查询词典 microspore

In vitro anther culture, experience shows that, in order to enhance the induction of regeneration, it is important to select appropriate developmental stage microspore vaccination.

花药离体培养的经验证明，为了提高再生植株的诱导率，必须选择发育时期适宜的小孢子接种。

The influence factors to microspore embryogenesis of non-heading Chinese cabbage were studied through seventeen genotypes.

以17个不同基因型的不结球白菜为供试材料，对影响小孢子胚胎发生频率的若干因素进行了研究。

Cytological observation was made,which indicated that microspore degeneration was a successive process.

比较研究了可育花及两种类型的不育花小孢子发育的细胞形态学特征，发现萝卜小孢子败育是个连续过程，在造孢细胞时期就已出现败育迹象。

In L. davidii, the male plastids were stripped off during the division of microspore.

在生殖细胞的发育过程中，质体发生解体，到成熟花粉的生殖细胞只含线粒体，没有质体。

It was proved by ultrastructure observations that male plastid excluded during microspore mitosis.

超微结构的研究证明了菜豆雄性质体在小孢子分裂时被排除，质体全部分布在营养细胞中，初形成的生殖细胞已不含质体。

The RGCMSplants in RGCMS-117A or S45A were complete male sterile at the bothtemperature conditions,and there was no pollen sac differentiation at thehigher temperature condition and there were 1-3 pollen sacs in each anther atthe lower temperature condition,but the anther development was inhibited atthe stage of microspore.

表现核质不育的植株，在高温条件下表现彻底波里马细胞质雄性不育，无花粉囊分化；在低温条件下，也表现彻底雄性不育，具核、质不育的共同特点，每个花药可分化出1-3个花粉囊，但无可育花粉，其雄性败育时期和特点与S45A和117A相同。

Puna Chicory, leymus multicaulis and Psathyrostachysjuncea.For the materials used in this article were some old seeds which had been stored for 3-7 years, we found a lot of abnormal mitotic and meiotic cells, such as chromosome bridge. chromosome laggard, micronucleus, multipolar division and so on. Moreover, we also found the wheat"s multi-anther, double germinate-hole"s microspore and collected the photos of every period of meiosis. mitosis.

因为用于细胞学检测的小麦材料是搁置多年的陈旧种子，所以在检测染色体数目时，发现大量异常分裂现象，包括染色体桥、染色体落后、微核、多极分裂等；实验过程中还发现小麦多花药现象和花粉粒具双萌发孔的现象；同时在显微观察同时还注意搜集了细胞有丝分裂、减数分裂各个时期的分裂相图片。

F1 hybrid has the morphological feature which is between the male and female parents and shoed strong heterosis, exuberant vitality, late ripe period and low rate of self-fertility. The average chromosome configuration of F1 in PMC MI was 18.58Ⅰ+18.59Ⅱ+0.085Ⅲ+0.028Ⅳ. At anphase Ⅰ in PMC, some laggard chromosomes arranged in equatorial plate. Micronucleus and a lot of abnormal cells can be observed at dyad, tetrad and microspore.

杂种F1形态特征介于双亲之间，具有较强的杂种优势，生长旺盛，熟期晚，自交结实率较低。F1花粉母细胞减数分裂中期Ⅰ平均染色体构型为18.58Ⅰ+18.59Ⅱ+0.085Ⅲ+0.028Ⅳ，PMC后期Ⅰ观察到部分落后染色体排列在赤道板上；二分体、四分体和小孢子时期，细胞内普遍观察到微核，且出现大量异形细胞。

Microspore Ye as the feather, small sporophyll sac formed by the polymerization, each polymer capsules formed by four small sporangia, small spores with dual airbags, and airbag Pinaceae pollen is similar to large sporophyll from the central axis and arranged in Brachypodium feather composition, Each Yibing has a shell bucket, each bucket containing shell upright ovules 10-12 months.

小孢子叶枝为羽状，小孢子叶由聚合囊组成，每个聚合囊由4个小孢子囊组成，小孢子具双气囊，与松科植物花粉的气囊相似，大孢子叶由中轴及羽状排列的短柄组成，每一柄上有一个壳斗，每个壳斗内有10—12个直立的胚珠。

Histological study indicated that low temperature inhibited microspore formation and caused abnormal multiplication of tapetum layer cells.

经切片观察，低温会造成绒毡层细胞的异常增殖，及产生多核性巨大小孢子，而阻止小孢子发育。

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。