四体

So, the abnormality of embryo sac was one of the factors that induce low seed setting percentage in autotetraploid rice.

从对13个品种的成熟胚囊育性调查的结果来看，同源四倍体水稻胚囊育性是影响其结实率的原因之一。

The autotetraploid gives a chance to improve the content of medical materials in the root of P. thomsonii.

同源四倍体粉葛为葛根中药用物质质量分数的提高提供了基础。

Biological effects of autotetraploid rice after ion beam implantation of low energy N+ were studied.

以低能氮离子束为诱变源，对同源四倍体水稻进行注入处理后，对其生物学效应进行了研究。

The autotetraploid plant of sesame may be effectively induced by immersing seeds with 0.3%-0.5%colchicine water solution under 28 ℃ for 24 hours.

在28 ℃的条件下，用0.3%～0.5%的秋水仙素水溶液浸种24 h，诱发产生芝麻同源四倍体的效果较好。

The meiosis observation demonstrated the genomes of our autotetraploid materials were all 2n = 48, the same as those in mitosis observation.

所有四倍体材料的染色体组成均为2n = 48，这与有丝分裂的结果一致。

Embryo development and origin of twin-embryo of autotetraploid rice with twin-embryo seedlings were observed and verified.

利用激光扫描共聚焦显微技术对同源四倍体双胚苗水稻的受精过程、胚胎发育过程和双胚来源进行观察鉴定。

Biological effects of autotetraploid rice after ion beam implantation of low energy N+.

低能氮离子注入同源四倍体水稻的生物学效应。

From 1996 to 2005, someautotetraploid rice had been selected and improved. T-test showed that seed setincreased obviously. The relationships among yield characters of autotetraploid ricewere analyzed.

从1996年到2005年对部分同源四倍体水稻进行了连续选择改良，T检验表明经过9年的选择改良，其结实率显著提高。

It is suggested that autotetraploidy rices are better females in the distant hybridization due to the fact that they are weaker in sexually reproductive ability.

结果暗示由于同源四倍体水稻具有比较弱的有性生殖能力，在远缘杂交中它们是比较好的杂交母本。

The most ellipse 4- wing rotor s installed in Banbury mixer are used popularly in the large size of tire factories of China, the working part of rotor is spiral wing body shape and its structure affects the quality of compound and the productivity directly.

我国大型轮胎厂普遍使用的本伯里型密炼机上转子均为椭圆形四棱转子，转子的工作部分螺旋棱体形状及其结构直接影响炼胶质量和生产效率。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。