Question:
The origin of wound induced De Novo adventitious root in citrus is
The origin of wound induced De Novo adventitious root in citrus is
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Applying synthetic auxins like IBA (Indole-3-butyric acid) to stem cuttings stimulates cell division in the vascular cambium, speeding up the initiation and growth of adventitious roots.
Updated On: Jul 23, 2026
- Cambium
- Phloem
- Bark and Basal callus
- Nodal Segment
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
In plant propagation, adventitious roots are roots that form from any non-root tissue, such as stems, leaves, or petioles.
These roots are categorized as:
- Pre-formed root primordia (which are already present in the stem).
- *De novo* (newly formed) adventitious roots, which are induced by wounding or hormone applications on cuttings.
Step 2: Detailed Explanation:
Let us analyze the anatomical origin of *de novo* adventitious roots in woody stems like *Citrus*:
When a stem cutting is made or wounded, the plant initiates a healing and root-induction response.
In woody dicots like citrus, *de novo* root primordia typically originate from actively dividing cells in the vascular cambium or the adjacent phloem parenchyma.
The cambium is a layer of actively dividing meristematic cells located between the xylem and phloem.
Upon receiving hormonal signals (especially auxins moving downward from the shoot tip), cells within the cambial ring undergo rapid division.
This division leads to the formation of root primordia, which then grow outward through the cortex and epidermis to form functional roots.
While callus tissue (bark and basal callus) can form at the cut base, true organized root primordia emerge from the vascular cambium rather than disorganized callus tissue.
Step 3: Final Answer:
Wound-induced *de novo* adventitious roots in citrus originate from the cambium.
This matches Option (A).
In plant propagation, adventitious roots are roots that form from any non-root tissue, such as stems, leaves, or petioles.
These roots are categorized as:
- Pre-formed root primordia (which are already present in the stem).
- *De novo* (newly formed) adventitious roots, which are induced by wounding or hormone applications on cuttings.
Step 2: Detailed Explanation:
Let us analyze the anatomical origin of *de novo* adventitious roots in woody stems like *Citrus*:
When a stem cutting is made or wounded, the plant initiates a healing and root-induction response.
In woody dicots like citrus, *de novo* root primordia typically originate from actively dividing cells in the vascular cambium or the adjacent phloem parenchyma.
The cambium is a layer of actively dividing meristematic cells located between the xylem and phloem.
Upon receiving hormonal signals (especially auxins moving downward from the shoot tip), cells within the cambial ring undergo rapid division.
This division leads to the formation of root primordia, which then grow outward through the cortex and epidermis to form functional roots.
While callus tissue (bark and basal callus) can form at the cut base, true organized root primordia emerge from the vascular cambium rather than disorganized callus tissue.
Step 3: Final Answer:
Wound-induced *de novo* adventitious roots in citrus originate from the cambium.
This matches Option (A).
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