萌发孔 meaning in English
germ pore
germ-pore
germinal aperture
germination aperture
Examples
- Most of the germinal apertures were 3 couples , distributed symmetrically at the three sides by the axis of symmetry of the tetrahedron
萌发孔沟的长度、宽度、孔盖长宽与形状、突起的程度等，在个体间有差异。 - Cupressus ) the pollen grains contain just two nuclei : a generative nucleus and a vegetative nucleus ( tube nucleus )
当花粉粒形成后，花粉粒壁上分布有萌发孔，花粉管从萌发孔处向外突起形成管状结构，生殖核转入管中。 - During the late microspore stage , a big vacuole formed and the nucleus was forced to move to peripheral region
当小孢子被释放出后，钙颗粒开始特异性积累在正在形成的花粉外壁中，尤其在萌发孔的部位聚集了大量的钙颗粒。 - The results indicate that pollen grains radially symmetrical , apolar , spheroidal , the exine with distinct spines and temuity or perforation , usually the spines very small and dense
7urn ，无极面、无萌发孔。花粉粒表面具三角形或乳突状小刺，小刺密集整齐，密度在（ 2 - The evolutionary trend of the germination apertures of the pollen grains in this tribe may be from the absence of germination apertures to the presence of 3 , 4 - colpate , then to 3 - colporate germination aperture
无萌发孔的山莫若属是原始类群，三孔沟的马尿泡和天仙子等属是进化类群。