bestøvningsangreb

Bestøvningsangreb refers to the process where pollen grains adhere to the stigma of a flower. This is a crucial step in sexual reproduction for flowering plants. The pollen grain, containing the male gametes, must successfully land on the receptive surface of the stigma. This transfer can occur through various agents, including wind (anemophily), insects (entomophily), birds (ornithophily), or water (hydrophily).

Once on the stigma, the pollen grain absorbs moisture and nutrients, initiating germination. This involves the growth of a pollen tube down through the style towards the ovary. The pollen tube carries the male gametes to the ovule, where fertilization can take place, leading to the development of seeds and fruits. The success of a bestøvningsangreb depends on factors such as pollen viability, stigma receptivity, and the efficiency of the pollination vector. In some cases, self-pollination may occur, where pollen from the same flower or plant fertilizes the ovule. In others, cross-pollination is necessary, requiring pollen from a different plant of the same species. Environmental conditions like humidity and temperature can also influence the effectiveness of this process.