查询词典 microspore

In succession, the middle layer of anther wall had the strongest Ca^2＋ fluorescence intensity, and the tapetum took second place during the meiosis of microspore mother cell.

小孢子内Ca^2＋分布不均匀，细胞质中的Ca^2＋荧光较弱，细胞壁处Ca^2＋荧光较强，二细胞花粉时期，细胞呈现较强的Ca^2＋荧光。

ATPase precipitates were present in the microspore cell during the early tetrad stage.

四分体早期的小孢子细胞质中开始出现ATPase反应颗粒。

From tetrad stage to microspore stage, the ABA content in sterile buds was higher than fertile buds.

四分体到小孢子单核期和小孢子二核后期至成熟花粉期不育花蕾ABA含量仍高于可育花蕾。

The results showed that pepper's microspore develped at three stages: tetrad, uninucleate, and binucleate, and each stage demonstrated distinctive characteristics.

结果表明，辣椒小孢子发育经四分体时期、单核期和双核期，各时期特征明显。

Osg6B, a promoter from rice, can direct gene expressing in anther tapetal during the early developmental stage of microspore from tetrad to uninucleate pollen, with high temporal and spatial specificity.

osg6B是来源于水稻花药绒毡层的特异性的启动子，它在小孢子发育的四分体时期至单核花粉期在花药绒毡层中特异启动基因的表达，它具有较为严紧的时空特异性。

There are three copies of R fragment in the S mt-genome, and each copy contains two closely adjacent open reading frames: orf355 and orf77. Among these three copies two BamHI fragments were cloned, and the sequence analysis showed that cox1 and cox2 gene lies upstream of the R region in each fragment, respectively. However, they locate in different strands and head to head with R. In this study, we found that:(1) The expression of cox1 and cox2 is not affected by the transcription of R region;(2) The two copies of R region transcribe in large amount in the microspores, and produce transcripts of 1.6kb and 2.8kb, respectively, in the sterile microspores; However, the abundance of these two transcripts is reduced in the fertility restored microspores, realized through the mRNA decay, and this reduction occurs at the uninucleate microspore stage;(3) In the sterile microspores, the 5 terminus of the 1.6kb transcript contains a palindrome region that can fold into a stem-loop.

本研究发现：(1) cox1和cox2的转录没有受到R区转录的影响；(2)两个拷贝的R区在在不育花粉中高丰度表达，其转录本大小分别为1.6kb和2.8kb；而在育性恢复的花粉中，这两个转录本的丰度被大大降低，进一步分析表明这一结果是通过mRNA分子的降解途径来实现的，此降解过程发生在单核花粉期；(3)在不育花粉中，1.6kb转录本的5′末端具有一段可形成茎环结构的迴文对称序列，而在可育花粉中，其5′末端短缺了9个碱基；(4)在不育花粉和育性恢复的花粉中，R区转录本的加尾位点都集中位于一个3′茎环结构之后；(5)不管是在不育花粉还是育性恢复的花粉中，orf77区域内均在第52位和100位核苷酸处发生了不同频率的C向U的编辑，从而形成UGA终止密码；(6)不管是orf55-orf77的成熟转录本还是转录前体分子，都已被加上了Poly尾巴，表明已进入降解途径；在以上实验结果的基础上，本研究对S型CMS花粉育性的恢复机理进行了如下推测：在不育花粉和育性恢复的花粉中，orf77区域内均发生了终止编辑，即由RNA编辑产生了提前终止密码子。

GA(subscript 1+4) distribution in microspore mother cells, uninucleate and binucleate pollen, especially in nucleus, gradually increased with the anther development. Moreover, some GA(subscript 1+4) distributed in sperms.

短日照条件下花药可育，花粉母细胞、单核花粉和二核花粉内GA(下标 1+4)的分布数量逐浙增多，以细胞核最为明显；成熟花粉的精细胞内也有一定数量的GA(下标 1+4)分布。

Microspore abortion of H9A occurred in the early uninucleate stage. The tapetum cells were in extreme hypertrophy so that tetrads were extruded to crack and break down and could not form normal uninucleate pollen grains; the abortion type was sporophyte.

结果表明，雄性不育材料H9A的小孢子败育发生在单核前期，由于绒毡层细胞极度膨胀，四分体受挤压后破裂并降解，无法形成正常的单核花粉粒，属于孢子体败育。

By the method of in situ hybridization, the distribution of mRNA of RSG6 was detected. The result showed that the transcript activity began at the late unicellular stage microspore, increased at the bicellular pollen, and was most vigorous at the two sperm cells in mature pollen.

用地高辛RNA标记试剂盒，采用体外转录方法标记RSG6基因的cDNA序列中长度为258bp的一段作为反义RNA探针，运用RNA原位杂交技术，探讨了RSG6基因的mRNA在水稻根、茎、叶以及花药发育各阶段组织中的分布情况。

Compared with different type male-sterile line found at binucleate microspore stage non-1B/ 1R type male sterile lines and YS type male sterile lines both increase l7kD polypeptide compared with maintainers.

同时通过对比不同类型的不育系发现非1B/1R类K型不育系732A和YS光温敏不育小麦A3017在小穗发育的二核期均多1条分子量大小为17kD的多肽。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。