:“Nanking Cotton No.25”:5.54g.,30-32 mm.,37-39%, 6.51g.,10.04g;“1003-7”:5.8g.,31,5mm.,38.6-39.18%,6.56g.,10.48g.;“5161-2”:5.20g.,30.31 mm.,39-39.7%,6.80g.,10.76g,respectively.

1.对陆地棉与中棉的杂种第一代和克服杂种第一代的不孕性进行研究,初步找出了不孕的原因和克服办法,为创造种间杂种,丰富育种材料,提供了可能。2.种间杂种遗传基础复杂,与具有优良性状多的陆地棉品种回交,获得许多超越亲本性状的新类型,可以选育出丰产、优质、抗病性强等的新品系。3.杂种第一代花粉母细胞染色体数,在同一花蕾上就有所不同,说明受精卵细胞在分裂的过程中已不正常,每一细胞的染色体数也不尽相同。

According to investigations, some characteristics of male-sterile type in maize have been described and discussed in the present paper. The main results obtained are summarized as follows:In the backcross method for maize, the original male-sterile type may be transformed into a new male-sterile line. As the number of backcross generation increased, the green leaf area of the strain gradually decreased. Although the male-sterile line had been crossed through 4-5 generations, its green leaf area and...

According to investigations, some characteristics of male-sterile type in maize have been described and discussed in the present paper. The main results obtained are summarized as follows:In the backcross method for maize, the original male-sterile type may be transformed into a new male-sterile line. As the number of backcross generation increased, the green leaf area of the strain gradually decreased. Although the male-sterile line had been crossed through 4-5 generations, its green leaf area and the power of photosynthesis were still higher than in the case with the fertile line. Consequently, the productivity of the single male-sterile line through 3-4 generations was greater than that of the corresponding combinations of single fertile hybrids both in the green leaf area and the power of photosynthesis. The net rate of assimilation and the yields of sterile line were also higher. It has been found that single hybrids from early male-sterile line had a greater heterosis than the corresponding combinations of single hybrids.After testing the inbreds crossed with a male-sterile line, a few stronger restorers were be found. It was suggested that the inbreds Wei-shi 137, Wei-er44, W153 and Wa8 would highly restoring ability for T-type male-sterile line.

研究结果表明,将原有的玉米雄性不育系转化为新的不育系,回交4—5代,新不育系绿叶面积、光合势略高于保持系,植株外貌极为相似,可供育种工作利用。在净同化率和产量方面,同组合的不育单交种较可育单交种为高。同时,通过对不育系育性的鉴定,初步认为威西137、维尔44、威153和瓦8等4个自交系具有较高的恢复能力。

The interspecific F1 hybrid was obtained from a cross between Upland cultivar DPL 14 (Gossypium hirsutum L.), as female, and Asiatic cultivar Changzi No. 1 (Gossypium arboreum L.), as male parents. The recurrent parents DPL and Ning-cotton No. 13, both Upland cultivars, were thereafter backcrossed with the F1 hybrid for several generations. By adopting the method of single plant selection the new variety, Kiangsu Cotton No. 1, was bred out in 1970.During 1971-1974, the multilocation tests of this new variety...

The interspecific F1 hybrid was obtained from a cross between Upland cultivar DPL 14 (Gossypium hirsutum L.), as female, and Asiatic cultivar Changzi No. 1 (Gossypium arboreum L.), as male parents. The recurrent parents DPL and Ning-cotton No. 13, both Upland cultivars, were thereafter backcrossed with the F1 hybrid for several generations. By adopting the method of single plant selection the new variety, Kiangsu Cotton No. 1, was bred out in 1970.During 1971-1974, the multilocation tests of this new variety were carried out at Chitung, Taichang, Suining, Dafeng and other counties of Kiangsu province. The results showed that the lint yield was 10-15% higher than the stockseed of the commercial varisty DPL 15. The record yield obtained in an intensive cultivat ed field of 3.15 mu was 322.4 jin/mu in 1974. Its fibre quality was better than DPL 15: with silky clean lint, main length 32.7mm., single fibre strength 4.4 g., breakage length 25.18 km., maturity 77.5%, yarn strength good, quality index 2,401. The acreage devoted to Kiangsu Cotton No. 1 has been extended to around 130,000 mu in 1975.The incompatibility of interspecific hybridization between Upland and Asiatic cottons and the infertility of their F1 hybrid were investigated. The ways for overcoming these hindrances have been worked out preliminarily, so that the percentage of retention of hybrid bolls is increased as a result.By means of recurrent backcrossing of the interspecific hybrid with the recurrent parents, Upland cotton, and selecting for the desirable characteristics of both parents, not only the favorable characters of Asiatic cotton can be transferred into the genetic background of Upland cotton and be stabilized in situ, but also transgres-sive characters can be obtained in the progenies of the backcross generations. For instance, the early maturity and boll openning characters of the new variety tend towards Asiatic cotton, and growth potentiality, high yielding ability and high lint percentage tend towards Upland cotton; while lint colour, fibre length and strength are even better than both parents. Some variants of Kiangsu Cotton No. 1 possess combination of desirable characteristics of large boll, single boll weight more than 8 g., high boll retention ability, early maturity and wide boll openning. It seems to indicate that the contradiction between these characteristics could be overcome.

1.从1952年开始,以陆地棉(Gossypium hirsutum L.)岱字棉14号为母本,中棉(Gossypium arboreum L.)常紫1号为父本,进行种间杂交,得到杂种第一代。其后又与岱字棉及宁棉13号进行多次回交和杂交,采用连续单株选择法,于1970年育成江苏棉一号。 2.1971—1974年,江苏棉一号在江苏省的启东、太仓、睢宁、大丰等县进行多点试验,一般比岱字棉15号原种增产10—15%。小面积丰产田创造了亩产皮棉322.4斤的高产记录。江苏棉一号纤维品质优于岱字棉15号,絮色洁白,有光泽,主体长度32.7毫米,单纤维强力4.4克,断裂长度25.18千米,成熟度77.5%,成纱强力好,品质指标2,401。江苏棉一号1975年种植面积达13万亩左右。 3.对陆地棉与中棉种间杂交的不亲和性和杂种一代的不实性问题进行了研究,初步找到了克服的途径,提高了结铃率。 4.陆地棉与中棉种间杂交,再与陆地棉多次回交,并对后代进行选择,不仅可以把中棉的某些优良性状在陆地棉的遗传背景上稳定下来,同时还可以获得超亲本的性状。江苏棉一号的早熟性和裂铃吐絮等特性趋向于中棉,生长势、丰产性、高衣分等性状趋向于陆地棉...

1.从1952年开始,以陆地棉(Gossypium hirsutum L.)岱字棉14号为母本,中棉(Gossypium arboreum L.)常紫1号为父本,进行种间杂交,得到杂种第一代。其后又与岱字棉及宁棉13号进行多次回交和杂交,采用连续单株选择法,于1970年育成江苏棉一号。 2.1971—1974年,江苏棉一号在江苏省的启东、太仓、睢宁、大丰等县进行多点试验,一般比岱字棉15号原种增产10—15%。小面积丰产田创造了亩产皮棉322.4斤的高产记录。江苏棉一号纤维品质优于岱字棉15号,絮色洁白,有光泽,主体长度32.7毫米,单纤维强力4.4克,断裂长度25.18千米,成熟度77.5%,成纱强力好,品质指标2,401。江苏棉一号1975年种植面积达13万亩左右。 3.对陆地棉与中棉种间杂交的不亲和性和杂种一代的不实性问题进行了研究,初步找到了克服的途径,提高了结铃率。 4.陆地棉与中棉种间杂交,再与陆地棉多次回交,并对后代进行选择,不仅可以把中棉的某些优良性状在陆地棉的遗传背景上稳定下来,同时还可以获得超亲本的性状。江苏棉一号的早熟性和裂铃吐絮等特性趋向于中棉,生长势、丰产性、高衣分等性状趋向于陆地棉,而纤维色泽、长度、强度等则是超亲本的。江苏棉一号中出现的大铃类型,铃重在8克以上,同时结铃性强、早熟、吐絮畅,这说明了大铃与结铃性、早熟性等的?

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关backcross的内容
在知识搜索中查有关backcross的内容
在数字搜索中查有关backcross的内容
在概念知识元中查有关backcross的内容
在学术趋势中查有关backcross的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社