Question

Which phytohormone would you use if you are asked to ‘bolt’ a rosette plant?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Any of these

Answer 1

Hint: The hormone which is used to induce a rosette is also responsible for delay in senescence and rapid maturity. Rosette is a special type of leaf arrangement where the internodes are reduced but the leaves are well ordered.

Complete answer:
Gibberellins can start to increase the length of the stem in rosette plants. Bolting is a term used for internode formation and elongation occurring prior to the production of new leaves. Spraying or adding gibberellins to the plants can help promote bolting a rosette just before reproduction.

Additional Information: 1. In nature, bolting is naturally done by long days or wintery nights.
2. Examples of rosette plant include some succulents, lettuce, and dandelion
3. Gibberellins are extracted from fungi and not plants themselves.
4. In simple terms, a rosette is a plant with leaves surrounding the stem in a circular manner
5. Bolting can affect the flowering of many agricultural crops such as spinach and fennels which can be overcome by spaying effective plant hormones, in this case, the plant hormone that can be applied is gibberellin.
6. Bolting can also be prevented by planting early in spring.
7. Gibberellin was discovered by a Japanese botanist, Kurosawa.
So, the correct answer is, gibberellins.

Note: olting is the production of leaves on the stem.
Gibberellins are also responsible for breaking the dormancy of a seed.
Gibberellins are more effective than auxins in inducing parthenocarpy.
Gibberellins can stimulate stem elongation in sugar cane.
Gibberellins are responsible for sex expression in some plants.