Adventitious root growth forms off stems, bulbs, corms, rhizomes or tubers. What Does Adventitious Mean? Define adventitious. See more. adventitious (of a root) growing laterally from a stem rather than the main root, e.g. A mass of adventitious roots along with its branches constitutes an ‘adventitious root system.’ The adventitious root system is different from the taproot system in such a way that instead of having one primary root from which the branches arises, there are numerous morphologically similar roots arising from the same node in adventitious roots. Auxin is known to play a central role in AR formation; however, the mechanisms underlying this role are not well understood. prop roots of maize, clinging roots of climbing vines, and roots of BULBS, such as the daffodil. Background: Adventitious root (AR) formation is a complex genetic trait, which is controlled by various endogenous and environmental cues. Plants with adventitious roots have an extra edge on plants with traditional root systems. They are not part of traditional root growth and provide a means for a plant to spread without relying on underground root systems. Adventitious roots are plant roots that form from any nonroot tissue and are produced both during normal development (crown roots on cereals and nodal roots on strawberry [ Fragaria spp.]) Define adventitious root. Noun 1. adventitious root - root growing in an unusual location e.g. adventitious definition: 1. not expected or planned: 2. not expected or planned: . Some roots, called adventitious roots, arise from an organ other than the root—usually a stem, sometimes a leaf. 1. Adventitious roots (ARs) are formed from non-root tissues, such as stems, leaves, and petioles. For most trees and some herbaceous species, the ability to form ARs is a major factor that determines their cultivation because these plants are mainly propagated clonally. adventitious synonyms, adventitious pronunciation, adventitious translation, English dictionary definition of adventitious. They are especially numerous on underground stems, such as rhizomes, corms, and tubers, and make it possible to vegetatively propagate many plants from stem or leaf cuttings. Furthermore, taproot penetrates deep into the soil while adventitious root does not penetrate into the soil deeply. adj. adventitious root synonyms, adventitious root pronunciation, adventitious root translation, English dictionary definition of adventitious root. b. In root: Types of roots and root systems. Adventitious definition, associated with something by chance rather than as an integral part; extrinsic. Tap Root Fibrous (Adventitious) Root; Meaning: Such roots which develop into primary root arising from radicle (embryonic root), these become the main root of the plant,with secondary, tertiary and other lateral branches. (of a bud) not developing in a leaf axil, as in Begonia where such buds can be produced from leaf wounds. and in response to stress conditions, such as flooding, nutrient deprivation, and wounding. Learn more. The main difference between taproot and adventitious root is that the taproot is the main root, growing down deep into the soil, whereas the adventitious root (or fibrous root) is made up of a group of roots of similar size and similar shapes. ... Of or belonging to a structure that develops in an unusual place: adventitious roots. 1 people chose this as the best definition of adventitious: Of or belonging to a stru... See the dictionary meaning, pronunciation, and sentence examples. 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