Abstract: Cultivated species comprise less than 1% of about 300,000 species of flowering plants; nevertheless, they are quite diverse in their reproductive structures and behavior. This chapter deals mostly with the general life cycle of angiosperms and discusses some differences between dicots and monocots and individual species. Meiosis in angiosperms occurs only in micros pore mother cells and megaspore mother cells. Stigmas of cross-pollinated flowers may collect pollen from many different plants. Interaction between pollen and stigma proteins often governs pollen germination and pollen tube penetration into the style. After penetrating the micropyle and nucellus, the pollen tube enters the embryo sac by means of enzymatic digestion of the embryo sac wall. Within this embryo sac, the egg cell and polar nuclei usually form an embryo and endosperm without fertilization. In the normal type of embryo sac development, one cell in the nucellus enlarges to become the megaspore mother cell.
Publication Year: 2013
Publication Date: 2013-08-12
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 3
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