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In botany, a cortex is an outer layer of a stem or root in a vascular plant, lying below the epidermis but outside of the vascular bundles. [1] The cortex is composed mostly of large thin-walled parenchyma cells of the ground tissue system and shows little to no structural differentiation. [ 2 ]
This network extends between the epidermal cells near the root surface, and may also extend between cells in the root cortex. [ 2 ] [ 4 ] The hyphae in the Hartig net formed by some ECM fungi are described as having transfer-cell like structures, with highly folded membranes that increase surface area and facilitate secretion and uptake of ...
Root hair cells vary between 15 and 17 micrometers in diameter, and 80 and 1,500 micrometers in length. [5] Root hairs are found only in the zone of maturation, also called the zone of differentiation. [6] They are not found in the zone of elongation, possibly because older root hairs are sheared off as the root elongates and moves through the ...
A true root system consists of a primary root and secondary roots (or lateral roots). the diffuse root system: the primary root is not dominant; the whole root system is fibrous and branches in all directions. Most common in monocots. The main function of the fibrous root is to anchor the plant.
Parenchyma is a versatile ground tissue that generally constitutes the "filler" tissue in soft parts of plants. It forms, among other things, the cortex (outer region) and pith (central region) of stems, the cortex of roots, the mesophyll of leaves, the pulp of fruits, and the endosperm of seeds.
It harbors two pools of stem cells around an organizing center called the quiescent center (QC) cells and together produces most of the cells in an adult root. [20] [21] At its apex, the root meristem is covered by the root cap, which protects and guides its growth trajectory. Cells are continuously sloughed off the outer surface of the root ...
Bust of Lý Thường Kiệt. Lý Thường Kiệt (李 常 傑; 1019–1105), real name Ngô Tuấn (吳 俊), was a Vietnamese general and admiral of the Lý dynasty. [1] He served as an official through the reign of Lý Thái Tông, Lý Thánh Tông and Lý Nhân Tông and was a general during the Song–Lý War.
Panax vietnamensis faces a number of threats to its survival as a species in Vietnam. With increased demand from the herbal medicine industry, locals have over-harvested the plant in the wild. [ 4 ] The species is slow-growing, taking around 10 years to reach maturity. [ 3 ]