| Abstract from DBPedia | Pollen is a powdery substance produced by seed plants. It consists of pollen grains (highly reduced microgametophytes), which produce male gametes (sperm cells). Pollen grains have a hard coat made of sporopollenin that protects the gametophytes during the process of their movement from the stamens to the pistil of flowering plants, or from the male cone to the female cone of gymnosperms. If pollen lands on a compatible pistil or female cone, it germinates, producing a pollen tube that transfers the sperm to the ovule containing the female gametophyte. Individual pollen grains are small enough to require magnification to see detail. The study of pollen is called palynology and is highly useful in paleoecology, paleontology, archaeology, and forensics. Pollen in plants is used for transferring haploid male genetic material from the anther of a single flower to the stigma of another in cross-pollination. In a case of self-pollination, this process takes place from the anther of a flower to the stigma of the same flower. Pollen is infrequently used as food and food supplement. Because of agricultural practices, it is often contaminated by agricultural pesticides.花粉（かふん、英語: pollen）とは、種子植物門の植物の花の雄しべから出る粉状の細胞。雄しべの先端にある葯という袋の中で形成される。 花粉は雄しべの葯から出て雌しべの柱頭に付くまでの間の粉状のものの抽象的な呼び名である。花粉は基本的に多細胞体であり、これはシダ植物のが発芽した雄性配偶体にあたるものである。花粉に対して個々の粒を花粉粒と呼ぶことがある。ラン科植物では花粉が塊になり、はなはだしい場合にはプラスチック片状にすらなる花粉塊を形成する。 (Source: http://dbpedia.org/resource/Pollen) |
