杂种优势

Information on the combining ability and heterotic patterns of maize germplasm is of great value to maize breeders.

研究玉米种质的遗传关系及其杂种优势模式对玉米育种者有着极为重要的指导意义。

The heterotic application in maize breeding makes a great contribution to increase maize production since 1960 in China.

从20世纪60年代以来，我国玉米的产量得到大幅度地提高，杂种优势的广泛利用发挥了决定性的作用。

In showed super dominant effect and dominant effect had main action in Sorghum × Sudan heterotic basis.

超显性效应和显性效应在高丹草杂种优势的遗传基础中占主导地位。

The objectives of this study were: 1 to assess the breeding potential of maize populations including 2 of tropical origin and 7 of temperate origin;2 to find a new heterotic pattern among the 9 populations.

评估2个热带群体和7个温带群体的育种价值，并在这些群体之间寻找新的杂种优势模式，为利用这些种质提供有用的科学信息。

In order to get high yield, the individual biomass and related factors (height, tillers and leaves number) were located on the chromosomes and analyzed genetic effect with QTLs. The heterotic vigor was discussed.

为提高育种中对牧草产量性状优良基因型选择的效率，对高丹草的单株产量及其构成因素进行QTL定位，确定其在染色体的位置及其遗传效应，探讨其杂种优势产生原因。

The six groups classified by cluster analysis of SSR markers is consistent with the available pedigree and the result of combining ability. So it is feasible to analyze the genetic diversity of maize population by SSR markers and to distinguish heterotic group by method of mixed sampling.

6个玉米群体的聚类结果与系谱来源和田间配合力测定结果基本一致，说明，用若干单株混合取样分析玉米群体SSR的遗传多样性，进而对不同玉米群体划分杂种优势类群是可行的。

The results showed that pingshandahuang, junlianxuesi and junliandabaimaya had greater potential trend, 13 landraces were divided into five primary heterotic groups.

结果表明：屏山大黄、筠连血丝和筠连大白马牙具有较大的利用潜势；13个地方种质可分为5个初级杂种优势群。

Clustering results showed that the clusters were not corresponding to heterotic groups and pedigrees,which suggested that the A-PAGE of seed storage proteins might not be a good method for large-scale analysis of genetic diversity and heterotic grouping in maize germplasm.

利用盐溶蛋白多态性完成的聚类分析结果和自交系系谱及杂种优势群之间没有明显的对应关系，表明储藏蛋白A-PAGE方法对于大规模玉米种质资源的遗传多样性分析和类群划分可能存在局限性。

Huangzaosi inbred lines(Huangzaosi and its derived lines) is recognized as one of five heterotic groups by maize breeding in China. It has characters of high combining ability, ideal plant type, drought and barrent tolerance, wide adaptation and so on.

黄早四种群自交系是我国玉米育种的五大骨干杂种优势类群之一，建立在黄早四及其改良的衍生系基础之上，具有配合力高、株型好、耐旱耐瘠、适应性广等特点。

Study on the genetic characteristic of improved lines which can broad temperate maize genetic basis, found new heterotic patterns, resolve the back and force situation, overcome the obstacle of high and super- high yield breeding, provide the technique guarantee for the sustainable development of Chinese maize production.

对改良系进行遗传研究，拓宽温带玉米的遗传基础，构建新的杂种优势模式，这将解决我国玉米育种徘徊不前的局面，克服玉米高产超高产育种的障碍，为我国玉米生产的可持续发展提供技术保障。

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％。