杂种优势的

Genetically engineered male sterility is one of the important methods to better use heterosis in crops.

利用基因工程创造雄性不育是更广泛地利用作物杂种优势的重要途径之一。

Besides, the relationship between〓expression of maize and heterosis were analysed by means of cDNA-AFLP technique.

并且利用cDNA-AFLP技术探讨了玉米基因表达与杂种优势的关系。

These results showed that there were closely relationship between differential expression genes and heterosis at seedling stageof cotton.

上述结果表明，苗期基因表达差异与杂种优势的形成存在着密切关系。

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。

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。

Based on the Liriodendron interspecies hybridization study by professor Ye Peizhong,according to the satisfying and exact mating system and field design,the reciprocal cross with extensive genetic background of Liriodendron tulipifera Linn., the backcross and F 1 crossing which had never been made, and the genetic analysis of heterosis of the hybrid tulip tree were carried out.

在叶培忠先生的鹅掌楸属种间杂交育种研究基础上按遗传设计与环境设计开展了扩大北美鹅掌楸遗传基础条件下的正反交以及前人从未做过的回交和F1 间杂交，并进行了杂种马褂木杂种优势的遗传分析。

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。

Chromosome observation of the male sterile line and fertile line, parents of hybrid combination and F1 indicated that the chromosome number of the male sterile line is the same as that of fertile line 2n=2x=24; Pollen parent (Tagetes putula PHBO029) is tetraploid 2n=4x=48; the F1 is triploid 2n=3x=36 with hybrid vigor.

通过对不育系、正常可育系以及杂交组合父母本、子一代的染色体数目观察发现：万寿菊雄性不育系的染色体数目与正常可育系相同，均为2n=2x=24；孔雀草PHBO029为四倍体2n=4x=48，它与万寿菊不育系杂交、其杂种为具有杂种优势的三倍体2n=3x=36。

He not only is our country hybrid rice research founder, also is the our country hybrid rice research chief designer and the most main leaders in a scholarly field. In 1986 he proposed the hybrid rice breeding from three is the law to two is the law to one is the law and uses three development phases from the variety to the subspecies to 远缘杂种 the superiority the strategic tentative plan, this tentative plan has become the domestic and foreign recognitions hybrid rice breeding the guiding ideology.

他不仅是我国杂交水稻研究的开创者，也是我国杂交水稻研究的总设计师和最主要的学术带头人。1986年他提出杂交水稻育种由三系法到两系法到一系法和从品种间到亚种间到远缘杂种优势利用三个发展阶段的战略设想，这一设想已成为国内外公认杂交水稻育种的指导思想。1987年两系法杂交水稻技术被列为国家&863&计划的重点课题。

The superdominance effect and the dominance effect took the main function in the genetic basis of heterois of sorghum x sudan grass.

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有主导地位。

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％。