不育

Its utilization potential is more powerful in the breeding of recurrent-selection, cross, backcross and multiple-cross.

探讨了单显性核不育的利用方法和途径，单基因显性核不育在轮回选择、杂交、回交和复交育种中有一定的利用价值。

The approaches for decreasing the gene flow include chloroplast transformation, pollen sterility, seed sterility, cleistogamy, apomixis, temporal control, and transgenic mitigation.

目前降低外源基因扩散的方法主要有叶绿体转化、花粉不育、种子不育、闭花受精、无融合生殖、暂时性控制及转基因缓和等。

In order to get rid of the influence of cross-sterility caused by hybrization between indica and japonica, F2 population between zhenqiuB and 6078 was studied.

为了排除籼粳杂种不育可能对雄性不育性遗传的影响，本研究还配制了真秋B／6078的F_2群体。

More calcium precipitates were located in the epidermis, endothecium and tapetum of the sterile anther than in those of the fertile anther. Longitudinal inner cell wall of the sterile anther became thicker than that of the fertile anther at the dyad stage and uninucleate pollen stage.

到四分体与单细胞花粉时期，不育花药的木质部细胞的次生加厚壁上有较多的Ca2+沉淀，连接组织中的Ca2+沉淀也大大增加，所有不育花粉外壁较厚而发育都不正常。

2The mother cells of macrospore and microspore directly go mitosis by-passed meiosis to form normally fertility gametes.

分析其主要原因在于：①雌配子不育；②雄配子不育；③雌雄配子之间的亲和性障碍；④雌雄配子发育不同步；⑤单受精。

The results showed that the cell wall organization during anther development failed to divide into inner-wall, middle and tapetum normally, and not to provide material, energy and information transfer for the development of pollen mother cells, resulting in the occurrence of abnormal pollen mother cells separatist period; thus which could not form a normal pollen grains which led to abortion.

结果表明，不育花药壁组织在发育过程中，没有分化形成正常的内壁、中层及绒毡层，不能为花粉母细胞的发育提供物质、能量和信息的传递，造成花粉母细胞在减数分裂期发生异常，不能形成正常的四分体，因而未能形成正常的花粉粒而导致败育。

Ms-yanshi 9^ ms-80 (6) and ms-90-110, were selected as the materials in the study on gene location of B -type cytoplasmic male sterile lines by using monisomic analysis and nullisomic -tetrasomic analysis methods.

结果表明：二角型不育系主效恢复基因只有一对，位于ChrislB染色体上，在旧染色体以外，不存在二角型不育系的主效恢复基因。

Deduced by the proportion of typical sterile plants and normal fertile plants in segregative generations derived from WA zhenqiuA/6078 that:I gene could inhibit the expression of Rf gene completely by the heterozygosity of 1 pair of Rf in genotype;and only reduce the expression of Rf genes with two heterozygous Rf genes in genotype ;but it would never inhibit the expression of Rf genes if the genotype included 3 pairs of heterozygous Rf genes. When Rf gene was homozygous,the / gene could not inhibit the expression of it.

根据认叭真秋刀6078各衍生分离世代中典型不育株和正常可育株所占比例推断：基因型中仅包含1对杂合的Rf基因时，I对Rf的表达起完全抑制作用；基因型中包含2对杂合的Rf基因时，I仅对Rf的表达起削弱作用；当基因型中包含3对杂合的对基因时，I对Rf的表达不起抑制作用；I对纯合位点的Rf的表达不起抑制作用。

The result showed that in the condition of high temperature, there existed obvious difference among the tassels' fertility of these maize materials. Their sterility showed there were no pollen grains, anther could not be shedded, and anther couldn't shed pollen.

结果表明，高温条件下，材料间的雄花育性存在着明显的差异；不育性表现方式有：无花粉粒、花药吐不出、花药不散粉。

The corolla of the 235A degenerated and most of its shrivelling stamen had incompletely developed anther and stigma.A few fertile pollens in one or two completly developed stamen were not emerged because anthers were closed by much longer calyx.

研究表明，新发现的辣椒雄性不育花冠退化，大部分雄蕊萎缩、没有花丝、具发育不完整的花药；虽然花内1～2枚发育正常的雄蕊有少量可育花粉，但由于花萼畸长紧闭，不能开花。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐