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Effects of garlic and black grape extracts on the activity of adenosine deaminase from cancerous and noncancerous human urinary
      
A black-scholes formula for option pricing with dividends
      
We obtain a Black-Scholes formula for the arbitrage-free pricing of European Call options with constant coefficients when the underlying stock generates dividends.
      
The impact of different interference substrate materials for improving the color travel effect was studied, and the influence of white and black background on the hue and the color travel effect were studied.
      
Nutrient Dynamics of Fine Roots in the Mixed Plantation of Poplar and Black Locust
      
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This work was conducted in 1955-1956 at Nanking (32°03'N'),China.800 rice varietiesnative to China were collected and sowed under the day-length of 9.5,11.5,12.5,13.5,and 18hrs.and natural day-length as control.Bamboo frames with black oil-cloth were used to shutoff day-light for short-day treatments.While electric lamps were used to lengthen naturalday-length for long-day treatments.Seeds soaked with water for 36 hours and vernalized at25℃ for 12 days and then,sowed on May 20:It was demonstrated that...

This work was conducted in 1955-1956 at Nanking (32°03'N'),China.800 rice varietiesnative to China were collected and sowed under the day-length of 9.5,11.5,12.5,13.5,and 18hrs.and natural day-length as control.Bamboo frames with black oil-cloth were used to shutoff day-light for short-day treatments.While electric lamps were used to lengthen naturalday-length for long-day treatments.Seeds soaked with water for 36 hours and vernalized at25℃ for 12 days and then,sowed on May 20:It was demonstrated that even under warm and proper short-day conditions—commonly9,5 to 11.5 hours of exposure to light for 24 hrs.cycle—the length of growth periods (fromsowing to heading) for different rice varieties varied from 42 (The shortest one Changjidao,a native variety of changji,Xinjiang) to 88 days (The longest one,Hongzuijia,a nativevariety of Fenghua,Zhejiang).This characteristics of rice varieties was denoted by the term“short-day growth period”.According to length of growth period under short-day conditionwe divided the rice varieties into 10 classes as follows:The rice varieties were thus classified and the result was listed'in table 1.It shows thatthe rice varieties from South China varies from B_1 to B_(10);the Middle and South-western Chinavarieties,from B_2 to B_9;the North China varieties,from B_2 to B_7;the North-eastern Chinavarieties,from B_2 to B_6,and the North-western China varieties,from B_1 to B_3.This resultstrongly indicates that the property of “short-day growth period”of a rice variety is closelyrelated to the climatic conditions of its original habitat.In regions of high latitude or plateauwith high altitude,usually accompanied with shorter growing season,the rice varieties withshorter length of growth period would be suitable for cultivation;while in plains of lowlatitude,usually followed by longer growing season,the rice varieties with either shorter orlonger length of growth period might be recommended for use.The earliness of maturity of a rice variety is fully determined by its “short-day growthperiod”and response to day-length.Thus we had in Nanking: L,response to day-length;B,“short-day growth period”.The yield components,especially the number of spikelets per panicle varied greatly amongthe rice varieties of different response to day-length under the conditions of experimentaltreatments.The data show that for very weak response type of rice varieties,the averagenumber of spikelets per panicle varied from 9.5% to 105% (take average number of spikeletsper panicle under 11.5 hrs.of light exposure in 24 hrs.cycles as 100%) under the testedrange of day-length;for weak type 90%-120%;for moderate type 0-124%;for strong type0-218%;and for very strong type 0-150%.Thus,it is evident that the stronger the varietyresponds to day-length,the greater,the variations of the number of spikelets per panicle wouldbe.This was further confirmed by the evidence that rice varieties of L very weak andL weak types always show greater ability of adaptation to changed conditions.Hence,moreattention should be paid to rice varieties of these two types for specialists of seed improve-ment.It should be emphasized especially for seed improvement of subsp.Keng,because onlya few varieties now existed are of L very weak and L weak types with medium “short-daygrowth period”.Such types of rice varieties are urgently needed in present crop-production.

用800个中国水稻品种试验的结果指出:不同地区原产的品种不但对光照长度的反应特性不同,而且在短日照下的生育期也不同。这种特性称为短日生育性。北方的品种短日生育性较小;南方的品种从小到大都有。品种成熟期的早晚是其光照长度反应特性和短日生育性在一定环境条件下的具体表现,改变环境条件时,早晚熟的顺序随之改变。对光照长度反应弱的品种一般产量变化小,适应力大。试验结果得出各地区品种的光长反应特性和短日生育性。

The study of application of F_1 cabbage hybrid and its genetic behaviours was made in 1971-1979. The superior single plants were selected and selfing continuously with the basic materials namely Peking Early, Welcome Spring, King early and staxanovka. According to the main economic characteristics, compatibility and combining ability, six superior self-incompatible lines were released which are provided with more uniformity, higher yield, and have been used as good parents to produce F_1, hybrids. In addition,...

The study of application of F_1 cabbage hybrid and its genetic behaviours was made in 1971-1979. The superior single plants were selected and selfing continuously with the basic materials namely Peking Early, Welcome Spring, King early and staxanovka. According to the main economic characteristics, compatibility and combining ability, six superior self-incompatible lines were released which are provided with more uniformity, higher yield, and have been used as good parents to produce F_1, hybrids. In addition, using the six self-incompatible lines as indicated above and Black Leaf self-incompatible line introduced from Shanghai Vegetable Research Institute, more than 160 combinations have been made, and one early and two mid-early superior combinations were selected among them. The genetic behaviours of the incompatibility in cabbage has been studied along with the development of self-incompatible lines and combinations.

关于甘兰杂种一代利用及其遗传行为的研究是在1971—1979年进行的。以北京早熟、迎春、金早生、斯达哈诺夫卡等品种为材料,选择优良单株连续自交。根据主要经济性状、亲和性、配合力进行选择并共培育出六个优良自交不亲和系。其同共特性是:性状整齐一致,高产并可作为配制一代杂种的优良亲本。利用上述培育的甘兰自交不亲和系及引自上海园艺研究所的黑叶小平头自交不亲和系的材料,进行了160多个组合搭配,从中选育出一个早熟、二个中早熟优良组合。在培育自交不亲和系及选配优良一代组合过程中也研究了甘兰遗传行为。

T. aestivum was directly crossed with H.villosa, and the hybrids were backcrossed with T. aestivum. Their F_1,BC_1 and BC_2 were successfully obtained.Generally, the cross ability of T. aestivum with H, villosa is significantly lower than that of tetraploid wheat, However, the seed set of Nannong Big Black Awned,a common wheat variety developed from an interspecitic hybridization between T.aestivum and T. turgidum, reached a fertility as high as 3.5% when it crossed with H. villosa.The somatic chromosome...

T. aestivum was directly crossed with H.villosa, and the hybrids were backcrossed with T. aestivum. Their F_1,BC_1 and BC_2 were successfully obtained.Generally, the cross ability of T. aestivum with H, villosa is significantly lower than that of tetraploid wheat, However, the seed set of Nannong Big Black Awned,a common wheat variety developed from an interspecitic hybridization between T.aestivum and T. turgidum, reached a fertility as high as 3.5% when it crossed with H. villosa.The somatic chromosome number of F_1 plants corresponded literally to the theoretically expected value, viz. 2NF_1=N(?)+N(?).Most of the chromosomes from their parents were univalents at MI of meiosis of PMC, bat rod-bivalents and even ring-bivalents also appeared in F_1 hybrids with genomic constitution of DV. The numbers of bivalents, trivalents and quadrivalents per PMC at MI of meiosis in F_1 hybrids ABV, AGV and ABDV were much higher than those in the induced haploids AB, AG and ABD respectively. It suggested that homoeologous pairing might exist between the chromosomes of V genome and A, B, D and G genomes besides similar pairing between the chromosomes of genomes A, B, D and G.Some partial fertility was found in BC_1 plants when T. aestivum had been used as a female parent of the first crosses. Some plants with the somatic chromosome number approximate or equal to 49 occured in BC_1, and about 20 bivalents and 5—7 univalents per PMC at meiotic MI could be observed. The alien addition lines with individual Haynaldia chromosome were frequently obtained from selfpollinating or backcrossing offsprings of these plants. The somatic chromosome number of BC_2 approached rapidly to 42 and the fertility and agronomic characters of BC_2 were restored nearly to the level of T. aestivum. Besides the plants with individual additional Haynaldia chromosome,plants involving substitution or translocation between chromosomes of T. aestivum and H. villosa were also found in BC_2. Thus, in order to transfer germplasm from H.villosa into T.aestivum, the T.aestivum could be considered as a more suitable original female parent as compared with the tetraploid wheat.The esterase isozyme patterns of F_2 and BC_1 plants showed a similar tendency, as corresponding cytological and genetical analysis did.

本研究直接用普通小麦作母本与簇毛麦杂交并用普通小麦回交,成功地获得了它们的F_1、BC_1和BC_2。F_1植株的体细胞染色体数与理论值相符:2N_(F1)=N♀+N♂。来自双亲的染色体在PMC的MI以单价体构型为主,但在DV中还可看到棒状甚至环状二价体,在ABV、AGV和ABDV中的二价体、三价体和四价体数均高于其母本物种的单倍体AB、AG和ABD中的相应数值,从而推测可能存在V组与A、B、D组染色体间的同源转化配对。虽然普通小麦比四倍体小麦更难与簇毛麦杂交,但以普通小麦作原初杂交母本的BC_1,中已出现部分可育植株,并出现了一些2n等于或接近49的植株,它们的PMC在MI有20个左右二价体和5—7个单价体。在BC_2中,2n数迅速趋近42,其育性及农艺性状迅速恢复,并已较快地分离出在整套普通小麦染色体上添加了个别簇毛麦染色体或与簇毛麦个别染色体发生了置换或易位的植株。因此,为将簇毛麦种质较快地导入普通小麦,用普通小麦作原初杂交母本比用四倍体小麦更为有利。

 
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