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major
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    Mapping of Major QTL Regions and Identification of Putative Candidate Genes for Drought Tolerence in Maize
    玉米耐旱效QTL定位与候选基因鉴定
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    Chromosome Localization and Development of Molecular Markers for a Major Stripe Rust Resistance Gene in Wheat Variety C591
    小麦品种C591中一个效抗条锈病基因的定位与分子标记研究
短句来源
    Analysis of QTLs Affecting Traits of Agronomic Importance and Construction of Near Isogenic-lines with Major QTL
    水稻重要农艺性状的QTL分析和效QTL近等基因系的构建
短句来源
    Genetic Analysis for Qualitative-Quantitative Traits Ⅰ.The Genetic Constitution of Generation Populations and the Identification of Major Gene Genotypes
    质量-数量性状的遗传分析 Ⅰ.遗传组成和基因基因型鉴别
短句来源
    Identification of Major Gene and Polygene Mixed Inheritance Model and Estimation of Genetic Parameters of a Quantitative Trait from F_2 Progeny
    利用杂种F_2世代鉴定数量性状基因-多基因混合遗传模型并估计其遗传效应
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    Application Of Factor Analysis To Correlation Studies Of Major Agronomic Traits In Sunflower
    因子分析在向日葵农艺性状相关研究中的应用
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    Application of Factor Analysis to Correlation Studies of Major Agronomic Traits in Soybean
    因子分析在大豆农艺性状相关研究中的应用
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    PRELIMINARY STUDY ON HERITABILITY AND GENETIC ADVANCE OF MAJOR GROWING STAGE OF.JUNCEA IN GUIZHOU
    贵州芥菜型油菜生育期的遗传力和遗传进度初步研究
短句来源
    BREEDING OF A NEW SPRING WHEAT CULTIVAR GANCHUN 16 USING ANTHER CULTURE AND ANALYSING OF ITS MAJOR CHARACTERISTICS
    花培春小麦新品种甘春16号的选育及其特性分析
短句来源
    Salt-Tolerance Rice Mutant Lines Controlled by a Major Effect Gene Were Obtained by Cell Engineering Technique
    应用细胞工程获得受主效基因控制的水稻耐盐突变系
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  major
Our major contribution in this paper is to show the following.
      
A major role in this study is also played by arbitrary ultraflat polynomials, that is, including those that are
      
Delivery of vaccine is a major impediment to ensuring vaccine efficacy and compliance.
      
The results indicate that thermodynamic and electronic parameters are major contributors to the activity.
      
The results indicate that electronic and thermodynamic parameters are major contributors to the activity.
      
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The drought injury of rice plants of two varieties was compared at booting and bloomingstage with reference to the internal water relation of plant.When the plant of variety “ShengLi Xian”was exposed to soil drought at booting stage water content in the young earsignificantly decreased,growth and development of ear almost ceased until the flooded statehad been restored.While in the case of the plant of variety “Lao Lai Ching”,the young earwas somewhat well provided with water,so that its growth was less affected...

The drought injury of rice plants of two varieties was compared at booting and bloomingstage with reference to the internal water relation of plant.When the plant of variety “ShengLi Xian”was exposed to soil drought at booting stage water content in the young earsignificantly decreased,growth and development of ear almost ceased until the flooded statehad been restored.While in the case of the plant of variety “Lao Lai Ching”,the young earwas somewhat well provided with water,so that its growth was less affected in the dryingcourse,yet the yield was in a considerable decrease due to a larger number of deformedspikelets occurring on panicles.The major cause of drought injury at blooming stage,on thecontrary,was considered to be the desiccation of ear proper.Since the ear of “Lao Lai Ching”maintained higher level of water content under drought condition,this variety is stronger inresistance to drought at blooming stage than “Sheng Li Xian”.From the results of experi-ment it is clear that the redistribution of water in plant is one of the adaptative response ofplant to drought,and the regulation of the rate of growth and development of organs is aneffective form to endure dryness.

本文比较了两个水稻品种在孕穗期和开花期的旱害,并联系株内的水分状况的改变来说明品种差异的原因。从本试验结果可看出体内水分的重新分配是植株对干旱的适应反应之一,器官生长发育速度的调节是抗旱的一个有效方式。

Four different types of cytoplasmic male sterility in maize were tested for their identityby use of the restoration technique.Male-sterile lines incorporated with cytoplasm of theTexas source were found to be completely affected in crosses by a group of restorers includ-ing W153,W28 and G32,and partially restored by W24,M14 and A34.This made a figure of6 restorers out of about 60 inbreds thus tested in the Texas cytoplasm.Inbreds W153 wasselected as a differential restorer for T-type steriles since it gave no...

Four different types of cytoplasmic male sterility in maize were tested for their identityby use of the restoration technique.Male-sterile lines incorporated with cytoplasm of theTexas source were found to be completely affected in crosses by a group of restorers includ-ing W153,W28 and G32,and partially restored by W24,M14 and A34.This made a figure of6 restorers out of about 60 inbreds thus tested in the Texas cytoplasm.Inbreds W153 wasselected as a differential restorer for T-type steriles since it gave no reactions to the othertypes.For the Moldavia type of male sterility,formerly offered by Prof.Hadjinov,we founda partially restoring inbred W9 to be better suited for the similar purpose.The third andfourth type of male sterility,designated as B- and G-type,came through our own selectionsfrom two Bulgarian varieties.Separation between them seemed difficult.Since A374 gavepartial pollen fertility to the B-type steriles exclusively,it could be used as a differentiat orfor this type of cytoplasm.Pollen restoration in crosses involving W153 and W28 followed the expectation based ona dominant Mendelian gene.However,data obtained from segregating progenies of doublecrosses in which G32 was the restorer suggested strongly that two dominant complementarygenes were more workable.The difference in genotype of inbreds concerned in variousinvestigations seemed to be responsible for such inconsistent results.Segregating patterns in the Texas sterile crosses of the partial restorer,W24 or M14,varied with plants used as the pollen parent and with the date of planting.It appeared verylikely that W24 and M14 were heterozygous for major restorer genes since one sterile versionof W24 and four fully restoring lines of M14 had been established by conversion and test-cross-ing respectively.Dominant modifiers might also be present in either of the inbred popula-tions.In the presence of Moldavian cytoplasm the recessive allele of the restorer gene seemedto exert an abortive action to its pollen carriers produced by the heterozygote.When plantsheterozygous for the restorer gone were outcrossed to male steriles carrying the right cyto-plasm,all plants from the progenies proved to be pollen shedders.It was suggested that theM-type cytoplasm might be similar to that of S-type.Tentative genotypes related to pollen restoration of Texas male sterility had been workedout for a number of inbreds on the basis of two dominant complementary genes.Workingschemes for the production of double-cross seeds of maize without detasseling had been sum-marized and discussed by the authers.

三种细胞质遗传的玉米雄花不孕类型各有其专效的恢复系和部分恢复系。在 T 型细胞质基础上,测定出两对显性互补基因决定着花粉孕育性的恢复,同时还有显性修饰基因存在,影响其表现的程度。春播和夏播的不同环境条件只对部分恢复性的表现发生明显影响,对全恢复性和不孕性则很少能够改变。M 型恢复性的等位隐性基因在杂合株内对花粉粒具有某种致死或败育作用,故测交后代表现不分离现象。本文初步鉴定了若干常用自交系的 T 型恢复基因型,并以此作为根据,提出了配制全不去雄的玉米双交种的各种可能方案。

1. These materials were originated from three combinations which were crossed during 1960-1961. The Parental varieties used for this experiment were of two major types in production, i. e. Virginia type and Spanish types. There are significant differences in ecological and biological characteristics between these two types, and a number of favourite varieties have been obtained through intervarietal sexual crossing between these two types concerned.2. Being estimated and calculated by different methods...

1. These materials were originated from three combinations which were crossed during 1960-1961. The Parental varieties used for this experiment were of two major types in production, i. e. Virginia type and Spanish types. There are significant differences in ecological and biological characteristics between these two types, and a number of favourite varieties have been obtained through intervarietal sexual crossing between these two types concerned.2. Being estimated and calculated by different methods (Heritability in a broad sense method and parent-offspring correlation method), the heritability of all other characteristics of peanut, with exception of that of total branches and total fruiting shoots which appear relatively different, tends to be more or less the same.The characteristic-heritability of 100 pod weight, number of mature pods, number of fruit-setting per plant, days of breeding and height of main stem behaves higher, while that of number of immature pods and yield of pods per plant behaves lower.3. Realizing that the heritability of yield per plant for generations (F2-3) appears pretty weak, the selection of this characteristic is not advisable to be too much restricted by the selecting standard, especially in case the combination of which the bi-parental ecotypes are greatly diverse, to lower the standard is most necessary. This characteristic through direct selection in F2 will be of no effect. However, there are some other characteristics which are closely related with the yield of pods per plant such as number of fruit setting and number of mature pods per plant. Through selection of these indirect characteristics, to select and raise improved strains of high productivity per plant is possible.4. The correlation between yield and other characteristics indicates that the more the number of fruit setting and of mature pods the more will be the yield; and this correlation is in a sense suggesting that the fruitfulness and good maturity are essential determining factors of yield.5. To estimate and calculate heritability in a broad sense by using the square of C. V. (coefficient of variation) instead of corresponding variance can be of advantageous in correction to a certain extent.

1.材料为1960~1961年杂交的三个组合。选用的亲本,为生产应用的两个主要类型(普通型、珍珠豆型)。这两个类型的品种,在生态和生物学特性上都有比较明显的区别。采用这两个类型进行品种间有性杂交,选出的优良品种也较多。 2.花生性状遗传力的大小,在不同的估算方法(广义法及上下代亲子相关法)间,除总分枝、总果枝出入较大外,其他几个性状都有大体一致的趋势。百果重、饱果数、单株结果数、生育日数、主茎高等性状遗传力较高,秕果数、单株产量等性状的遗传力较低。 3.单株产量,从世代间(F_(2-3))的遗传力来看是很弱的,因此,对于单株产量的选拔标准不宜控制过严,特别是双亲生态型相差悬殊的组合,更有必要放宽选拔的标准。此性状于第二代通过直接选择是无效的,但与单株产量有密切关系的却有几个性状,如单株结果数、饱果数等。因此,通过间接性状的选择,亦可能选择出单株生产力高的优良品系。 4.产量与其他性状的相关性表明,单株结果数越多,产量越高,饱果数越多,产量越高,说明果多果饱是决定产量高低的主要因素。 5.利用变异系数的平方代替相应的变量来估算广义遗传力,可以起到一定的矫正作用。

 
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