杂种优势

The results showed that there existed commonly the heterosis in crosses of pumpkin inbred lines.

结果表明，南瓜自交系的杂交后代普遍存在杂种优势。

Kenaf male sterility breeding gave a new method for the use of kenaf heterosis.

红麻不育系的选育为红麻杂种优势的利用提供了新的途径。

Nowadays, with the development of bio-technology, the basic study on kenaf male sterility will play an increasingly important role on the research of kenaf heterosis ultilization.

随着生物技术的迅速发展，红麻雄性不育基础科学研究，将在红麻杂种优势利用上发挥重要作用。

The legume used to be believed a species that its heterosis is difficult to be utilized in crop production.

豆科作物曾被认为是难于利用杂种优势的物种。

So,the genetic distance could be used for the choice ofparents and for the heterosis prediction in cross breeding of Liriodendron.

因此，花粉品质、杂交亲和力和一般配合力应作为亲本选配的重要依据；基于RAPD标记的亲本间遗传距离与子代1年生苗高和地径生长量均表现为二次曲线相关，复相关系数分别为0.8235和0.5090，达极显著(H，P＜0.01)和显著(GLD，P＜0.05)程度，说明利用亲本间遗传距离进行鹅掌楸亲本选配和杂种优势预测是可行的。

Cytoplasmic male sterility is a maternally inherited trait in which higher plants fails to produce functio...

细胞质雄性不育(Cytoplasmic male sterility，CMS)普遍存在于高等植物中，是生产上广泛利用杂种优势的基础。

Molecular systematics on germplasm resources of oak silkworm, Antheraea pernyi , including genetic diversity, cultivar taxonomy and microevolution within species, were investigated using Random Ampified Polymorphic DNA, mtDNA sequence analysis and population genetic analysis.

1.1.1 柞蚕的地理分布 20-211.1.2 柞蚕种质资源的收集、改良、保存和利用 21-231.1.3 柞蚕的滞育和化性 231.1.4 柞蚕的体色 23-241.1.5 柞蚕品种资源的系统分类 24-251.1.6 柞蚕杂种优势的利用研究 251.1.7 柞蚕的起源与传播 25-28

And the relationship between the closest factor related to yield and genetic distance was evaluated by partial correlation analysis.

最后将杂种优势中对产量影响最大的因子分别与RAPD及SSR标记的亲本间遗传距离进行偏相关分析。

Using the method of single factor variance,the SSR markers correlated with wood density,fibre length,fibre width and fibre angle were identified to be 5,7,4 and 2,respectively.

结果表明：纤维长有明显的杂种优势，控制该性状表现的基因之间具有正效应的互作；控制木材基本密度的基因之间具有负效应的互作。

Unstableness in the seed setting and filling is a major constraint in utilizing the heterosis of two-line intersubspecific hybrid rice.

结实率低而不稳是两系亚种间杂交稻杂种优势利用的一个主要障碍。

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％。