![]() ![]() Nectar is secreted from epidermal cells of the nectaries, which have a dense cytoplasm, by means of trichomes or modified stomata. The different types of floral nectaries coevolved depending on the pollinator that feeds on the plant's nectar. Non-structural nectaries secrete nectar infrequently from non-differentiated tissues. Structural nectaries refer to specific areas of tissue that exude nectar, such as the types of floral nectaries previously listed. Nectaries can also be categorized as structural or non-structural. Nectaries may also vary in color, number, and symmetry. These exude nectar from small pores on the surface of the gynoecium. Many monocotyledons have septal nectaries, which are at the unfused margins of the carpels. In most Brassicaceae the nectary is at the base of the stamen filament. Most members of Lamiaceae have a nectariferous disc which surrounds the ovary base and derived from developing ovarian tissue.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |