杂种优势

Heterosis making use of the male sterile breeding be able to save large amount of emasculation labour,ensuring that seed purity.It is possible that breeding can be solved while the trend of single tea varieties and genetic breeding the problem of insufficient resources.

利用雄性不育育种可以节约大量母本去雄的劳力，保证种子纯度，充分发挥杂种优势，同时可以解决育种中存在的茶树品种趋向单一化和遗传育种资源不足的问题。

However, We think that heterosis is caused by the complex effects of dominance, over-dominance and epistasis.

作者认为，杂种优势的产生是显性效应，超显性效应和上位性效应共同作用的结果，不可能只是一种基因效应在起作用。

Finally,the information about QTLs and epistasis in the population provide strategiesfor manipulation of heterosis and improvement in hybrid rice.

最后，本文就上位性效应对杂种优势遗传研究和杂交水稻遗传改良的影响进行了讨论。

Furthermore, it was indicated that epistasis was the main genetic dynamics of speciation and adaption and the primary genetic component of heterosis and complex traits.

遗传物质间上位性是物种分化和适应的重要遗传学动力，也是复杂性状和杂种优势形成的重要遗传组分。

Finally this paper has looked forward to the direction of heterosis.

最后对杂种优势研究的未来发展方向进行了展望。

Heterosis has been widely used in agriculture, and the analysis of its molecular mechanism is always the hot question.

杂种优势在农业中得到了广泛的应用，其分子机理的解析一直是热点问题。

Heterosis in cotton is noticeable and has been widely used in cotton production.

棉花的杂种优势明显，已在生产上广泛利用。

So,it isimpoortant to predict and evaluate the heterosis in theory and practice.

在肉牛生产中，杂交是获得最大产出率的手段之一，因而预测和评估杂种优势在理论和实践上均具有很大意义。

The study of plant male sterility plays an important role on utilization of heterosis.

雄性不育的研究对于杂种优势的利用具有重要意义。

The results obtained in this study will be helpful for further elucidating mechanism of heterosis.

这为进一步深入探讨杂种优势形成机理奠定了一定的基础。

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％。