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varieties     
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  品种
    Studies on the Mechanism of Interaction between Rapeseed(Brassica napus)Varieties and Sclerotinia sclerotiorum
    油菜(Brassica napus)品种(系)与菌核菌(Sclerotinia sclerotiorum)相互作用机理研究
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    Genetic Diversity of both Rice Varieties and Blast Pathogen,Magnaporthe grisea and Sustainable Control of the Disease
    水稻品种与稻瘟病菌的遗传多样性及稻瘟病持续控制研究
短句来源
    Study on Fingerprinting Markers and Identification Techniques of Main Rice Hybrid Varieties in China
    中国主要杂交水稻品种指纹图谱标记和鉴定技术的研究
短句来源
    Extraction and Purification of β-glucan, RAPD Analysis of the Varieties and Cloning and Expression of HBGHⅡ Gene from Tibetan Hulless Barley
    青稞β-葡聚糖的分离纯化、品种RAPD分析及HBGH2基因的克隆表达
短句来源
    Study and Evaluation on Resistances, Production and Quality Characteristics of Different Alfalfa (Medicago Sativa) Varieties
    不同苜蓿(Medicago Sativa)品种抗逆性、生产性能及品质特性研究
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  变种
    CLASSIFICATION AND IDENTIFICATION OF VARIETIES OF CHINESE CULTIVATED BARLEY
    中国栽培大麦的分类和变种鉴定
短句来源
    Methods: The rDNA ITS regions of the Perilla varieties were sequenced and analyzed by Clustal X 1.8, MEGA 3.0. Allele-specific diagnostic PCR primers that can authenticate all the Perilla varieties were designed based on SNPs loci.
    方法对紫苏属各变种多个体的rDNA ITS 区全序列进行了准确测定,运用Clustral X 1.8、MEGA 3.0进行排序并进行SNP分析,从而设计出鉴别各变种的等位基因位点特异性PCR鉴别引物。
    RESULTS: The length of rDNA ITS sequences of Perilla varieties ranged from 612 to 615 bp in size, including ITS1 (230-232bp), 5. 8S (179bp) and ITS2 (203-204bp). The GC content is about 61. 5%-61. 9%.
    结果紫苏属各变种(紫苏、白苏、鸡冠苏、耳齿紫苏等)的rDNA ITS区全序列共有615—618bp的长度,ITS1为233—235bp,5.8S为179bp,ITS2为203—204bp,GC含量为61.5%-61.9%。
    Distribution and Composition Study of Tibetan Cultivated Barley Varieties
    西藏栽培大麦变种组成和分布规律研究
短句来源
    It is reported that there are 61 species, 50 varieties, and 5 metatypics from Fritillaria.
    据报导,目前我国贝母属植物有61种,50个变种,5变型。
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  品种的
    BLAST RESISTANCE CLASSIFICATION OF SOME RICE VARIETIES IN CHINA
    中国部分水稻品种的抗瘟性分类
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    STABILITY ANALYSES OF INTRODUCED SUGARCANE VARIETIES
    甘蔗引进品种的稳定性分析
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    A COMPARISON OF 6 ISOZYMES IN THE 12 SPECIES AND VARIETIES OF SUGARCANE
    甘蔗12个种和品种的6种同工酶比较
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    The Interaction between Wheat Varieties and Powdery Mildew of Cereals (Erysiphe Gramiunis f. sp.Tritici)——Ⅱ. Analysis of the Definitive Genotypes of Wheat Varieties
    小麦品种与小麦白粉菌的相互作用——Ⅱ.小麦品种的限定性基因型分析
短句来源
    STUDY ON ECOLOGICAL ADAPTABILITY OF SOYBEAN AND ITS APPLICATION IN GUIZHOU —— Ⅱ ECOLOGICAL CONDITION FOR SOYBEAN CULTIVATION OF GUIZHOU ANE THD REGIONAL ADAPTABILITY OF VARIOUS VARIETIES
    贵州大豆生态适应性及其应用研究——Ⅱ.贵州大豆的区域生态及品种的区域适应性
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  个品种
    STUDIES ON THE EXOTIC SUGARCANE GERMPLASM Ⅰ. Expression of major traits and evaluation in 40 sugarcane varieties from 4 series
    甘蔗引进品种资源的研究 Ⅰ.4个系列40个品种(系)的主要性状表现与评价
短句来源
    Study on the Exotic Sugarcane Varieties Ⅱ.Expression of Major Traits and Utilization in 34 Sugarcane Varieties of 4 Series
    引进甘蔗品种的研究——Ⅱ、4个系列34个品种(品系)的主要性状表现及其利用
短句来源
    Studies on the Exotic Sugarcarie Germplasm── Ⅲ.Expresion of Germination Characteristic in 163 Sugarcane Varieties from 10 Series
    甘蔗引进品种资源的研究──Ⅲ.10个系列163个品种(系)萌芽特性的表现
短句来源
    In this article,the yield stability of 11 new spring-planting peanut varieties,which attended the regional trials of Fujian province in 2005,were analysed with Tai model.
    运用Tai模型对2005年参加福建省春花生新品种区域试验的11个品种的产量稳定性进行了分析。
短句来源
    7 varieties such as Longhua 3,Longhua 163 were unstable;
    龙花3号、龙花163等7个品种表现为不稳定性品种;
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      varieties
    Euler characteristic of certain affine flag varieties
          
    Degenerations of flag and Schubert varieties to toric varieties
          
    In this paper, we prove the degenerations of Schubert varieties in a minusculeG/P, as well as the class of Kempf varieties in the flag varietySL(n)/B, to (normal) toric varieties.
          
    As a consequence, we obtain that determinantal varietes degenerate to (normal) toric varieties.
          
    We show that wonderful varieties are necessarily spherical (i.e., they are almost homogeneous under any Borel subgroup ofG).
          
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    1.This paper includes two parts,namely the study of flowering biology and crossing technique in sweet potato,and the 3-year experi- mental results of several hybrid lines, 2.When a “short-day”condition of 8 hours was provided,sweet potato plants flowered about 10-25 days earlier than that under natural condition in Foochow.However,it varied with different varieties, different stages of treatment and environmental factors. 3.The percentage of cross-fertility,based on more than 1000 crosses we made during...

    1.This paper includes two parts,namely the study of flowering biology and crossing technique in sweet potato,and the 3-year experi- mental results of several hybrid lines, 2.When a “short-day”condition of 8 hours was provided,sweet potato plants flowered about 10-25 days earlier than that under natural condition in Foochow.However,it varied with different varieties, different stages of treatment and environmental factors. 3.The percentage of cross-fertility,based on more than 1000 crosses we made during a 4-year period,was about 45%.It seems that “mixed-pollination” and “repeated pollinaation”tended to increase the percentage of cross-fertility. 4.According to the 3-year experimental results,the hybrid lines, 5414-5 and 5414-8,were found to be hetter than their parents,Triumph 100 and Yoliow Sweet Potato,in yield.The hybrids were also superior to their parents in vine production.It seems that the hybrids were more adaptaple to environment conoitions than their parents. 5.The problem regarding the choice on combinations of parental pairs is discussed.The principle of choosing psrental pairs from geo- graphically distant locaties,propossd by I.V.Michurin,is a guide to sove this problem.A great number of hybrid lines are undergoing study.

    1.本文包括两部分,即甘薯开花生物学和有性杂交技术的研究及几个杂交系的三年试验结果。2.当给以8小时短日条件,甘薯植株比在福州自然条件下的提早开花10——25天。但因品种、处理时期及环境条件而不同。3.根据四年来杂交一千余朵花的结果,甘薯杂交成功率约为45%。混合授粉及重复授粉似乎有增加杂交成功率的趋势。4.根据三年试验结果,发现二个杂交系,即5414——5和5414——8,在块根产量上比亲本胜利百号及黄薯都高。在蔓的产量上,杂交系亦比较亲本为优。而且这两个杂交系似乎比亲本具有较大适应不同环境条件的能力。5.关于选择亲本组合的问题曾加以讨论。米丘林所提出关于选择远地亲本的原则,对于这个问题的解决具有指导的作用。许多杂交系尚在继续研究中。

    (The Kiangsu Affiliated Academy of the Chinese,Academy of Agricultural Sciences)Hybrid vigour in cotton has been reported by a number of workers.Most of them dealtwith interspecific hybrids.They were mostly marked with an increase in plant growth,especially in the F_1 crosses of American Upland × Sea-island and American Upland × Egyptiancotton.In order to study the possibility of producing an extra long fibre cotton in the Yang-tze basin and the Hwangho Plain by making use of hybrid vigour,the following problemswere...

    (The Kiangsu Affiliated Academy of the Chinese,Academy of Agricultural Sciences)Hybrid vigour in cotton has been reported by a number of workers.Most of them dealtwith interspecific hybrids.They were mostly marked with an increase in plant growth,especially in the F_1 crosses of American Upland × Sea-island and American Upland × Egyptiancotton.In order to study the possibility of producing an extra long fibre cotton in the Yang-tze basin and the Hwangho Plain by making use of hybrid vigour,the following problemswere investigated at Nanking,Kiangsu during 1959-1962.(1)Combining ability between different interspecific crosses with special reference toyield,earliness and fibre qualities.(2)Morphological and physiological characters of economic importance in F_1 hybrids.(3)Performance of promising hybrids in field production.(4)Method of producing hybrid seeds with cheaper cost and less labour.Fifty-nine combinations were studied from 1960 to 1962,among which Pong-zai No.1(Upland cotton)×L.S.4923(Sea-island)was the best in yield and earliness.The averageyield of this F_1 hybrid in three years with 178 kg.of seed cotton or 53.7 kg.of lint cotton permow.As compared with the parents it was 94.35% of seed cotton or 82.2% of lint cotton ofthe yield of Delta-upland cotton and 187.17% of seed cotton or 172.74% of lint cotton of theyield of Sea-island L.S.4923.The fibre quality of F_1 hybrids approached Sea-island parent with a mean fibre length of40 m.m.,mean fibre fineness of 7000 meters per gram wt.,and single fibre strength of 4.5g.The methods and procedures for producing commercial hybrid cotton seed were as follows:(1)Hybrid F_0's seed was produced by hand emasculation and pollination which was ofvalue in areas abundant with hand-labor or adapted to transplanting for saving seeds up to4/5.(2)The female parent with recessive markers,was pollinated by hand without emascula-tion.In the thinning of the hybrid progeny all recessive plants were removed,leaving onlythe true F_1's.The recessive characters used for markers were virescent yellow foliage,redstem and hairy petiole of the seedling.The percentage of hybrid seed setting for differentupland cotton varieties ranged from 13% to 78%.Observations on heterosis in the characters of F_1 hybrids of G.hirsutum×G.barbadensewere summarized as follows:Plant Characters Comparison of bybrid with Upland and Seaisland parentsDays from planting to seedling Earlier than either parentDays from budding to flowering Intermediate nearer to earlier UplandDays from seedling to boll maturity Intermediate nearer to late Sea-island Days of bud development Intermediate nearer to earlier UplandDays of boll development Longer than Sea-islandDays from seedling to first boll maturity IntermediatePlant height Taller than either parentNumber of monopodia Less than either parent,but approaching Up landNumber of sympodia More than either parentNumber of fruiting points per plant More than either parentPosition of main stem nodes where first fruiting branch appears Lower than either parentInternode length of axis Longer than either parentInternode length of fruiting branch Longer than either parentPetiole length Longer than either parentLeaf area Larger than either parentLeaf lobe index Intermediate,approaching Sea-islandShedding percentage IntermediateDistribution of bolls in different parts of the plant Approaching Sea-island,most bolls setting at middle and upper parts of the plantWeight of seed cotton per boll IntermediateNumber of ovules per boll Approaching Sea-island in a lower numberMotes percentage More than either parentPistil length IntermediateCorolla area and index Larger than either parentSeed index Larger than either parentLint index IntermediateMaturity Intermediate,approaching late Sea-islandFibre length Longer than either parentFibre fineness Approaching Sea-islandYield in seed cotton Approaching Upland,higher than Sea-islandYield in lint cotton Lower than Upland,higher than Sea-islandProduction of dry matter More than either parentProduction of dry matter per square meter of leaf area More

    1959—1962年试验证明,海陆杂种一代具有早熟、丰产、优质的特性。海陆杂种一代的籽棉产量接近陆地棉,而显著高于海岛棉。成熟期较海岛棉早,比陆地棉偏迟。生育特性一般介于两亲之间,不同程度的偏向于海岛棉,有的特性超过两亲范围以外。纤维细长,强度高,可以制成高挡纺织品。在江苏各地示范试种结果良好。在制种技术方面研究证明,采用具有某一隐性指示性状,进行不去雄杂交(人工辅助授粉),杂交率达70%,每工作日可制种6—8斤。

    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。

     
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