ovule

The ovule (ovule) for ovary In the oval body, is seed The precursor structure after fertilization develops into a seed. Packets are angiosperm ovules in the ovary, the funiculus attached to ovary wall placenta. Gymnosperms The ovule was born in the bare land. Megasporophyll On. Generally oval. The number of the plant species.
ovule

ovule brief introduction

The ovule (ovule) for ovary In the oval body, is seed The precursor.
Ovules from Funicle , The beads are , Micropyle and Nucellus The composition, basic structure as shown in figure.
Funicle (funicle) is connected with the ovule Placenta The short handle, in the vascular bundle The ovules and ovaries connected with the transfer of nutrition and hormone . Ovules was originally a whole regiment Nucellus (nucellus) organization, as the base of the Cells Divide quickly and form a layer or two layer coated layer of integument (integument), the other nucellus tissue wrapped in a hole at one end and left - micropyle (micropyle). Most Angiosperm Both inside and outside the two layer of integument. The integument, the base and the confluence area is known as the funicle Point (chalaza), is the funicle bundle into the embryo sac Position. Funicle , Micropyle And the three position changes formation Several common types of ovule, which Anatropous The most common in angiosperms. Ovule types sometimes can also be used as identification and classification Basis . Angiosperms into
 The location of the ovule The location of the ovule
Mature ovule, including the nucellus and integument of two parts. The most important part in the ovule, embryo sac and eggs. The periphery of the integument is Protection organization That is usually divided into Outside the Pearl River Is the two layer and inner integument. The ovule originated in the ovary wall The epidermis The group of cells, called ovule primordia. The front end primordium developed into the base of the formation and occurrence of funicle, embryo sac in the Pearl heart. The basal cell division was formed rapidly, pearl. The beads are gradually expand upward, will be surrounded by the nucellus in them, leaving only a small hole in the top, called the micropyle. The micropyle is Pollen tube Reached the embryo sac channel. Funicle place is incorporated into the ovule body, integument and nucellus with region, known as the point, by Carpels Enter the funicle bundle into the ovule or end here. After fertilization, the ovule develops into a seed. As a result of the growth way of ovule is different, there are Anatropous , Straight ovules , Amphitropous and Campylotropous ovule The other. (A structure in seed plants containing the female gametophyte with egg cell all being surrounded by the nucellus and one or two integuments when mature an ovule becomes; a seed.)

ovule Ovule composition

Exposed Megaspore The leaves contained within the ovary or by the nucellus, integuments and micropyle in several parts of the structure.
Funicle: ovule base small shank. The ovule funiculus attached to placenta, placenta with the funicle bundle into the ovule, the supply of food.
The integral part of ovule. Is located in the Pearl River, by the Parenchyma cell The big. Spore . The further development of megaspore into embryo sac"
The beads are: one part of the ovule, the ovule funiculus, integument and Nucellus . Ovules was originally a whole group of nucellus (nucellus) organization, due to the base of the cell division Quickly formed one or two layers of coated layer of integument (integument), the other nucellus tissue wrapped in a hole at one end and left - micropyle (micropyle). The majority of angiosperms have two inner and outer layer of integument. The beads are The base, confluent and funiculus Position Known as the point (chalaza), is the funicle bundle into the embryo sac Position.

ovule structure characteristics

White ball.
Have the most in the ovule Placentas 2 fruit a fleshy, long oval.

ovule Ovule type

Straight ovules (atropous ovule or orthotropus ovule): the uniform growth of the ovule, ovule upright was born in the line on the handle, namely the micropyle, nucellus, and chalazal funiculus in the same line, such as buckwheat , walnut Ovule.
Anatropous ovule (anatropous ovule): one side of the other side of fast growth, slow growth, slow growth of the reverse side of the ovule to about 180 degrees, not bent on one side of the micropyle nucellus, funicle base, and on one side of the bead handle relative, near funicle side of the outer integument and Pearl handle paste students, forming a bead ridge, outward uplift. Connection point, nucellus and micropyle and almost parallel to the funicle. Most angiosperm ovules belong to this type. Such as rice and wheat, Lily And cotton ovules.
Amphitropous (hemianatropous ovule): one side of the ovule grew faster, ovule torsion about 90 degrees in the Pearl on the handle, connecting wire, and the micropyle nucellus and funiculus almost at right angles, such as Mallow The ovule, buttercup.
Campylotropous ovule (campylotropous ovule): the ovule Half The growth is uniform, the upper side of the bend to slow growth, also has a certain degree of bending of the embryo sac, to handle the micropyle direction downward, such as rape, Broad bean Such as beans, lentils.
Such as: circinotropous ovule Cactus Sumac.