杂种优势的

The contribution of the 5 main factors to total variation of population studied accounted for 86.84%.

遗传距离与杂种优势的关系较为复杂，并非遗传距离越大杂种优势越明显。

This work dealt with formation mechanism of heterosis of cocoon quality characters bymeans of physiological,biochemical and biometrical techniques for the purpose to providetheory guidance for adequate and predicatable application of heterosis.

本研究用生理生化及生物数学的分析方法，探索家蚕茧质性状杂种优势的产生机理，以期为生产上合理地、有预见地利用杂种优势提供理论指导。

On the basis of DDRT-PCR technique we found that:Total of 331 differential displayed cDNA bands from 1161 were displayed in the 4x4 diallel cross combinations with 30 pairs of primers, which shows the differences of gene expression between hybrids and their parental lines were very obvious in quantity and quality.

采用mRNA差异显示技术和荧光定量反转录PCR技术，从随机mRNA差异显示和候选功能基因mRNA表达定量分析两个方面，研究了32周龄杂种鸡及其亲本纯种的基因差异表达及其与繁殖性状杂种优势的关系，探讨了鸡繁殖性状杂种优势形成的因素及其分子遗传机理。

The main results are as followings:1 Molecular mechanism analysis of the rice heterosis by functional genomics method.1.1 In five gene chips, 845 genes that are discrepantly expressed were found.

研究结果如下： 1 运用基因芯片对水稻杂种优势分子机理的解析： 1.1 5张基因芯片检测出845个差异表达基因，涉及多种植物功能，表明杂种优势的表现与多种代谢途径相关。

These genes are related to many plant functions, indicating that the heterosis was related with many metabolization pathways.1.2 The quantity of discrepant genes showed that the genetic discrepancy was notalways the same with the discrepancy of expressed genes, indicating that small-scale genetic discrepancy maybe result in large-scale genes discrepantly expression; in other way, some genetic discrepancies might not embodied on the discrepant genes in the experiment.1.3 Nine and eight discrepant genes were found respectively in the superior bulkand minor bulk in the dominant level.

1.2 各张芯片差异表达基因数量表明遗传差异与表达谱差异不尽一致，可能较小的遗传差异可以造成表达谱的巨大改变，而有些遗传变异可能没有在表达谱上表现出来。 1.3 从优势集团和负优势集团中分别找到9个和8个具显性表达水平的差异表达基因，研究表明显性表达水平的差异表达基因的聚合与杂种优势的表现没有相关性。

But to make good use of them, their genetic characteristics and germplasm relationship with Chinese inbred lines representing different heterotic groups should be studied.

本研究采用传统的配合力和杂种优势分析与现代的SSR分子标记技术相结合的方法，探讨引进南斯拉夫玉米自交系与我国不同优势类群骨干自交系的配合力、杂种优势、遗传距离和杂合性，为引进自交系的高效合理利用提供理论依据；并通过各项遗传指标与F1产量的相关分析，探讨各项指标预测杂种优势的可行性和效果。

In this study, through the traditional methods, analysis of combining ability and heterosis, and modern SSR marker technique, the combining ability, heterosis, genetic distance and heterozygosity between introduced Yugoslavia inbreds and important lines representing different heterotic groups in our country were studied, which will greatly influence to make full use of those indroduced lines.

本研究采用传统的配合力和杂种优势分析与现代的SSR分子标记技术相结合的方法，探讨引进南斯拉夫玉米自交系与我国不同优势类群骨干自交系的配合力、杂种优势、遗传距离和杂合性，为引进自交系的高效合理利用提供理论依据；并通过各项遗传指标与F1产量的相关分析，探讨各项指标预测杂种优势的可行性和效果。

The obvious heterosis was shown in eggplant(Solanum melongena L.). Production of hybrid seeds using male-sterility as female parent was a very important way in application of eggplant heterosis.

茄子有很强的杂种优势，利用雄性不育系做母本生产杂种一代是利用茄子杂种优势的重要途径之一。

Cornell plant breeder Steven Tanksley is a co-recipient of the international Wolf Foundation Prize in Agriculture.

他以识别水稻的野生种原的基因的方法对水稻杂种优势（利用这种杂交优势已显著地增加了产量）的理解做出贡献…… Tanksley的研究导致发现这种重要的粮食作物的杂种优势的遗传基础，这是为人类利益而促进农作物培植科学发展的一项意义深远的发现。

Further more, high-oilized normal corn could also be used as seed in high oil corn production.

因此，如何提高杂种优势的潜力，发展新的高产玉米生产系统成为玉米育种的重要课提高玉米杂种优势的途径主要有两种：一是继续提高自交系间杂种优势水平，对此国内外已多有研究；二是利用杂交种间优势，也就是通

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。