查询词典 pollen

Occurrence of P-and C-tapetal cells is supposed to ensure sustainable supply with nutrients to pollen grains, and therefore contribute to cooperative complement of tapetal degeneration and pollen development.

绒毡层细胞以严格程序分批退化，保证了绒毡层向花粉提供养料的延续性，使得绒毡层退化与花粉发育2种相反的过程协同完成。

The results proposed that the abnormalities of microsporocytic cytoplasm or pollen exine, rather than the tapetal development caused the pollen abortion of Peiai 64S.

据此认为，培矮64S的花粉败育可能是由小孢子母细胞或花粉外壁的异常发育造成的，而不是由绒毡层发育引起的。

According to anther abortion characteristics and hormone functions, it was suggested that IAA, GA3 and ZR deficiency might be associated respectively with the inhibition of starch grain accumulation, pollen mother cell and tapetal cell expansion and tetrad formtion, and that abortion and even death of pollen mother cells and tapetal cells in sterile anther might be accelerated by high ABA accumulation.

根据内源激素的功能推测，不育花药IAA含量过低使花药淀粉积累受阻，GA_3含量不足影响花粉母细胞和绒毡层细胞的膨大，过低的ZR含量使花粉母细胞不能分裂形成四分体，过高的ABA含量促进花粉母细胞退化和死亡。

is that Tai Yu-D2 male sterile lines abortion occurs in monokaryon stage, the tapetal expanding abnormally occurs in dyadphase stage, pollen aborts completely, is a type of no pollen.

泰玉D2不育系花药绒粘层在二分体时期成辐射状膨大，小孢子在单核期败育，花粉败育完全，属无花粉类型。

It is tentative investigated the transferring of mitochondria by microinjection. It is found that the key of the success of transferring of mitochondria by microinjection is not the microinjected from pollen grain trema, but the cultivated of the microinjected pollen grain.

对显微注射转移植物线粒体的技术进行了探索性研究，结果表明，该技术的难点不在通过花粉粒萌发孔进行mtDNA的显微注射，而在注射后花粉粒的培养。

Using calcein as an indicator, the effects of electroporation on de exined pollen, ungerminated and germinated intact pollen in Nicotiana tabacum were compared.

利用膜不通透的荧光染料钙黄素作为指示剂，比较了烟草脱外壁花粉与完整的未萌发花粉和萌发花粉电激导入的效果。

Observation of spontaneous occurrence of 2n pollen in a fewC itrusspec ies confirm ed the existence of unreduced pollen in them.

试验中初步观察了柑橘属部分品种的2n花粉自然发生情况，证实了柑橘属内未减数花粉的存在。

Pollen morphology of Vaccinium ashei was investigated by scanning electron microscopy. Most of pollen grains are tetrahedron with tetrad construction.

扫描电镜下，兔眼越桔花粉为四合体，外形为准四面体，中等大小，表面具不规则皱波状纹饰，并有多处凹陷。

Vaccinium ashei ; pollen ; germination ; pollen tube

兔眼越橘；花粉；萌发；花粉管

Atmospheric pollen concentrations in a particular region vary markedly in response to geographical location, vegetational component, and various meterological parameters on many different time scales. Generally, during the 24-hour day, the highest pollen concentrations are observed at daylight, the lowest values are registered at night.

不同地区受其地理位置、植物组成和气候等多种因素的影响，空气花粉种类和浓度的变化模式有所不同，一般情况，一个地区白天空气花粉浓度高，夜晚浓度低；春夏季花粉浓度高，冬季花粉浓度低；春夏季乔木类植物花粉浓度高，而秋季草本类植物花粉浓度高。

Cable dampener cannot be rolled up but must be hung over the cable.

缆帆不能被卷起，必须保证处于展开状态

"This skylark is a present from my master," he says.

"这只云雀是我主人献上的礼物。"他说。