plumule การใช้

• Here the hypocotyl is a rudimentary axis between radicle and plumule.
• Growth of the plumule does not occur until the cotyledons have grown above ground.
• A . Seed Coat B . Cotyledon C . Hilum D . Plumule E . Radicle F . Endosperm
• These seeds develop by the plumule growing up through the soil with the cotyledons remaining below the surface.
• Fledglings are born with cryptic plumules that help them blend in with the surrounding ground material to avoid predation.
• In most seeds, for example the sunflower, the plumule is a small conical structure without any leaf structure.
• However, in seeds such as the broad bean, a leaf structure is visible on the plumule in the seed.
• The plumule is the part of a seed embryo that develops into the shoot bearing the first true leaves of a plant.
• It involves the reactivation of the metabolic pathways that lead to growth and the emergence of the radicle or seed root and plumule or shoot.
• The coleoptile is a protective cap that covers the " plumule " ( precursor to the stem and leaves of the plant ).
• The " radicle " is the embryonic root of the plant, and grows downward in the soil ( the shoot emerges from the plumule ).
• The goose down plumules ( each cluster made up of thousands of tiny feathery fibers radiating from a central point ), are larger, loftier and stronger than duck down.
• Overall, the filaments most closely resemble the " plumules " or down-like feathers of some modern birds, with a thick central quill and long, thin barbs.
• The opening of the cotyledons exposes the shoot apical meristem and the " plumule " consisting of the first " true leaves " of the young plant.
• Sixty days after germination the transfer of reserved from the seed has been completed, but it is only after 80 or 90 days that the young shoot ( the plumule ) emerges from the cotyledon.
• At each end of the axis is a growing point; one end ( the plumule ) is responsible for developing into the plant's shoot, the other end ( radicle ), its root.
• Gymnosperm seedlings also have cotyledons, and these are often variable in number ( multicotyledonous ), with from 2 to 24 cotyledons forming a whorl at the top of the hypocotyl ( the embryonic stem ) surrounding the plumule.
• The plumule is covered with a "'coleoptile "'that forms the first leaf while the radicle is covered with a "'coleorhiza "'that connects to the primary root and adventitious roots form from the sides.
• The seeds of corn are constructed with these structures; pericarp, scutellum ( single large cotyledon ) that absorbs nutrients from the endosperm, plumule, radicle, coleoptile and coleorhiza these last two structures are sheath-like and enclose the plumule and radicle, acting as a protective covering.