triple fusion

Triple fusion is a key process in the reproduction of seed plants, specifically angiosperms. It occurs during double fertilization, a unique event in flowering plants. In this process, one sperm nucleus from a pollen grain fuses with the egg cell to form a zygote, which develops into the embryo. Simultaneously, a second sperm nucleus fuses with two polar nuclei within the embryo sac. This fusion of three nuclei results in the formation of the endosperm, a nutritive tissue that sustains the developing embryo and seedling. The endosperm is typically triploid (3n). This dual fertilization event ensures the formation of both the embryo and its food source, the endosperm, within the seed.123