🌿 Vegetative Propagation
Study natural and artificial vegetative propagation for CUET Agriculture. Runners, rhizomes, grafting, budding, layering and cutting methods.
Asexual Reproduction (Vegetative Reproduction)
Vegetative reproduction allows plants to produce new individuals without seeds or spores — using vegetative parts like stems, roots, or leaves. The offspring are genetically identical clones of the parent.
Natural Vegetative Propagation
| Structure | Description | Examples |
|---|---|---|
| Runner | Horizontal stem growing along the soil surface; nodes produce new plants | Strawberry, Cynodon (doob grass) |
| Sucker | Underground lateral branch that emerges from the base of the parent plant | Banana, chrysanthemum, mint |
| Tuber | Swollen underground stem storing food; has "eyes" (buds) that sprout | Potato |
| Bulb | Short underground stem surrounded by fleshy scale leaves storing food | Onion, garlic, tulip, lily |
| Rhizome | Horizontal underground stem with nodes and internodes | Ginger, turmeric, Canna |
| Corm | Solid vertical underground stem (unlike the layered bulb) | Colocasia (arbi), Gladiolus, saffron |
| Offset | Short, thick runner in aquatic plants | Water hyacinth, Pistia |
| Bulbil | Modified floral bud that falls off and grows into a new plant | Agave, Dioscorea (yam) |
Key Distinctions (Click to expand)
- Runner vs Offset: Both are horizontal stems, but runners are for terrestrial plants and offsets are for aquatic plants
- Bulb vs Corm: A bulb has fleshy scale leaves around a short stem (onion — you can see the layers when cut). A corm is solid and compact throughout (like Colocasia/arbi — no layering)
- Rhizome vs Tuber: A rhizome is a horizontal underground stem (ginger — has nodes and scale leaves). A tuber is a swollen tip of an underground stem for food storage (potato — has "eyes"/axillary buds)
Artificial Vegetative Propagation
| Method | Description | Examples |
|---|---|---|
| Cutting | A stem, root, or leaf piece with a bud develops into a new plant when planted | Rose, sugarcane, grapes, Bougainvillea |
| Layering | A branch is bent to the soil and covered; roots develop at the buried node while still attached to the parent | Jasmine, Litchi, guava |
| Grafting | Scion (desired variety — provides the canopy) is joined to rootstock (strong root system — provides the foundation) | Mango, apple, citrus, rose |
| Budding | A single bud with a bark piece is grafted onto rootstock — a specialized type of grafting | Rose, citrus, peach |
| Tissue culture (Micropropagation) | Growing plants from small tissue pieces in a sterile nutrient medium — can produce thousands of identical plants | Orchids, banana, potato, ornamental plants |
Summary Cheat Sheet
| Concept / Topic | Key Details / Explanation |
|---|---|
| Vegetative reproduction | New plants from vegetative parts (stems, roots, leaves) without seeds/spores; offspring = genetic clones |
| Runner | Horizontal stem on soil surface; nodes produce new plants; e.g., strawberry, Cynodon (doob grass) |
| Sucker | Underground lateral branch from base of parent; e.g., banana, chrysanthemum, mint |
| Tuber | Swollen underground stem storing food; has "eyes" (buds); e.g., potato |
| Bulb | Short stem + fleshy scale leaves storing food; e.g., onion, garlic, tulip, lily |
| Rhizome | Horizontal underground stem with nodes/internodes; e.g., ginger, turmeric, Canna |
| Corm | Solid vertical underground stem (no layers like bulb); e.g., Colocasia (arbi), Gladiolus, saffron |
| Offset | Short thick runner in aquatic plants; e.g., water hyacinth, Pistia |
| Bulbil | Modified floral bud that detaches and grows; e.g., Agave, Dioscorea (yam) |
| Bulb vs Corm | Bulb has fleshy layers (onion); Corm is solid throughout (Colocasia) |
| Rhizome vs Tuber | Rhizome = horizontal stem with nodes (ginger); Tuber = swollen tip for storage (potato) |
| Cutting | Stem/root/leaf piece with bud → new plant; e.g., rose, sugarcane, grapes, Bougainvillea |
| Layering | Branch bent to soil, roots at buried node while attached; e.g., jasmine, litchi, guava |
| Grafting | Scion (desired variety, canopy) joined to Rootstock (strong root system); e.g., mango, apple, citrus, rose |
| Budding | Single bud + bark piece grafted onto rootstock; e.g., rose, citrus, peach |
| Tissue culture / Micropropagation | Plants from small tissue pieces in sterile medium; e.g., orchids, banana, potato |
| Scion | Top part of graft; provides desired fruit/flower variety |
| Rootstock | Bottom part of graft; provides disease-resistant root system; must be closely related species |
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Asexual Reproduction (Vegetative Reproduction)
Vegetative reproduction allows plants to produce new individuals without seeds or spores — using vegetative parts like stems, roots, or leaves. The offspring are genetically identical clones of the parent.
Natural Vegetative Propagation
| Structure | Description | Examples |
|---|---|---|
| Runner | Horizontal stem growing along the soil surface; nodes produce new plants | Strawberry, Cynodon (doob grass) |
| Sucker | Underground lateral branch that emerges from the base of the parent plant | Banana, chrysanthemum, mint |
| Tuber | Swollen underground stem storing food; has "eyes" (buds) that sprout | Potato |
| Bulb | Short underground stem surrounded by fleshy scale leaves storing food | Onion, garlic, tulip, lily |
| Rhizome | Horizontal underground stem with nodes and internodes | Ginger, turmeric, Canna |
| Corm | Solid vertical underground stem (unlike the layered bulb) | Colocasia (arbi), Gladiolus, saffron |
| Offset | Short, thick runner in aquatic plants | Water hyacinth, Pistia |
| Bulbil | Modified floral bud that falls off and grows into a new plant | Agave, Dioscorea (yam) |
Key Distinctions (Click to expand)
- Runner vs Offset: Both are horizontal stems, but runners are for terrestrial plants and offsets are for aquatic plants
- Bulb vs Corm: A bulb has fleshy scale leaves around a short stem (onion — you can see the layers when cut). A corm is solid and compact throughout (like Colocasia/arbi — no layering)
- Rhizome vs Tuber: A rhizome is a horizontal underground stem (ginger — has nodes and scale leaves). A tuber is a swollen tip of an underground stem for food storage (potato — has "eyes"/axillary buds)
Artificial Vegetative Propagation
| Method | Description | Examples |
|---|---|---|
| Cutting | A stem, root, or leaf piece with a bud develops into a new plant when planted | Rose, sugarcane, grapes, Bougainvillea |
| Layering | A branch is bent to the soil and covered; roots develop at the buried node while still attached to the parent | Jasmine, Litchi, guava |
| Grafting | Scion (desired variety — provides the canopy) is joined to rootstock (strong root system — provides the foundation) | Mango, apple, citrus, rose |
| Budding | A single bud with a bark piece is grafted onto rootstock — a specialized type of grafting | Rose, citrus, peach |
| Tissue culture (Micropropagation) | Growing plants from small tissue pieces in a sterile nutrient medium — can produce thousands of identical plants | Orchids, banana, potato, ornamental plants |
Summary Cheat Sheet
| Concept / Topic | Key Details / Explanation |
|---|---|
| Vegetative reproduction | New plants from vegetative parts (stems, roots, leaves) without seeds/spores; offspring = genetic clones |
| Runner | Horizontal stem on soil surface; nodes produce new plants; e.g., strawberry, Cynodon (doob grass) |
| Sucker | Underground lateral branch from base of parent; e.g., banana, chrysanthemum, mint |
| Tuber | Swollen underground stem storing food; has "eyes" (buds); e.g., potato |
| Bulb | Short stem + fleshy scale leaves storing food; e.g., onion, garlic, tulip, lily |
| Rhizome | Horizontal underground stem with nodes/internodes; e.g., ginger, turmeric, Canna |
| Corm | Solid vertical underground stem (no layers like bulb); e.g., Colocasia (arbi), Gladiolus, saffron |
| Offset | Short thick runner in aquatic plants; e.g., water hyacinth, Pistia |
| Bulbil | Modified floral bud that detaches and grows; e.g., Agave, Dioscorea (yam) |
| Bulb vs Corm | Bulb has fleshy layers (onion); Corm is solid throughout (Colocasia) |
| Rhizome vs Tuber | Rhizome = horizontal stem with nodes (ginger); Tuber = swollen tip for storage (potato) |
| Cutting | Stem/root/leaf piece with bud → new plant; e.g., rose, sugarcane, grapes, Bougainvillea |
| Layering | Branch bent to soil, roots at buried node while attached; e.g., jasmine, litchi, guava |
| Grafting | Scion (desired variety, canopy) joined to Rootstock (strong root system); e.g., mango, apple, citrus, rose |
| Budding | Single bud + bark piece grafted onto rootstock; e.g., rose, citrus, peach |
| Tissue culture / Micropropagation | Plants from small tissue pieces in sterile medium; e.g., orchids, banana, potato |
| Scion | Top part of graft; provides desired fruit/flower variety |
| Rootstock | Bottom part of graft; provides disease-resistant root system; must be closely related species |
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