杂种优势的

Since microspore mother cells showabortion during the first meiotic divison,it is suggested thatthe early male abortion is frequently associated with variousdegrees of impairment to the fertility to the female〓amate.

研究的27个杂种第一代中，有11个组合的产量超过对照或与对照持平，占总组合数的40.74%。在强优势组合中，不育细胞质带来的负效应不足以使F1产量的显著降低，而且通过杂优补偿作用可比对照有所提高。

The results showed that there was a linear regression between F1 heterosis and the genetic differential index of its parents.

结果表明，杂种一代某些性状的优势率与其双亲间的遗传分化指数存在极显著的直线回归关系。

2N-6x-42are succeeded.Chinese Spring has very small ear,awnless,very narrow leaf blade;but hybrid has very big ear, short awn and filled grain,and leaf blade are very wide like Avena fatua L.

中国春穗较小，无芒，叶片较窄，而中国春与光稃野燕麦的杂种稳形较大，有短芒，籽粒饱满，且叶片宽大近似于野燕麦，表现优势很强。

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％。