which structure emerges out during pollen germination
by Prof. Georgianna Sporer II
Published 3 years ago
Updated 2 years ago
During germination, intine (inner wall) of pollen grain emerges out as pollen tube through one of the germ pores in exine (outer wall).
What structure does pollen germinate?
pollen tubeA pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates.
What happens during pollen germination?
When pollen grains land on the stigma, compatible grains germinate and an elongating tube forms and grows through the aperture of the pollen grain. Pollen germination is closely related to its hydration to produce turgor, which pushes the pollen cytoplasm to protrude through the aperture to form the pollen tube.
What is pollen germination short answer?
Pollen germination starts with the pollen grain landing on stigma. The cell of the pollen grain divides into two cells- one of these is smaller in size and called generative cell and bigger one is called tube cell. The intine grows out through the germ pore and form pollen tube.
Where does pollen germination occurs in flower?
First, germination of pollen occurs in the anther of rtg/+ plants at an immature developmental stage. In 70% of the angiosperms bicellular pollen is released from the anthers and pollen mitosis II occurs after germination and pollen tube penetration into the female tissue.
What is pollen germination in biology?
The pollen grains will germinate when submerged in the nutrient-rich medium. This is characterized by the enlargement of the vegetative/tube cell. It emerges through one of the germ pores, eventually forming a pollen tube. The generative cell nucleus grows into the pollen tube and makes two male gametes (sperm nuclei).
Why is pollen germination important?
During germination, the tube cell expands into a pollen tube. The pollen tube then grows towards the flower's ovule, where it releases the sperm generated in the pollen grain for fertilization. The germinated pollen grain with its two sperm cells in the adult male microgametophyte of these plants.
18 hours ago
· This swelling leads to the rupture of the seed coat, and the hypocotyl emerges out of the seed to transform into the stem. This proliferation of a little stem-like structure from the seed is called germination. In monocots, the seed coat does not rupture and is fixed in one place. The hypocotyl originates from one specific point in monocots.
31 hours ago
oxygen for germination. The radicle root quickly emerges near the tip of the kernel, depending on soil moisture and temperature conditions. The coleoptile emerges from the embryo side of the kernel and is pushed to the soil surface by mesocotyl elongation. The mesocotyl encloses the plumule leaves that open as the structure approaches the soil surface. Management Ideal soil …
14 hours ago
pl. apices The tip; the point furthest from the point of attachment. aphananthous (of flowers) Inconspicuous or unshowy, as opposed to phaneranthous or showy. aphlebia pl. aphlebiae Imperfect or irregular leaf endings commonly found on ferns and fossils of ferns from the Carboniferous Period. aphyllous Leafless; having no leaves. apical At or on the apex of a …
13 hours ago
Fig. 4.5: Set-up for investigating conditions necessary for germination Epigeal Germination. During the germination of a bean seed, the radicle grows out through the micropyle. It grows downwards into the soil as a primary root from which other roots arise. The part of the embryo between the cotyledon and the radicle is called the hypocotyl.
29 hours ago
The pollen grains germinate in the stigma and the pollen tubes that carry the male gametes reach the ovule and eject two gametes near the ovule. In bisexual animals, the organism has to develop a special mechanism for the transmission of gametes, since male and female gametes are formed in different individuals and this is essential for fertilization.
32 hours ago
Andrew File System (AFS) ended service on January 1, 2021. AFS was a file system and sharing platform that allowed users to access and distribute stored content. AFS was available at afs.msu.edu an…
16 hours ago
The loss of plants during germination or later in the growing season due to insects, diseases, weed competition, or other stresses can amount to 15–25% of the seeding rate. Harvest population is the most important plant density measurement, since this represents the plant stand that produces the grain yield. If moisture and fertility are adequate, and the stand loss is …
28 hours ago
Vegetable gardening is a rewarding activity that can provide fresh, flavorful produce. It offers many of the same benefits as other gardening activities, including exercise, fresh air, landscape beautification and enjoyment. In addition, it promotes a varied and nutritious diet at a lower cost by reducing food expenditures more than the costs associated with growing the vegetables. …
10 hours ago
· Structure formed during feather development as a feather papilla elongates epidermis The outer layer of the skin; it protects the inner layer—the dermis—and does not contain blood vessels. In birds, it gives rise to the feathers and to the horny sheath covering the bill, legs, and feet, including the claws. epiphytes Plants that grow on other plants but, in contrast to parasitic …
36 hours ago
Ergot (/ ˈ ɜːr ɡ ə t / UR-gət) or ergot fungi refers to a group of fungi of the genus Claviceps.. The most prominent member of this group is Claviceps purpurea ("rye ergot fungus"). This fungus grows on rye and related plants, and produces alkaloids that can cause ergotism in humans and other mammals who consume grains contaminated with its fruiting structure (called ergot …