The structure of cycads male cones is quite consistent with the wind dispersal of pollen, clouds of which are released from some of the larger cones.
苏铁雄球果的结构与花粉的风传播相当一致，花粉云从一些较大的球果中释放出来。
Heteromorphic systems involve two or three different forms of flower with differences in pollen and stigma structure and usually differences in style and stamen length.
异态不亲和系统涉及两种或三种不同类型的花，它们的花粉和柱头结构存在差异，通常是花柱和雄蕊的长度不同。
The Holocene stratum of Quzhou district is quite different from other areas of Hebei Plain in terms of the buried depth, thickness, depletion rate, color, grain size, structure and pollen assemblages.
河北平原南部曲周地区的全新世地层，在埋藏深度、地层厚度、堆积速率和颜色、粒度结构、孢粉含量与种属等方面，与河北平原其他地区不同。
The preliminary studies on male sterile mechanism of Chinese jujube including the changes of anther anatomic structure and isoenzyme including POD, COD, AMY during pollen development were achieved.
通过研究雄性不育种质单花发育过程中花药解剖结构及过氧化物酶（POD）、细胞色素氧化酶（COD）和淀粉酶（AMY）同工酶的变化，初步揭示了枣树雄性不育的机理。
Spatial autocorrelation statistics were used to examine the spatial structure of genetic variation. No significant pattern was detected, which suggested extensive pollen flow.
利用空间自相关分析检测上述四个种群的空间遗传结构，结果表明，四个种群中的成株均无显著的空间自相关。
By using electron microscope, the morphology structure of lotus pollen was observed.
利用电镜对白莲花粉形态结构进行了观察。
The results showed that the mother pollen cells presented decreased ribosome numbers at leptotene and zygotene stages, and simplified mitochondria structure;
花粉发育过程做了超微结构观察。结果表明，在花粉母细胞细线和偶线期，核糖体数量减少、线粒体结构简化；
Surface structure of the pollen grains was found to be one of the major factors affecting the feeding behavior of the predator.
花粉粒的外部形态结构，是影响该螨能否取食的重要因素之一。
Surface structure of the pollen grains was found to be one of the major factors affecting the feeding behavior of the predator.
花粉粒的外部形态结构，是影响该螨能否取食的重要因素之一。
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