Tag: asexual modes of reproduction

In the tongue grafting, an oblique cut followed by a notch is given to both the stock as well scion. The two perfectly fit upon one another, they are tied together. Stock and scion are of the same diameter. In bud grafting, the scion is a bud with a small piece of bark and cambium. Monocots do not possess cambium, thus the two plants taken can be dicots only. In wedge grafting, the V-shaped notch is given to stock while the wedge-like cut is given to Scion. Both are also of the same diameter. In crown grafting, many scions are selected and shaped at the base to form a wedge. Many slits are formed on the sides of the stock. Scions are inserted in the slits and bandaged. The stock has a large diameter than Scion.

Grafting technique can be used to produce hybrids. In grafting, the vegetative parts of two plants are joined and allow to grow as a single plant. In grafting, the upper (shoot) portion of one plant is allowed to grow on the lower (root) portion of another plant. This process results in the formation of new hybrids.

(A)An apical bud is the one that is at the end of the shoot.

Runner is a modified stem which grows horizontally forward creeping on ground and producing roots at nodes. Common example of plants producing runners are grasses like Cynodon, Oxalis etc.
Grafting is a method of artificial vegetative propagation. It is usually practiced in dicots (like rose, mango etc) and cannot be done in monocots (like sugarcane, bamboo, banana etc) because in monocots vascular cambium is absent.
Adventive embryony is a type of agamospermy in which the gametophytic generation is completely eliminated. The zygotic embryo either degenerates or competes with apomictic embryos. Adventive embryony usually leads to the formation of more than one embryo in a seed. Well known examples of adventive embryony are citrus, cactaceae, euphorbiaceae, orchidaceae etc.

Grafting is the process of joining two plants together to grow as one. Grafting increases vegetative reproduction.

In a modification of vegetative reproduction from cuttings, a twig or bud from one plant can be grafted onto a plant of a closely related species or a different variety of the same species. Grafting makes it possible to combine the best qualities of different species or varieties into a single plant. The graft is usually done when the plant is young. The plant that provides the root system is called the stock; the twig grafted onto the stock is referred to as the scion. For example, scions from French varieties of vines that produce superior wine grapes are grafted onto root stocks of American varieties, which are more resistant to certain soil pathogens. The genes of the scion determine the quality of the fruit, so the quality is not diminished by the genetic makeup of the stock. In some cases of grafting, however, the stock can alter the characteristics of the shoot system that develops from the scion. For example, dwarf fruit trees, which allow for easier harvesting of the fruit, are made by grafting normal twigs onto stocks of dwarf varieties that retard the vegetative growth of the shoot system. Because seeds are produced by the part of the plant derived from the scion, they give rise to plants of the scion species when planted.

Scion is a type of vegetative propagation. The process of artificially growing the plants is known as vegetative propagation. Artificial vegetative propagation is usually used for propagation or reproduction of those plants which produce either very few seeds or do not produce viable seeds. Some the examples are Banana, pineapple, artificial rose, orange, grape etc. Layering, grafting, cuttings and tissue culture are some types of artificial propagation. Scion or grafting of a plant means removing the twig or viable bud from the plant and inserting or tying it to the other buds especially the aerial part/stem(Stock) of the other plant. The stock provides the nutritional support to the stock of the plant. 

The rootstock is generally derived from a plant that provided good enough support to stem, roots and branches, resist to the relevant pests and diseases and which obtain necessary water and mineral from the soil.