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Adventitious – roots that form from other than the hypocotyl or from other roots. Roots forming on the stem are adventitious. Aerial – roots growing in the air. (Root) crown – the place where the roots and stem meet, which may or may not be clearly visible. [10] Fibrous – describes roots that are thread-like and normally tough.
The adventitia (/ æ d v ɛ n ˈ t ɪ ʃ ə / ad-ven-TI-shuh) is the outer layer of fibrous connective tissue surrounding an organ. [1]The outer layer of connective tissue that surrounds an artery, or vein – the tunica externa, is also called the tunica adventitia.
Once brace roots emerge from stem nodes, the influence of external factors such as the availability of water, nutrients, light and humidity become prominent. Therefore, a combination of internal and external factors determine the overall organization, shape, and size of individual roots (root system architecture) and, as a result, root function.
The aerial roots in this case work as regular surface roots. There are also several types of roots, creating a cushion where a high humidity is retained. Some of the aerial roots, especially in the genus Tillandsia, have a physiology that collects water from humidity, and absorbs it directly.
Propagation via root cuttings requires adventitious bud formation, e.g., in horseradish and apple. In layering, adventitious roots are formed on aerial stems before the stem section is removed to make a new plant. Large houseplants are often propagated by air layering. Adventitious roots and buds must develop in tissue culture propagation of ...
The body of the sporophyte is well differentiated into roots, stem and leaves. The root system is always adventitious. The stem is either underground or aerial. The leaves may be microphylls or megaphylls.
Growth from any such meristem at the tip of a root or shoot is termed primary growth and results in the lengthening of that root or shoot. Secondary growth results in widening of a root or shoot from divisions of cells in a cambium. [8] In addition to growth by cell division, a plant may grow through cell elongation. This occurs when individual ...
The nodes of the stolons produce roots, often all around the node and hormones produced by the roots cause the stolon to initiate shoots with normal leaves. [5] Typically after the formation of the new plant the stolon dies away [ 6 ] in a year or two, while rhizomes persist normally for many years or for the life of the plant, adding more ...