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conventional cross
相关语句
  常规杂交
    The mutagenic effect of major economic characters and favourable variation in M_(2)F_3 , and variated characteristics and selective effect in M_(3)F_4 were studied with early indica rice F_1seeds irradiated by~(137)Cs-γ rays for 4 single and 2 multiple cross combinations. Conventional cross breeding procedures were conducted as being the control with same cross combinations.
    用~(137)Cs-γ射线辐照籼稻4个单交和2个复交组合的F_1代种子,以常规杂交处理作对照. 结合育种实践,研究了M_2F_3代主要经济性状突变频率,有利性状变异率以及M_3F_4代的变异特点和选择效果。
短句来源
    Third, it is introduced apomictic gene into rice by conventional cross, combination of conventional cross and tissue culture method, and gene transfer technique.
    3.利用常规杂交、杂交与组织培养结合以及基因转移方法向水稻引入无融合生殖基因。
短句来源
    The survival rate of the autotriploid plants obtained by the conventional cross method was very low ( 0.07% ), but that obtained by ovary culture method was higher (0.78%). Which surpassed 11.14 times than that of the former.
    通过常规杂交法所获得的同源三倍体成活植株的频率很低(0.07%),而通过采用杂种子房培养法所获得的同源三倍体植株的成活率比较高(0.78%),后者的效率比前者要高出11.1?
短句来源
    More research was suggested for further utilization of Erianthus F 1 through conventional cross.
    建议进一步进行研究 ,探索能否通过常规杂交方法 ,对斑茅F1进一步加以利用。
短句来源
  “conventional cross”译为未确定词的双语例句
    Although conventional cross breeding is the main approach to breed new resistant variety, it is less efficient.
    二是利用新的基因工程技术来培育转基因抗病水稻。
短句来源
    IRBB52, IRBB54 and IRBB60 which have the polymeric BLB resistant genes were used as the donors of BLB resistant genes and crossed with the blast resistant restorer lines CDR448, Minghui 63. New restorer lines with resistance to both BLB and blast could be developed by anther culture or conventional cross breeding methods.
    育种上可利用聚合有多个白叶枯病抗性基因的IRBB5 2、IRBB5 4、IRBB6 0等作为抗源供体 ,与抗稻瘟病恢复系CDR44 8、明恢 6 3等杂交 ,利用花培、常规遗传选育等方法 ,选育双抗恢复系
短句来源
    Objective:To combine the advantages of particle bombardment and conventional cross in breeding wheat with high qualities,expression of foreign gene in cross progenies between transgenic wheat and elite wheat were studied.
    目的:为了结合基因枪转化和传统杂交方法培育优质小麦品种,对转基因小麦和国内主栽小麦品种杂交后代外源基因遗传表达行为进行了研究。
短句来源
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  conventional cross
Various experimental techniques employed include conventional cross-sectional metallography, scanning electron microscopy, electron microprobe analysis, x-ray diffraction and others.
      
Alternatively, conventional cross-validation bandwidth selection is considered and performs rather well in simulation studies: Compared to standard pair-matching, kernel and ridge matching achieve reductions in MSE of about 25 to 40%.
      
However, determination of the self-compatibility of 'Osa-Nijisseiki' offspring requires a lot of time, 6 years or more, by conventional cross breeding.
      
In general, peptides are stable molecules, most of which retain their antigenicity after conventional cross-linking fixation and tissue processing, allowing standard immunocytochemical methods to be used for light- and electron microscopy.
      
The different hardness of fibre and coating makes it nearly impossible to use a conventional cross-section preparation.
      
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The tactics of fixing hybrids vigor of rice by apomixis are discussed in this article. Three steps of the research are posed. First, the basal demands of apomictic rice are determined. They are unsegregated offspring. Well developed endosperm, dominant nuclear gene controled obligate apomixis. There are three pathways to be obtained unsegregated offspring, i. e.diploidy spory. somatic apospory,somatic embryo derived from nucellus or integument squeezed into embryo sac and grew instead of zygot embryo. Second,...

The tactics of fixing hybrids vigor of rice by apomixis are discussed in this article. Three steps of the research are posed. First, the basal demands of apomictic rice are determined. They are unsegregated offspring. Well developed endosperm, dominant nuclear gene controled obligate apomixis. There are three pathways to be obtained unsegregated offspring, i. e.diploidy spory. somatic apospory,somatic embryo derived from nucellus or integument squeezed into embryo sac and grew instead of zygot embryo. Second, it is screened apomictic materials from cultivated rice, wild rice and their distant related species, espicially Poa and Pennisetum etc. with the apomictic character. Third, it is introduced apomictic gene into rice by conventional cross, combination of conventional cross and tissue culture method, and gene transfer technique.

本文对利用无融合生殖固定水稻杂种优势的策略进行了讨论。提出该研究可分三步进行:1.确定无融合生殖水稻的基本要求,即后代不分离,发育良好的胚乳,显性核基因控制的专性无融合生殖。其中获得不分离的后代有三条途径:二倍体孢子生殖,体细胞无孢子生殖,珠心、珠被等体细胞胚挤入胚囊取代合子胚发育;2.从栽培稻、野生稻及其远缘物种,特别是早熟禾属、狼尾草属等具无融合生殖特性的材料中挑选无融合生殖材料;3.利用常规杂交、杂交与组织培养结合以及基因转移方法向水稻引入无融合生殖基因。

The mutagenic effect of major economic characters and favourable variation in M_(2)F_3 , and variated characteristics and selective effect in M_(3)F_4 were studied with early indica rice F_1seeds irradiated by~(137)Cs-γ rays for 4 single and 2 multiple cross combinations. Conventional cross breeding procedures were conducted as being the control with same cross combinations. The result indicated that the mutation frequencies increased in M_(2)F_3 , and average mutation frequency of major economic...

The mutagenic effect of major economic characters and favourable variation in M_(2)F_3 , and variated characteristics and selective effect in M_(3)F_4 were studied with early indica rice F_1seeds irradiated by~(137)Cs-γ rays for 4 single and 2 multiple cross combinations. Conventional cross breeding procedures were conducted as being the control with same cross combinations. The result indicated that the mutation frequencies increased in M_(2)F_3 , and average mutation frequency of major economic characters in M_(2)F_3 generation of 6 combinations was 6.24% higher than that in F_ 3 generation. The mutation frequencies of multiple cross seeds treated by radiation were higher than that of single cross. The variation range of plant height, number of grain per panicle and 1000-grain weight and favourable character variation rate in M_(2)F_3 were found to be higher than that in F_3. The range of character in M_(3)F_4 was more narrow than that in F_4 for single cross and greater than that in F_4 for multiple cross. It shows that the segregation and stability of characters in the progenies of F_1 seeds treated by radiation were related to cross manner and heterozygosity of hybrids.

用~(137)Cs-γ射线辐照籼稻4个单交和2个复交组合的F_1代种子,以常规杂交处理作对照.结合育种实践,研究了M_2F_3代主要经济性状突变频率,有利性状变异率以及M_3F_4代的变异特点和选择效果。结果表明,辐照水稻杂种一代可提高变异率,6个组合M_2F_3主要经济性状突变频率平均比F_3提高6.24%;辐照复交杂种的突变频率大于辐照单交杂种。M_2F_3株高、每穗粒数和千粒重的变幅以及有利性状变异率大于F_3。单交组合M_3F_4性状变异小于F_4,复交组合M_3F_4性状变异大于F_4。表明辐照杂种F_1代性状的分离和稳定与配组方式和杂种的杂合程度有关。M_3F_4优良单株中选率比F_4平均提高0.55%。

The crossability of 30 hybridized and 6 selfcrossed combinations from the reciprocal crossing of 3 diploid rice (Oryza sativa L.) (2n=2x=24) and 3 autotetraploid rice (2n=4x=48) was investigated. The lower seed sets (10.01%~21.78%) of the autotetraploidy combinations may be attributed to the presence of more abnormal pollen in the anthers. The seed sets of the heteroploidy cross combinations were even lower (0.20% ~1.64%), but there was obvious different seed settings between the two mating methods....

The crossability of 30 hybridized and 6 selfcrossed combinations from the reciprocal crossing of 3 diploid rice (Oryza sativa L.) (2n=2x=24) and 3 autotetraploid rice (2n=4x=48) was investigated. The lower seed sets (10.01%~21.78%) of the autotetraploidy combinations may be attributed to the presence of more abnormal pollen in the anthers. The seed sets of the heteroploidy cross combinations were even lower (0.20% ~1.64%), but there was obvious different seed settings between the two mating methods. If the autotetraploid rice was used as the female parents and the diploids as the male parents, higher seed sets (0.42% ~1.64%) were found in the hybridized combination. However,the seed sets in the combinations were lower (0.20% ~0.85%) if the diploid rice was used as the female parents and the autotetraploids used as the male parents. The seed sets of the autoheteroploidy combinations could be outstandingly improved by repeating the pollination twice. Besides, the results from the embryological examination of APⅣ (4) ×APⅣ (2) cross showed that the total rate of fertilizations, including single fertilizations of an egg with a sperm (25.0%), two polar nuclei with a sperm (3.3%), and double fertilization of an egg and two polar nuclei with two sperms (5.9%), was lower(34.2%).The survival rate of the autotriploid plants obtained by the conventional cross method was very low ( 0.07% ), but that obtained by ovary culture method was higher (0.78%). Which surpassed 11.14 times than that of the former.

以3个二倍体水稻(OryzasativaL.)(2n=2x=24)和3个同源四倍体水稻(2n=4x=48)为杂交亲本配制6个自交组合和30个杂交组合。试验结果表明,同源四倍体组合的结实率比较低(10.01%~21.78%),这可能与其花药内所包含的正常花粉粒比例小而异常花粉粒比例大有关。异倍性杂交组合的结实率更低(0.20%~1.64%),但在两种配组方式之间却存在着明显差异,即以同源四倍体水稻为杂交母本而以二倍体水稻为杂交父本则其异交结实率比较高(0.42%~1.64%),反之,以二倍体水稻为杂交母本而以同源四倍体水稻为杂交父本则其异交结实率比较低(0.20%~0.85%)。在杂交时重复一次授粉能显著地增加多倍体组合的异交结实种子数。除此之外,对APⅣ(4)×APⅣ(2)杂交组合的胚胎学观察结果表明,其受精率比较低(34.2%),其中包括卵细胞的单受精(25.0%)、中央细胞的单受精(3.3%)以及卵细胞和中央细胞的双受精(5.9%)。通过常规杂交法所获得的同源三倍体成活植株的频率很低(0.07%),而通过采用杂种子房培养法所获得的同源三倍体植株的成活率比较高(0.78%),后者的效率比前者要高出11.1?

 
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