18 Questions
Which specialized vegetative structure allows plants to reproduce by causing the stem to produce adventitious roots?
Stolons
What type of propagation is used for Pineapple and Banana due to their inability to produce seeds?
Tissue culture
How does vegetative propagation help in maintaining superior genotypes in plants like Tea and Rubber?
By producing identical offspring
In vegetative propagation, what is the main advantage of being able to combine different genotypes to form a superior genotype?
Overcoming genetic incompatibility issues
Why is vegetative propagation considered a rapid method for propagating valuable cultivars?
It avoids long maturation periods and seed dormancy
What is a key advantage of vegetative propagation during unfavorable environmental conditions?
It ensures propagation when seed production is limited
What is the advantage of using budding in roses?
Minimizes disease and pest incidence
Why might vegetative propagation pose a threat to biodiversity?
It causes lack of variation leading to decreased plant vigour
Which method involves regeneration from vegetative parts detached from the plant?
Cutting propagation
What is a disadvantage of vegetative propagation compared to seed propagation?
Multiplication of undesirable characters
Which naturally present vegetative structure involves food storage for plant survival?
Tuberous roots
Why is layering considered an effective method of vegetative propagation?
Allows for regeneration while parts are still attached to the plant
What is a key advantage of using root cuttings for plant propagation?
Can be taken from young stock plants during dormancy
Why is it recommended to take root cuttings during plant dormancy?
To avoid periods of rapid shoot growth
What distinguishes the method of propagating plants with large roots from those with small roots?
Depth of planting in the rooting medium
What is a characteristic of plants derived from root cuttings?
They are relatively large and vigorous
In propagation by layering, what is the 'layer' referred to?
The stem after it is detached from the parent plant
Why is layering considered an effective method of vegetative propagation?
It allows roots to develop on the stem while still attached to the parent plant
Study Notes
Vegetative Propagation
- Economical method of propagating certain horticultural crops, e.g., Roses, Hibiscus
- Minimizes incidence of disease and pests in certain crops by budding susceptible species onto resistant rootstocks, e.g., Grapes
Advantages of Vegetative Propagation
- Produces identical offspring plants to the parent plant, ensuring true-to-type progeny
- Results in uniformity of the plant population, with genetic variation absent among progeny
- Allows propagation of plants that produce little or no seeds, e.g., Pineapple, Banana
- Enables combination of different genotypes to form a superior genotype, overcoming genetic incompatibility issues
- Facilitates rapid propagation of valuable cultivars, avoiding juvenile stage, sexual cycle, seed dormancy, and long maturation
- Shortens the time to flower, as cultivars initiate growth at a mature phase, avoiding juvenile stages
Disadvantages of Vegetative Propagation
- Lack of genetic variation may lead to plants gradually losing their vigor, posing a potential impact on biodiversity
- Developing new varieties/cultivars cannot be achieved
- Some methods can be expensive, time-consuming, and require expertise
- Multiplication of undesirable characters, making the entire crop susceptible to the same disease, e.g., Banana
Methods of Vegetative Propagation
- Propagation by naturally present specialized vegetative structures, e.g., bulbs, corms, tubers, rhizomes, tuberous roots
- Induction of adventitious roots or shoots:
- Cutting propagation: Regeneration from vegetative parts detached from the plant
- Layering: Regeneration from vegetative parts while attached to the plant
- Totipotency: Capacity of a single cell to reproduce an entire plant through mitotic division
Root Cuttings
- Used for plants with large roots, taking a straight top cut and a slanted cut at 2’’ to 6’’ below the first cut
- Used for plants with small roots, taking a root section of 1’’ to 2’’ and inserting horizontally about ½’’ below the medium surface
- Requires enough food reserves (carbohydrates) to ensure survival and regeneration
Learn about the benefits and drawbacks of vegetative propagation in horticultural crops such as roses, Hibiscus, and grapes. Understand how this method can be used economically for certain plants and how it can help minimize disease and pest issues. Discover the potential loss of genetic variation and vigor that can occur with this type of propagation.
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