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chromosome numbers
相关语句
  染色体数目
     7 types of chromosome numbers (2n=72,80,84,88,92,96,102).
     染色体数目有2n=72,80,84,88,92,96,102等7种类型。
短句来源
     In BC_1F_2 and BC_1F_3, the somatic chromosome numbers were 45 to 53 and 44 to 52 respectively, the rates of 49 chromosome type were 30.19% and 27.50%, the percentages of alien chromosome transmitting were 11.85% and 13.14%.
     BC1F2和BC1F3体细胞染色体数目范围分别为45~53和44~52,49条染色体的植株类型分别占30.19%和27.50%,华山新麦草染色体丢失率分别为11.85%和13.14%;
短句来源
     The results show that the chromosome numbers are 2n=2x=28; the fomula of karyotypes K(2n)=2x=28=6sm(2SAT)+22m;
     结果显示 :冰河雪兔子 (Saussureaglacialis)染色体数目 2n =2 8,核型公式K( 2n) =2x=2 8=6sm( 2SAT) + 2 2m ;
短句来源
     Somatic chromosome numbers of cultivars 'Qijianheimo'and 'Qijianbaimo'are 2n=40 (diploid), the karyotype formulas being 2n=2x=40=30m+10sm and 2n=2x=40=2M+36m+2st, respectively.
     结果表明,企剑黑墨和企剑白墨的染色体数目为2n=40,为二倍体,核型公式分别为:2n=2x=40=30m+10sm和2n=2x=40=2M+36m+2st;
短句来源
     huashanica (2n=14,NN) were studied. The results showed that the somatic chromosome numbers were 42 to 44 from H20 and 40 to 42 from H1,and the cells rates of 2n=44 and 2n=42 were \{58.33%\} and 90% respectively.
     结果表明,H20和H1的体细胞染色体数目范围分别为42~44和40~42,2n=44和2n=42的细胞频率分别为58.33%和90%;
短句来源
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  染色体数
     The somatic chromosome numbers of the second generation (C2) ranged from 24 to 33,among which the 2n=28 individuals constitute 42.85% the total plants that were investigated. Their average chromosome pairing at MI was 4.53I+6.11RingII+5.58RodII+0.032III, and their average seed setting percentage was 24.54%.
     其自交后代C2的染色体数变化范围为24-33,其中2n=28的个体占调查总数的42.85%,它们的PMC MI 平均构型为4.53I+6.11RingII+5.58RodII+0.032III,平均结实率为24.54%。
短句来源
     kamoji (♀) with CS, which showed two types of root tip somatic chromosome number with either expected 2n-42 or unexpected 2n=63, the other combinations all showed expected chromosome numbers, i.e., 2n=35 and 2n=42 for (R.ciliaris×CS) F_1 and (CS×R.kamoji) F_1 respectively.
     根尖细胞染色体计数表明前两个组合F_1均具有预期的染色体数(分别为2n=35和2n=42)、而在鹅观草(♀)×中国春(♂)F_1中,除2n=42的预期类型外,还发现育2n=53异常类型。 预期类型F_1形态均呈中间型,2n=63异常类型偏向于中国春。
短句来源
     The chromosome numbers of five species of precious rare and endangered plants are reported as follows: 1. Amygdalus mongolia (Maxim) Yu 2n=16;
     本文对5种珍稀植物做了染色体观察,其结果为:蒙古扁桃染色体数为2n=16;
短句来源
     They are triploid (2n=3xr=36),diploid (2n=2x=24) and aneuploids (9,18,etc.) . The chromosome numbers of 15 endosperm plantlets were examined,in which the ratio of the triploid plants is 73.3%.
     其中有三倍体(2n=3x=36),也有二倍体(2n=2x=24)和非整倍体的细胞,染色体数为9、18等,但从观察的15株胚乳苗来看,三倍体有11株,占73.3%,非三倍体的只有4株,占26.7%。
短句来源
     2.The analysis of karyotype of "Fuzhou 60 day" showed that: the somatic chromosome numbers were 2n=18, the chromosome with satellite was located in chromosome 7 with a arm ratio 2.01. The length of the chromosomes was between 2.05 and 3.9Q\im, the relative length was between 7.97% and 15.17%.
     2.分析了“福州60天”花椰菜的核型,结果表明:花椰菜体细胞染色体数2n=18,染色体绝对长度为2.05~3.90μm,第7对染色体为随体染色体,其臂比值为2.01;
短句来源
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  染色体数目的
     This paper reports the chromosome numbers of 10 species of Compositae and the karyotypes of 8 of them They are: Callistephus chinensis 2n=18=18m(4SAT);
     作者对10种菊科花卉进行了染色体数目的观察,并对其中8种进行了核型分析。 结果如下:翠菊(Callistephus chinensis Nees) 2n=18=18m (4SAT);
短句来源
     The present paper reports chromosome numbers of 13 modern rose cultivars, and karyotypes of 12 cultivars among them. They are: 'Super Star' 2n = 4x = 28 = 24m+ 4sm,lA type;
     作者通过对13个现代月季品种的染色体数目的观察和12个品种的核型分析,得到以下结果:‘明星’(‘Super Star’)2n=4X=28=24m+4sm,核型为1A型;
短句来源
     The chromosome numbers in tetrageneric hybrids varied from 36,37,38,39,40 and 41 most of the plants had 38 chromosomes.
     四属杂种体细胞染色体数目的变化为36、37、38、39、40和41。 其中多数属于具有38个左右染色体的植株。
短句来源
     STUDY ON CHROMOSOME NUMBERS OF 6 SPECIES AND 1 VARIETY IN ACTINIDIA LINDL
     6种1变种猕猴桃植物染色体数目的研究
短句来源
     The results were based on the information on chromosome numbers of 62 species and on karyotypes of 54 species in 10 sections,52% and 45% of total species respectively.
     在山茶属14组119种植物中有10组62种已具染色体数目的报道,54种已知核型,分别占总数的52%和45%。
短句来源
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  “chromosome numbers”译为未确定词的双语例句
     The chromosome numbers of 2 A10 and 9B5 were 60 ±5, 72±6 respectively.
     亚类测定分别为IgM、IgG2_a、IgG2_4、染色体记数2A10为60±5,9B5为72±6。
短句来源
     Chromosome numbers and karyotypes in some oil plants are reported as follows:Carthamus tinctorins, 2n=24=20m (2SAT)+4 sm (2 SAT):Helianthus annuus, 2n=34=l6m+8sm (4SAT)+10st(2SAT);
     四种油料植物的核型分析结果如下:红花,2n=24=20m(2SAT)+4sm(2SAT); 向日葵,2n=34=16m+8sm(4SAT)+10st(2SAT);
短句来源
     maximauj-iczii 2n = 16 = 2m +6sm +8st. The chromosome numbers and karyotypes of A.
     caeruleum为2n=16=2m+6sm+8st;
短句来源
     The karyotype 2n=22=2m+4sm+8st+8t of Lysimachia hemsleyana Maxim,the karyotype 2n=24=2m+2sm+10st+10t of L. congestiflora Hesms,and the chromosome numbers 2n=22,and the karyotype 2n=22=4m+6sm+4st+8t of L. melampyroides R.
     染色体核型 2n =2 2 =2m +4sm +8st+8t,聚花过路黄 (L .congestifloraHesmsl.)
短句来源
     2. Viable aneuploid chromosome numbers included 2n+1,2n+2,2n+3,3n-2 and 3n-1.Oysters with 2n+2 and 2n+3 chromosome were found at the first time.
     2、本研究共发现 2n+1、2n+2、2n+3、3n-2 和 3n-1 五种类型的长牡蛎非整倍体,其中 2n+2 和 2n+3 两种类型为首次报道。
短句来源
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  chromosome numbers
Changed chromosome numbers (mixoploidy and aneuploidy) as well as chromosomal aberrations were recorded.
      
Cytogenetic analysis has shown significant intra- and interclonal variability in chromosome numbers and ratios of the parental chromosomes in the hybrid cells: six clones contained all M.
      
Published data on chromosome numbers of Salmonoidei are summarized.
      
Wheat alloploid forms (tetra- and hexaploids with the chromosome numbers of 28 and 42) exceeded the diploid forms (the chromosome number of 14) 2.3-2.4-fold by their absolute growth rate (AGR).
      
The cytogenetic analysis demonstrated that this protocol did not affect the chromosome numbers in the regenerated plants.
      
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There are two subspecies of migratory locusts in China. One is Locusta migratoria manilensis Meyen, distributing in the east and south-east area, and the other Locusta migratoria migratoria L. in north-west area. The basic chromosome numbers of these two subspecies are all 2n=22+X in male. They both have individuals with supernumerary chromosomes. The behavior of these chromosomes in spermatogenesis has been described.We obtained several hybrid individuals from a cross, Locusta migratoria migratoria...

There are two subspecies of migratory locusts in China. One is Locusta migratoria manilensis Meyen, distributing in the east and south-east area, and the other Locusta migratoria migratoria L. in north-west area. The basic chromosome numbers of these two subspecies are all 2n=22+X in male. They both have individuals with supernumerary chromosomes. The behavior of these chromosomes in spermatogenesis has been described.We obtained several hybrid individuals from a cross, Locusta migratoria migratoria L.♀×Locusta migratoria manilensis Meyen. The hybrid meiosis has been studied in detail. It is found that it is quite normal with exception of forming occasionally chromatin bridges in anaphase ⅠandⅡ. Several male hybrids, which have been studied cytologically, possess supernumerary chromosomes in addition to normal chromosome complement. These individuals are apparently resulted from an union of gametes with supernumerary chromosomes. The behavior of these supernumerary chromosomes in hybrids during meiosis is similar to that of their parents.In the hybrid, chromatin bridges accompanied with fragments formed by one of the large bivalents have been found in first and second meiotic divisions. These suggest that there is an inversion in one of the large homologous chromosomes of the parental individuals.The isolation mechanism in these two subspecies has been discussed. And we suggest that geographical isolation is one of the most important factors.

我国的飞蝗在分类学上分为两个亚种,即Locusta migratoria manilensis Meyen和L.m.migratoria L.。这两个亚种的染色体基数均为2n=22+X((?))。在这两个亚种的许多个体中常有超数染色体存在。这些超数染色体在成熟分裂过程中的行为已加以描述。 两个飞蝗亚种的杂种可以在实验室条件下获得。杂种精巢的成熟分裂曾进行观察分析,其分裂过程大多正常进行。杂种个体亦含有超数染色体,这是由于含有超数染色体的配子结合的结果,所以证明至少一部分含有超数染色体的配子是有机能的。杂种的超数染色体在成熟分裂時的行为与亲本的相似。 根据我们所观察的几个杂种个体的成熟分裂,在杂种的染色体结构差別中可能有一逆位区存在。由于逆位双价体发生交換,可以在后期Ⅰ看到形成染色质桥和断片或断片,在后期Ⅱ形成染色质桥等图象。 认为这两个亚种隔离机制中起主要作用的因子之一可能是地理隔离。

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。

The F_1 hybrid plant between Oryza sativa L.and Pennisetum sp.was obtained by Teng Yen Tang in 1958.In many morphological characters the hybrid appears to be superior to the parental plants,such as the culms are taller,the leaves are comparatively longer and broader,and the spikes are apparently much larger.However,the form of the spikes of the hybrid plant is spreading type which resembles that of the mother plant. In general,the hybrid plant bears a close resemblance to the female parent,though its spikelets...

The F_1 hybrid plant between Oryza sativa L.and Pennisetum sp.was obtained by Teng Yen Tang in 1958.In many morphological characters the hybrid appears to be superior to the parental plants,such as the culms are taller,the leaves are comparatively longer and broader,and the spikes are apparently much larger.However,the form of the spikes of the hybrid plant is spreading type which resembles that of the mother plant. In general,the hybrid plant bears a close resemblance to the female parent,though its spikelets produce conspicuous long awns which must be inherited from the pollen plant. The F_1 hybrid is almost completely sterile,for it only occasionally produces one or two grains in open condition.Owing to the high regenerating feature,the hybrid plant has been successfully cultivated by vegetative propagation. In a majority of cases,megaspores have been observed to degenerate in rather early stages.More than half of the ovaries examined thus lack embryo-sac formation,they seem to grow parthenocarpically to some extent before degeneration sets in.Embryo- sacs have also been observed to degenerate sooner or later after their formation.In a well formed embryo-sac,when it does occur,the normal three successive mitoses of the nucleus of the embryo-sac mother cell do not occur regularly,and the matured embryo- sac which results,lacks some of its apparatuses.In some cases,the apparatuses differen- tiate in abnormal way.The number of the polar nuclei may be more than two,that of the antipodals is,sometimes,less than three,and the egg apparatus may be composed of four cells instead of three.It is apparently that the apparatuses of the embryo-sac produced in such abnormal manner are functionless.In other cases,the sac loculus of an enlarged ovary has been found to contain nothing but liquid.Only in very rare cases,the for- mation of the embryo-sac and the differentiation of the apparatuses have been carried through in the proper manner. The chromosome number of Oryza sativa L.is n=12 and that of Pennisetum sp. is n=9.Both the somatic and the gametic chromosome numbers of the F_1 hybrid are variable and they generally do not correspond to the sum of the reduced chromosome numbers of the parents,unlike what they usually do in the intergeneric hybrids raised from other cereals as reported by many investigators.In meiosis of the hybrid,the chromosome behavior is very irregular,different numbers of uivilents and bivalents have been counted in different pollen mother cells,and one or two trivalents may also be pre- sent in some of the pollen mother cells.The trivalents are often V-shaped,but some- times they are chain-shaped.A number of lagging chromosomes have been met with at metaphases and anaphases of both first and second meiotic divisions.During the forma- tion of the restitution nuclei the laggards are often excluded,but they do not form micronuclei.In both heterotypic and homotypic meiotic divisions the spindle formation is regular.There is no unequal division of the pollen mother cell.Multipolar spindle and multispindle are not present,and finally normal tetrads result.However,the tetrads do not develop further and most of them soon degenerate.There is only a small number of floulets in the anthers of which a few fertile pollens have been observed.It is evident that all the irregularities occurred in the course of embryo-sac formation and differentia- tion together with the breakdown of the meiotic cycle in the pollen mother cells are the causes of the sterility of the F_1 hybrid plant.

1.本工作对于邓炎棠所获得的水稻北陆12-狼尾草杂种 F_1不孕植株进行了细胞学观察,附带对于胚囊的形成及雌配子体的分化作了简单的描述。2.在孕穗期固定的材料中观察到多数大孢子在形成过程中即退化而不能发育成胚囊。一些已形成的胚囊中没有细胞而也呈退化现象。雌配子体大多数不能正常分化为卵器、极核与反足细胞,或能分化而细胞的数目不正常,有时卵器中助细胞与卵细胞不能区分。在有一些情况下子房膨大而胚囊中充满了液体。仅在少数情况下观察到雌配子体的正常发育。3.母本水稻的染色体为 n=12,父本狼尾草的染色体为 n=9,而杂种 F_1的体细胞染色体变化在12—42之间,而在花粉母细胞中的染色体则变化在12—20之间,但也有多至30余者。4.在减数分裂中期Ⅰ及Ⅱ和后期Ⅰ及Ⅱ都经常看到有大量落后的染色体。在后期Ⅰ及Ⅱ偶然也遇到染色体桥。在末期Ⅰ及Ⅱ或甚至在形成四分孢子时仍经常观察到遗留在核外的染色体。但并不形成小核。5.在减数分裂的两次分裂中纺锺体的形成都是正常的,没有发现细胞的不等分裂,多极纺锺体或多纺锺体等现象。四分体的形成同样也是正常的,没有发现二分体或五分体等的形成。但是,小孢子形成后,其核大多数不能分裂,因而产生了败...

1.本工作对于邓炎棠所获得的水稻北陆12-狼尾草杂种 F_1不孕植株进行了细胞学观察,附带对于胚囊的形成及雌配子体的分化作了简单的描述。2.在孕穗期固定的材料中观察到多数大孢子在形成过程中即退化而不能发育成胚囊。一些已形成的胚囊中没有细胞而也呈退化现象。雌配子体大多数不能正常分化为卵器、极核与反足细胞,或能分化而细胞的数目不正常,有时卵器中助细胞与卵细胞不能区分。在有一些情况下子房膨大而胚囊中充满了液体。仅在少数情况下观察到雌配子体的正常发育。3.母本水稻的染色体为 n=12,父本狼尾草的染色体为 n=9,而杂种 F_1的体细胞染色体变化在12—42之间,而在花粉母细胞中的染色体则变化在12—20之间,但也有多至30余者。4.在减数分裂中期Ⅰ及Ⅱ和后期Ⅰ及Ⅱ都经常看到有大量落后的染色体。在后期Ⅰ及Ⅱ偶然也遇到染色体桥。在末期Ⅰ及Ⅱ或甚至在形成四分孢子时仍经常观察到遗留在核外的染色体。但并不形成小核。5.在减数分裂的两次分裂中纺锺体的形成都是正常的,没有发现细胞的不等分裂,多极纺锺体或多纺锺体等现象。四分体的形成同样也是正常的,没有发现二分体或五分体等的形成。但是,小孢子形成后,其核大多数不能分裂,因而产生了败育的花粉粒。仅在极少数花的花药中见到正常的花粉粒。6.正常发育的雌雄配子非常少,因而导致了杂种 F_1植株的高度不孕性。

 
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在学术趋势中查有关chromosome numbers的内容
 
 

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