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utilization of heterosis
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  杂种优势利用
     STUDIES ON UTILIZATION OF HETEROSIS OFANTHER PLANTS FROM THE F1 HYBRID BETWEEN Brassica oleracesa AND B. parachinensis
     甘蓝(Brassica cleracea)与菜心(Brassica parachinensis)F_1花粉植株杂种优势利用研究初报
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     There are two ways in utilization of heterosis in rapeseed .
     油菜杂种优势利用途径主要有三系法和两系法。
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     Studies on the Utilization of Heterosis in Mustard(Brassica Junces)
     芥菜型油菜(Brassica Juncea)杂种优势利用的研究
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     Idea and Practice of Utilization of Heterosis between Rice Subspecies
     亚种间杂种优势利用的设想与实践
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     Significant endosperm and maternal dominance effects for BRT suggest that the utilization of heterosis for BRT is viable.
     胚乳显性方差和母体 显性方差均达到显著水平,表明对糙米厚性状进行杂种优势利用是可行的。
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  杂优利用
     ANALYSIS OF COMBINING ABILITIES UTILIZATION OF HETEROSIS IN WATERMELON
     西瓜杂优利用中的配合力分析
短句来源
     There was higher heterosis of dough quality in F2 generation hybrid, which was very important for utilization of heterosis in wheat. It was easier to improve sedimentation value and wet gluten content than to improve protein content by utilization of heterosis.
     杂种小麦F_2代存在较强的面团品质杂种优势,对于小麦杂优利用十分可贵; 通过杂种优势利用改良沉淀值和湿面筋含量比提高蛋白质含量容易;
短句来源
     Beginning from 1986, we have displayed researches, centralized in the utilization of heterosis, for vigorous hybrids with lower erucic acid and higher oleic and linoleic acid contents and higher disease resistance.
     从1986年开始,开展了降低芥酸含量,提高油酸和亚油酸含量,提高抗病性,以杂优利用为中心的优质强优势杂交油菜的选育。 育成了自交结实指数在1以下,不育株率100%,芥酸含量0.03-2.51%,亚油酸含量28.30-33.09%的89S181等6个不育系。
短句来源
     Three stages of varieties evolution including introduction of varieties of tomato, pedigree selection of varieties introduced and descendants hybridized, and utilization of heterosis and breeding in resistance to diseases were reviewed. me developing trend and sibship of varieties of tomato were researched.
     综述番茄品种引进、引进品种系选及杂交后代系选、杂优利用及抗病育种三个阶段的品种演变情况,探讨番茄品种发展趋势和亲缘关系。
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  “utilization of heterosis”译为未确定词的双语例句
     A Preliminary Analysis on Yield Heterosis and Main Yield Characters of F1,F2,F3 in B-type Hybrid Hsien Rice——A Study on Multiple Generation Utilization of Heterosis in Three Lines Hybrid Rice
     B型杂交籼稻的F_1、F_2和F_3产量优势及有关性状的初步分析——三系杂交稻多代利用的探讨
短句来源
     Understanding of Some Basic Problems in Utilization of Heterosis of Plant Distant Hybrids by Directly Introducing Exogenous DNA
     直接导入外源DNA利用植物远缘杂种优势若干基本问题的认识
短句来源
     Discussion on utilization of heterosis in sweet sorghum
     在甜高粱上利用杂种优势的探讨
短句来源
     5. Research and application of cytoplasmic male sterility (CMS) can promote utilization of heterosis in pepper-96-140 yellow bud mutant (96-140YBM) .
     5.以辣椒H97643分离世代中胞质雄性不育株为不育源,通过测交、回交进行辣椒黄绿苗96-140突变体(96-140YBM)的雄性不育的转育。
短句来源
     However, Guang A has disadvantages as well as advantages in the utilization of heterosis because of its low lint percentage in parent propagation and hybrid seed production.
     但因光A纯合态的低衣分,其亲本繁殖和杂交制种时皮棉产量降低,故光A不育系在杂种优势中的利用有优势又有劣势。
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  utilization of heterosis
Utilization of heterosis in corn breeding and the production of hybrid seed
      
Hybrids between indica and japonica rice varieties usually show partial sterility, and are a major limiting factor in the utilization of heterosis at subspecific level.
      
Open flower could contribute to a higher rate of cross pollination and utilization of heterosis.
      
The practical utilization of heterosis in crop plants has been greatly facilitated during the past 15 years by the use of cytoplasmic male|sterility for low-cost, large-scale emasculation of the seed parents of hybrids.
      
For commercial utilization of heterosis in rice, effective male sterility and fertility restoration systems are available and up to 45% natural outcrossing on male sterile lines has been observed.
      
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For cooperation to the utilization of heterosis and the selection of“three lines”in crops by the people,we have studied tbe metabolic condition of“three lines”inSorghum and rice with irradiant isotops.Experiments indicate that:in the flowerorgan of male sterile plants during the cells inside the anther developing to thestage of microspore or of single nucleic pollen,metabolic blocks rhythmicallydevclopes.This kind of metabolic blocks is mainly relative to the metabolism ofnucleic acid and proten in the...

For cooperation to the utilization of heterosis and the selection of“three lines”in crops by the people,we have studied tbe metabolic condition of“three lines”inSorghum and rice with irradiant isotops.Experiments indicate that:in the flowerorgan of male sterile plants during the cells inside the anther developing to thestage of microspore or of single nucleic pollen,metabolic blocks rhythmicallydevclopes.This kind of metabolic blocks is mainly relative to the metabolism ofnucleic acid and proten in the cells.At that time the tapetums cell also developedphysiological and morphological variation.this paper may be helpful to advancedlyrecognize the partial internal mechanism produced the abortion of pollen controlingby the hereditary gene of male sterile in the cell.

配合群众性杂种优势利用及“三系”选育科学实验,应用放射性同位素对高粱及水稻“三系”植株的代谢情况进行了研究。实验表明:在不育系植株当花药内的细胞处于小孢子或单核花粉阶段的花部器官中,有规律地发生了代谢障碍,这种代谢障碍主要与细胞中核酸和旦白质的代谢有关;此时,毡绒层细胞也发生了生理、形态上的变化。本文有助于进一步认识细胞内雄性不育遗传因子控制花粉败育性状形成的部份的内在机理。

For cooperation to the utilization of heterosis and the selection of "three lines" in crops by the people, we have studied the metabolic condition of "three lines" in Sorghum and rice with irradiant isotops. Experiments indicate that: in the flower organ of male storile plants during the cells inside the anther developing to thestage of microspore or of single nucleic pollen, metabolic blocks rhythmically developes. This kind of metabolic blocks is mainly relative to the metabolism of nucleic acid and...

For cooperation to the utilization of heterosis and the selection of "three lines" in crops by the people, we have studied the metabolic condition of "three lines" in Sorghum and rice with irradiant isotops. Experiments indicate that: in the flower organ of male storile plants during the cells inside the anther developing to thestage of microspore or of single nucleic pollen, metabolic blocks rhythmically developes. This kind of metabolic blocks is mainly relative to the metabolism of nucleic acid and protein in the cells. At that time the tapetum cells also developed physiological and morphological variation. This paper may be helpful to advancedly recognize the partial internal mechanism produced the abortion of pollen controling by the hereditary gene of male sterile in the cell.

配合群众性杂种优势利用及“三系”选育科学实验,应用放射性同位素对高梁及水稻“三系”植株的代谢情况进行了研究。实验表明:在不育系植株当花药内的细胞处于小孢子或单核花粉阶段的花部器官中,有规律地发生了代谢障碍,这种代谢障碍主要与细胞中核酸和蛋白质的代谢有关;此时,毡绒层细胞也发生了生理及形态上的变化。本文有助于进一步认识细胞内雄性不育遗传因子控制花粉败育性状形成的部分的内在机理。

By means of crossing two forms of wild rice (Oryza sativa L. f. spontanea) : "red-awned" and "Tengqiao local" from the Island of Hainan as the female parent with cultivars as the male and repeated back-crossing we have obtained several male-sterile lines of rice. We also succeeded in selecting some sterility-maintainers and fertility-restorers for them respectively to facilitate the utilization of heterosis in rice.It is noteworthy that the two forms of wild rice have different kinds of cytoplasm and they...

By means of crossing two forms of wild rice (Oryza sativa L. f. spontanea) : "red-awned" and "Tengqiao local" from the Island of Hainan as the female parent with cultivars as the male and repeated back-crossing we have obtained several male-sterile lines of rice. We also succeeded in selecting some sterility-maintainers and fertility-restorers for them respectively to facilitate the utilization of heterosis in rice.It is noteworthy that the two forms of wild rice have different kinds of cytoplasm and they respond differentially to test crosses. Therefore the male-sterile lines derived from the two wild rices have quite different restorer lines.From genetical and cytological studies it is evident that male sterility is not controlled by one or a few genes of sterility. But rather male sterility is determined by the nucleo-cytoplasmic contradictions (incompatibility) between the two parental forms: the wild rice as the female parent and the cultivar as the male. Hence substitution of cell nucleus by means of repeated back-crossing is an effective method of breeding male-sterile lines in rice. Inheritance of male sterility in hybrid progenies of crossing wild rice with cultivars and F2 of male-sterile lines × fertility-restorers is shown as if in the mode of inheritance of "quantitative characters". The segregation of fertility versus sterility behaves as continuous variation with numerous gradations from normally fertile to wholly sterile. This fact accentuates the invalidity of such a theory, proposing one or a few "ms" genes as the explanation of the origin of male sterility.Our investigation suggests, that the metabolic disorders as the result of nucleo-cytoplasmic contradictions are the cause of pollen sterility. Therefore, genetic affinity determines whether a variety being tested will be "maintainer" or "restorer" for a given male-sterile line. If the variety has close affinity and a similar cytoplasm with the wild parent, it may restore the right nucleo-cytoplasmic interrelation, normalize the metabolic processes in the hybrid and re-establish normal development of pollen grains. On the contrary, if the variety has distant affinity and a dissimilar cytoplasm with the wild parent, it will fail to normalize microsporogenesis in the hybrid and will serve as a maintainer of sterility.Thus the Marxist materialistic dialectics aids us in finding a new approach to the solution of problems of breeding hybrid rice.

以属于我国南方分布的普通野生稻(Oryza sativa L.f.spontanea)的红芒野生稻和藤桥野生稻作母本,与栽培稻不同品种作父本杂交和连续回交,进行核代换,培育出了相应的雄性不育系。并已获得相应的恢复系。在选育三系的过程中证明我国南方的普通野生稻在细胞质的生理和遗传特性上存在着不同类型,对三系选育有不同的利用价值。 从有关的遗传学及细胞学研究说明这种雄性不育性不是一种简单的遗传特性,而是牵涉到一系列遗传、生理特性的异常,有着复杂的遗传基础。不育性和恢复性表现出类似于数量性状的遗传行为。作者认为雄性不育性是参加核代换亲本的遗传基础相互作用的结果,是远缘核质不亲和性的表现。当远缘的核质结合时产生雄性不育,而近缘的核质结合时造成花粉育性的恢复,因此三系配套与亲本亲缘的远近密切相关,从而批判了旧的三系理论及其所设想的育种方法。

 
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