杂交育种

Systemic selection is an effective method for wheat (Triticum aestivum L.) breeding.

系统选择是新品种选育的有效方法，也是修饰育种的重要途径，群体内剩余变异和天然杂交是系统选择的来源基础。

The HMW-GS genetic analysis of 18 hybridized F1 and F2 and backcrossed BC1F1 and BC1F11 by using SDS-PAGE method shows:(1) The band patterns of HMW-GS, having the genetic characteristics of variety stability, were genetically controlled but not affected by environmental factors.

Glu-1位点上的HMW-GS变异对蛋白质含量的影响不显著，蛋白质含量的多少受HMW-GS等位变异的影响较小。在小麦品质育种过程当中，通过改变HMW-GS组成的方式来提高杂交后代的蛋白质含量是不可取的。

Using plant AT-1found by kenaf breeding research group of institute of bast fiber crops Chinese academy of agricultural sciences in Sanya of Hainan province were used as female parent in crossing with 15-4, 04K1 and then backcrossed four times with male parent in order to select two high sterile male sterility.

利用中国农业科学院麻类研究所红麻育种课题组在海南三亚发现的红麻不育株AT-1做母本分别与15-4，04K1做杂交，再用父本回交4次，选育出2个高度不育的不育系。

These single-copy transformants could be used for the culture of resistance-herbicide and also produce new variety through backcrossing and crossing.

这些材料可直接生产杭除草剂杂交种，也可作为抗除草剂的种质资源，通过杂交、回交等常规育种方法将抗除草剂Bar基因导入目标品种，获得具有抗除草剂特性的新品种。

Based on the results of information investigation, the paper briefly summarizes the research and application of cell engineering technology in agriculture: Chromosome engineering,protoplast culture,anther culture, cell culture, tissue culture and somatic hybridization. The worldwide development and progress in the application of cell engineering in plant breeding are reviewed.

根据文献研究结果，系统地综述了染色体工程技术、原生质体培养、花药培养、细胞培养与无性系筛选、组织培养与体系胞杂交等细胞工程技术，在国内外农作物育种上开发应用后所取得的新进展、新成果，以及这些新成果的产业化，对促进中国农业生产的发展所起的作用。

The main breeding methods of triploid grape such as crossing between diploid and tetraploid cultivars, endosperm culture, using 2n gametes and bud mutation etc.

探讨了三倍体葡萄育种的主要途径如利用二倍体和四倍体杂交、胚乳培养、利用2n配子和芽变选择等。

This item is mainly carry on close origin of original grow at first then further and purely expand big area through cross-fertilize to make technique research and extend a new product in order to do experiment demonstration and popularization.

项目简介：采用国内外第一项&瓜果超低温育种&的成功技术，选育性状稳定的两个亲本杂交，选育出杂种优势强的籽用南瓜新品种。

The results at molecular level provided a feasible research foundation for germ plasma identification, genetic diversity analysis and hybrid parents selection in rice breeding.

这些DNA分子水平的结果可为水稻种质资源的鉴定、遗传多样性分析和水稻育种工作中杂交亲本的选择提供科学依据。

It is a good sterile line for breeding of quality hybrid rape varieties with yellow peel.

是开展黄籽优质杂交油菜育种的优良不育系。

The discovery of PGMR Nongken 58S provide a new approach to two line hybrid rice breeding.

光敏核不育水稻农垦58S的发现为杂交水稻开辟了新的育种和利用途径。

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％。