杂种优势

While doing the RFLP tagging of giant embryogene,the genome changebetween mutants and its original parent,the relationship between RFLP andheteroses in indica,japonica and intermediate rice,the performance of multipleand null allelism in rice varieties,the utilization of null allelic RFLP probes inidentifying indica and japonica rice specifically,the distribution of the nullallelic RFLP probe RG684 in rice cultivars,and the segregations of RFLPmakers in indica/japonica F2 population were also studied.

本实验从经典遗传、分子遗传、育种潜力评估、育种新品系选育等领域，对巨大胚、甜胚乳、暗胚乳三种新型突变体进行了全面系统研究。在对巨大胚进行分子定位过程中，对涉及到的突变体与原始亲本基因组变化，籼、粳、中间型材料的RFLP多态性与杂种优势之间关系，水稻品种的复等位、零等位表现，鉴定籼、粳特异性的零等位RFLP标记，零等位标记RG684在稻种中分布，RFLP标记在籼粳交F2群体中分离等遗传现象也一并进行了分析。

It was suggested that the capacities of parthenogenesis and apogamy of rice were used to obtain stable lines in early hybrid generations.And several characteristics such as apomixis,cleistogamy,superior genes of qualities and resistance to disease and pest were combined and were used to search a new pathway of selecting high yield,superior quality and heteroresistance to diseases and pest,and lead to realize the purpose of fixing heterosis by apomixis.

利用水稻的孤雌生殖和无配子生殖能力，获得早世代稳定品系，建立快速育种方法，把无融合生殖特性与闭颖授粉、优质、抗性等特性结合探索高产优质多抗育种新途径，逐步实现利用无融合生殖固定杂种优势的目的。2。

But utilization of apomixis in breeding procedure could significantly shorten time of selection and fix heterosis.

然而利用无融合生殖特性进行育种将可能大大缩短育种年限，固定杂种优势。

This paper discussed the sorghum apomixis type, occur mechanisms, genetic research and breeding prospects and for the eventual realization of sorghum heterosis fixing provides a theoretical basis and a reference for the study of other crops.

论述了高粱无融合生殖类型、发生机制、遗传研究及其育种前景，为最终实现高粱杂种优势固定提供理论依据，也为其他作物研究提供借鉴。

Therefore, the use of apomixis also holds great promise as an essential tool for plants sustainable agricultural production and economic crops improvement in the 21 century.

无融合生殖在作物育种上之贡献为能迅速稳定杂种优势并降低杂交种子的生产成本，得以在 21 世纪应用无融合生殖於农业和经济作物改良。

Apomixis provides a unique opportunity to fix and utilize hybrid vigor. A number of research programs around the world have tried to use apomixis as an important plant-breeding tool.

无融合生殖是指不经过雌雄配子融合而产生种子的一种特殊生殖方式，能使基因型的杂合性得以保持，从而可以固定杂种优势，对作物育种具有极其重要的意义。

Apomixis allows the establishment of genetically stable seed propagating clones of crops,which can perpetuate themselves across countless sporophytic generations.

利用植物无融合生殖固定杂种优势，已被认为是一条生产杂交种子的高效途径。近年来，由于RAPD、RFLP和差异显示等技术的应用，已使植物无融合生殖的研究面貌一新。

These results suggest that early seed development could be closely related to heterosis.

这些研究表明，在种子发育早期，基因的差异表达与杂种优势形成之间可能存在较为复杂的关系。

These results suggest that early seed development could be closely related with heterosis.

这些研究表明，在种子发育早期，基因的差异表达与杂种优势形成之间可能存在较为复杂的关系。

Some discussions on essence,occurrence and change of BPH biotype were also provided

此外，致害力的纯化速度缓慢，容易发生衰退，显示的是数量性状的特征和某种程度的杂种优势。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。