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progenies
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  后代
     In the nullisomic lines 1B,1D, 2A, 2D, 4B, 4D, 5A, 6A, 6B, 6D, 7A, and 7B, there were more than 90% cells with 2n = 20", 1.65-10.00% cells with 2n = 19" + 2' at the metaphase I of PMCs, and the frequencies of the nullisomics in the selfing progenies were more than 96%.
     在减数分裂中,1B、1D、2A、2D、4B、4D、5A、6A、6B、6D、7A和7B缺体有90%以上的细胞为2n=20",1.65—10.00%的细胞为2n=19"+2',自交后代96%以上为缺体;
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     the progenies of CP 65/357 and CP 72/1312 also perform well.
     另 CP 65/357、72/1312等的后代也均有良好表现。
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     Biological Characteristics of Asexual Progenies of Phytophthora infestans Stains DK98-1 and HD01-3
     马铃薯晚疫病菌DK98-1和HD01-3无性后代生物学特性的研究
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     (3)The difference on the main traits between anther-cultured and conventional progenies were statistically analyzed,among which the fertility of anther-cultured progenies improved significantly. In the meanwhile,the fertility of B_1F_1H_2 was higher than that of F_2H_2 in the same cross.
     (3)统计分析了花培与常规后代各主要性状的差异,其中B_1F_1H_2较B_1F_2、F_2H_2较F_3结实率均显著提高,且同一组合的B_1F_1H_2较F_2H_2结实率高。
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     (4) The result of hybrid identification by morphological characters express that, except 29-2, 29-3, 29-4, 12-3, 56-1 and 37-1, all progenies are hybrids.
     (4)据外部性状对真杂种的初步鉴定结果表明,51个后代中除29—2、29—3、29—4、12—3、56—1这5个后代可能为自交种,37—1不能鉴定外,其余的后代均可能是杂交种。
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  后代的
     The Performance of selected progenies of two new parental combinations (CPT2-1210 × Yacheng 73-512 and CP72-1210 × Huanan58-12) were studied.
     研究了CP72/1210×崖城73/512和CP72/1210×华南66/12两个新亲本组合入选后代的表现。
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     RESULTS: After different doses of irradiation, SF2 of Hep-2 cells was 0.47-0.64; TRF was 3.76-9.43 kb; TA was 1.761-2.606. Each parameter had significant differences among the survival progenies (P<0.05).
     结果:人喉鳞癌细胞不同放射剂量存活后代的SF2:0.47~0.64,TRF:3.76~9.43kb,TA:2.606~1.761,且它们各自的SF2、TRF、TA存在差异(P均<0.05);
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     Chromosomal and genomic compositions of progenies from Brasscia napus hypoploid(2n=30)
     甘蓝型油菜亚倍体(2n=30)后代的染色体及基因组组成分析
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     The conventional cytological observations were carried out on selfed progenies(2n=30~36) of Brassica napus hypoploid(2n=30) and the hypoploid × B.rapa hybrids(2n=22,24~28,31).
     甘蓝型油菜亚倍体(2n=30)与白菜杂交后代的染色体数目为2n=22、24~28、31,自交后代的染色体数目为2n=30~36。
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     Transformation of Anti-TrxS Gene by Microprojectile Bombardment and Genetic Analysis of the Transgenic Wheat Progenies
     基因枪转化Anti-Trxs基因与转基因小麦后代的遗传分析
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     Five molecular makers R14,JJ113,JJ6782,JJ6242 and G103 linking with Pi-3,the blast resistance gene,with a distance of 1.7 cM,5.4 cM,16.2 cM,21.7 cM and 6.9 cM on rice Chromosome 9 were found by using both parents C104PKT and A57,and their F2 progenies with CO39 background in this study.
     利用CO39近等基因系中的C104PKT和A57-119及其杂交F2代为材料,在水稻第9染色体上找到了5个与Pi-3基因紧密连锁的分子标记R14,JJ113,JJ6782,JJ6242和G103,它们与Pi-3间的遗传距离分别为1.7cM,5.4 cM,16.2 cM,21.7 cM和6.9cM。
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     Preparation And Progenies of YBa_2 Cu_4O_8 Superconducting Materials With Ca-Supstitution And Ag_2 O-Addition
     Ca替代和Ag_2O添加的YBa_2Cu_4O_8超导材料的制备与超导电性
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     The annual effective doses from 222Rn and 220Rn progenies are 1.62 and 0.61mSv, respectively.
     222Rn、220Rn及其子体所致居民年有效剂量分别为1.62和0.61mSv。
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     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
     Establishment of Wheat-Agropyron cristatum Alien Addition Lines I Cytology of F3,F2BC1,BC4, and BC3F1 Progenies
     小麦-冰草异源附加系的创建 IF_3、F_2BC_1、BC_4和BC_3F_1世代的细胞学
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  progenies
Variation analysis and fine family selection on half-sib progenies from clonal seed orchard of Pinus massoniana
      
Variation of traits that include height, diameter at breast height (DBH), stem volume, crown width, straightness, wood basic density, tracheid length and width of open-pollinated progenies from clonal seed orchard of Pinus massoniana was analyzed.
      
The RP transgene can be steadily inherited to, and expressed at RNA level, the progenies.
      
Diploid gynogenetic progenies were obtained in the stellate sturgeon Acipenser stellatus, Russian sturgeon, A.
      
The results of comparative crosses of crucian carps with different ploidy suggest a high fertilizing capacity of triploid males, as well as normal viability of their progenies.
      
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1.In order to produce a new disease-resistant and high-yielding variety of kenaf adaptedto the cultivating conditions of North China,the authors carried out several crossesbetween the varieties of early maturing northern type and those of the disease resistantsouthern type since 1955.Two superior strains,4-83 and 176-10,were selected from F_5of Madres (♀) ×Huanung No.1 and F_6 of Sullen 21(♀)×Madres.Both strains were ap-peared to be resistant of anthracnose of kenaf,caused by colletotrichum polacci,and with...

1.In order to produce a new disease-resistant and high-yielding variety of kenaf adaptedto the cultivating conditions of North China,the authors carried out several crossesbetween the varieties of early maturing northern type and those of the disease resistantsouthern type since 1955.Two superior strains,4-83 and 176-10,were selected from F_5of Madres (♀) ×Huanung No.1 and F_6 of Sullen 21(♀)×Madres.Both strains were ap-peared to be resistant of anthracnose of kenaf,caused by colletotrichum polacci,and with highfiber yield.The time of full blossom for these two strains in Peking district were in the middlepart of August.and at the end of July respectively,and both strains can be adapted to thelocal conditions for regular growth.2.From crosses between kenaf varieties,the resulting generations of F_1 and F_2 showedhybrid vigour in plant size.By means of directed selection,the desirable progenies maintainedtheir plant height,superior to the parents.3.The F_1 plants which derived from the crosses between the varieties of disease-resistanttype and those of susceptible type showed susceptibility to anthracnose.In F_2 and succeedinggenerations,both healthy and susceptible plants were segregated in a rate varied with strains.According to observation,it was found that the phenomenon of disease escape still occurredamong strains and among individuals within strains.Hence it was recognized that the testsfor disease resistance of the desirable strains must be conducted for 3-4 years.4.The selection of parental plants showed a great effect on the variation of charactersin the offspring,especially on the time of maturity.Under the natural conditions of Pekingdistrict,when the selected parents were both able to flower,the flowering plants in F_2 werefound to be in a greater percentage and began to bloom in an earlier stage.While in thecondition of either one of the selected parents was unable to flower,a lower percentage offlowering plants appeared in F_2 and the time of beginning to flower was delayed.If bothselected parents were in a state of very late maturing or even unable to flower,then,very few or not a single plant in F_2 was able to flower.Same tendency was observed in F_3and in the descending generations.In order to obtain a good proportion of flowering plants,the number of seeds sowing in various generations should be based upon the time of maturityof their parents.

从马德拉斯红茎(♀)×华农一号及苏联21(♀)×马德拉斯红茎的第五、六代中,分别选出抗炭疽病的优良洋麻新品系4—38及176—10,并进行了杂交后代成熟期、植株高度及抗病性等主要经济性状的变异观察。

An analysis of the components of variations and the estimation of four genetic para-meters,namely heritability,genetic correlation,genetic advance and selection index,in F_2population and F_3 progenies of six crosses between varieties of different ecolog cal type ofkeng rice,were made at the Institute Farm,Peking in 1962-1963.1.The heritabilities of important economic characters of rice as estimated from 4 differentmethods (heritability in the broad sense,regression of offsprings on parents,correlation...

An analysis of the components of variations and the estimation of four genetic para-meters,namely heritability,genetic correlation,genetic advance and selection index,in F_2population and F_3 progenies of six crosses between varieties of different ecolog cal type ofkeng rice,were made at the Institute Farm,Peking in 1962-1963.1.The heritabilities of important economic characters of rice as estimated from 4 differentmethods (heritability in the broad sense,regression of offsprings on parents,correlation be-tween them and variance analysis) showed a uniform tendency with the exception of grainsper ear and 200-grain weight.The heritability of heading days was the highest,those ofplant height and ear length ranked next,while those of sterility,ears per plant and ear weightper plant were among the lowest.2.Phenotypic,genotypic and environmental correlations among characters were calculated.In all instances,genotypic correlations were higher than the corresponding phenotypic corréla-tions,and both were of the same direction.The degrees of correlation between charactersvaried with different crosses.Thus,in Kwang-Fu No.1 & Foji-Saka No.5,correlations be-tween yield (ear weight per plant) and other characters were comparatively low;while with853 & Norin No.20,there were high geotypic correlations between yield on the one hand andheading days,plant height,ear length on the other hand.3.By selecting the 5% top or bottom performing F_3 progenies,the expected genetic pro-gress and its relative efficiency for plant height were the heighest in the cross Bih-Chieh 800granis & Norin No.20,being 17.88 cm.and -14.7% respectively;those of sterility were thehighest in Shui-Yuan 300 grain & Ping-Shah native variety,being -6.81 and -33.82% respec-tively.In the cross of 853 & Norin No.20,both genetic advance and its relative efficiencywere high for heading days,200-grain weight and yield (ear weight per plant).4.Selection of one character in hybrid population would simultaneously affect the geneticprogress of other characters.For example,through a 5% selection toward shortness for plantheight in Kwang-Fu No.1 & Foji-Soka No.5,the selected progenies showed earlier in ma-turity,had less grains per ear.5.A number of selection indexes were formulated.Using data on yield components;i.e.grains per ear,200-grain weight and ears per plant,the reliability of the expected geneticprogress in yield was 42% higher than that from straight selection for ear weight per plant.If the index was worked out on the basis of grains per ear and 200-grain weight,the relativeefficiency was 14% higher than on yield alone.Selection scores calculated from the most effec-tive selection index was used to evaluate the relative performance of superior progenies insome crosses.6.Experimental results revealed that the four genetic parameters mentioned above,wereeffective means for increasing the effectiveness of selection in the breeding programme of rice.

水稻性状遗传力的位次,在不同估算方法(广义法、迴归及相关法、变量分析法)间,除一穗粒数、粒重有出入外,其它几个性状都有一致的趋势,即抽穗日数最高,株高、穗长次之,空壳率、穗数及穗重最低。性状间的相关程度因组合而异,遗传相关一般高于表现型相关,两者的正负方向大体相同。性状遗传进度的大小决定于遗传力及遗传变异幅度,在5%选择强度下,性状的遗传进度,组合间有显著的差异。性状遗传进度间的相关表明,向矮稈选择时,后代会引起早熟、一穗粒数减少等现象。选择指数的效果因其构成而不同,应用具有较高效率的选择指数,分别算出各系统的综合评价点数,以判断系统的丰产价值。

Four different types of cytoplasmic male sterility in maize were tested for their identityby use of the restoration technique.Male-sterile lines incorporated with cytoplasm of theTexas source were found to be completely affected in crosses by a group of restorers includ-ing W153,W28 and G32,and partially restored by W24,M14 and A34.This made a figure of6 restorers out of about 60 inbreds thus tested in the Texas cytoplasm.Inbreds W153 wasselected as a differential restorer for T-type steriles since it gave no...

Four different types of cytoplasmic male sterility in maize were tested for their identityby use of the restoration technique.Male-sterile lines incorporated with cytoplasm of theTexas source were found to be completely affected in crosses by a group of restorers includ-ing W153,W28 and G32,and partially restored by W24,M14 and A34.This made a figure of6 restorers out of about 60 inbreds thus tested in the Texas cytoplasm.Inbreds W153 wasselected as a differential restorer for T-type steriles since it gave no reactions to the othertypes.For the Moldavia type of male sterility,formerly offered by Prof.Hadjinov,we founda partially restoring inbred W9 to be better suited for the similar purpose.The third andfourth type of male sterility,designated as B- and G-type,came through our own selectionsfrom two Bulgarian varieties.Separation between them seemed difficult.Since A374 gavepartial pollen fertility to the B-type steriles exclusively,it could be used as a differentiat orfor this type of cytoplasm.Pollen restoration in crosses involving W153 and W28 followed the expectation based ona dominant Mendelian gene.However,data obtained from segregating progenies of doublecrosses in which G32 was the restorer suggested strongly that two dominant complementarygenes were more workable.The difference in genotype of inbreds concerned in variousinvestigations seemed to be responsible for such inconsistent results.Segregating patterns in the Texas sterile crosses of the partial restorer,W24 or M14,varied with plants used as the pollen parent and with the date of planting.It appeared verylikely that W24 and M14 were heterozygous for major restorer genes since one sterile versionof W24 and four fully restoring lines of M14 had been established by conversion and test-cross-ing respectively.Dominant modifiers might also be present in either of the inbred popula-tions.In the presence of Moldavian cytoplasm the recessive allele of the restorer gene seemedto exert an abortive action to its pollen carriers produced by the heterozygote.When plantsheterozygous for the restorer gone were outcrossed to male steriles carrying the right cyto-plasm,all plants from the progenies proved to be pollen shedders.It was suggested that theM-type cytoplasm might be similar to that of S-type.Tentative genotypes related to pollen restoration of Texas male sterility had been workedout for a number of inbreds on the basis of two dominant complementary genes.Workingschemes for the production of double-cross seeds of maize without detasseling had been sum-marized and discussed by the authers.

三种细胞质遗传的玉米雄花不孕类型各有其专效的恢复系和部分恢复系。在 T 型细胞质基础上,测定出两对显性互补基因决定着花粉孕育性的恢复,同时还有显性修饰基因存在,影响其表现的程度。春播和夏播的不同环境条件只对部分恢复性的表现发生明显影响,对全恢复性和不孕性则很少能够改变。M 型恢复性的等位隐性基因在杂合株内对花粉粒具有某种致死或败育作用,故测交后代表现不分离现象。本文初步鉴定了若干常用自交系的 T 型恢复基因型,并以此作为根据,提出了配制全不去雄的玉米双交种的各种可能方案。

 
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