In flowering plants, the megagametophyte (also referred to as the embryo sac) is much smaller and typically consists of only seven cells and eight nuclei. This type of megagametophyte develops from the megaspore through three rounds of mitotic divisions.t consists of three parts: The integument(s) forming its outer layer(s), the nucellus (or remnant of the megasporangium), and female gametophyte (formed from haploid megaspore) in its center. The female gametophyteâspecifically termed a megagametophyte âis also called the embryo sac in angiosperms.
Late winter or early spring is the best time to begin spraying an apple tree. Using horticultural oil spray helps to destroy any insects and their eggs on the tree before new growth begins.
Tree fungus grows directly on tree limbs, producing mushrooms, conks and other fungal-fruiting structures. Pruning infected limbs with a disinfected pruning saw and disposing of them away from the tree keeps the fungus from spreading. Spraying tree limbs and leaves with a combination of Bordeaux mixture and water until saturated kills the fungus. One tablespoon of Bordeaux can be mixed with 1 gallon of water. It is recommended to spray the tree again at bud swell and bloom time, especially during damp conditions.