The root is a vascular portion of the plant that is usually underground and serves as the plant’s anchoring to the soil. It takes water, nutrients, and minerals from the same source and feeds them to the plant body for growth and development. In some plants, it also serves as a food and nutrient storage unit as well as a reproductive organ. The root system of some plant species also has a symbiotic association with specific fungi and mycorrhizae, helping the organisms and growth.
The absence of leaf scars and buds distinguishes the root from the stem. There is also a root cap on the system, as well as branches that come from the interior tissue. This subject provides an overview of the root system’s structure.
The root system’s structure can be divided into four distinct characteristics. These are the following:
The root tip is covered and protected by a cup-shaped, loosely cemented mass of parenchyma cells. New cells are generated and added to the meristem of the cap when the old layer of parenchyma cells is lost among the soil particles. A significant number of new cells are created, which help the root tip push through the soil by replacing worn or damaged cells. A slimy material called mucigel aids the mobility of the root tip and serves the following purposes:
In roots, this zone is also the centre of meristematic activity. The apical meristem is located beneath and behind the root cap, and it produces cells that aid in the formation of the plant’s major body, similar to the stem apical meristem. Unlike the stem meristem, the apical meristem is found behind the root cap rather than at the root’s tip. There is a grey space between the active cell division area and the cap where the cells divide more slowly. The quiescent centre is what it’s called. The majority of cell divisions in a plant’s root system occur around the borders of this centre, resulting in columns of cells that are aligned parallel to the root axis. The meristem’s parenchyma cells are tiny and cuboidal, with thick protoplasts that lack a vacuole. The nucleus of these cells is also quite big.
The three basic portions of the meristematic region meristems are formed by the root’s apical meristem:
Pith is a component of the vascular system found in most stems and produced by the ground meristem. The majority of dicot roots lack this sector, however many monocot roots do.
As tiny vacuoles within the cytoplasm of the cells coalesce and fill with water, the cells in this zone of elongation stretch and lengthen. In fully elongated cells, one or two giant vacuoles fill nearly all of the cell volume. Due to cellular expansion in this region, the apical tip and root cap of the root cap travel forward through the soil. The length of the entire region is around 4-8 mm.
In this region or zone, the cells of the elongation region finish their differentiation into primary body tissues. The presence of multiple root hairs that extend through the soil as outgrowths from a single epidermal cell makes it easy to identify.
The root hairs increase the absorptive surface of roots during the plant’s growth cycle; huge amounts of water and nutrients are required during this time, and the root hairs help. A single root hair has a lifespan of barely a day or two. However, as old ones die in the upper part of the zone, new ones continue to emerge at the tip.
The root system performs a variety of basic and secondary tasks that are critical to the growth of a plant body.
Profile
Settings
Refer your friends
Sign out
