PGRs that enhance branching include active ingredients like ethephon, benzyladenine, dikegulac sodium or methyl esters.
Complete Answer: A) In order to induce rooting in a twig, we would need to use any of the auxins like Indole acetoacetic acid or IAA.
Cytokinin are adenine derivatives. They are a group of plant growth regulators which are primarily involved in performing cell division in plant roots, shoot system.
The five primary plant growth regulators are auxins, cytokinins, gibberellins, abscisic acid and ethylene. Each plant growth regulator functions in different ways. For instance, Auxins induce calli.
Auxin such as IBA play a critical role in determining adventitious rooting during vegetative propagation.
Bolting, i.e., internode elongation lust prior to flowering in beet, cabbage, and many rosette plants, is promoted by. gibberellins.
Auxin, a naturally occurring plant hormone, stimulates root formation. Several synthetic forms of auxin are sold as “rooting hormone.” Though some plants will root readily without treatment, application of rooting hormone to the base of the cutting will often improve your chance for success.
Abscisic acid and ethylene hinder development in plants. Abscisic acid can be synthesized through the leaves and then translocated through the phloem to stem apices. ABA is a strong inhibitor of growth.
Phytotoxicity. Phytotoxic effects have been noted on some plant species following application of PGRs, including foliage discolouration, leaf crinkling, growing point distortion and stunting. Often symptoms can be related to incorrect rates or water volumes, or poor application technique.
Also, artificial treatment of long day plants with gibberellins in cases when the hormone is absent induces flowering. So, the correct option is 'Gibberellins'.
PGR is a broad term for any product that uses plant hormones to generate a plant response. PGRs can initiate many plant responses, from more vigorous root growth and stem elongation to plant senescence.
Ethylene is the most widely used plant growth regulator as it helps in regulating many physiological processes. Induce flowering in the mango tree. Promotes sprouting of potato tubers. Breaks the dormancy of seeds and buds.
Gibberellins (GAs) break seed dormancy and promote germination (1, 2), and several other hormones, including brassinosteroids, ethylene, and cytokinin, have also been shown to promote seed germination (3, 4). However, abscisic acid (ABA) is the only hormone known to induce and maintain seed dormancy.
The plant growth regulator (PGR) group of herbicides (SOA 4, SOA 19) are important for broadleaf weed control. Uptake of these herbicides is usually through the foliage; however, root uptake can occur.
So, the correct answer is, 'Ethylene'.
The correct option is: b AuxinExplanation:Auxins promote root initiation at a concentration which otherwise is inhibitory for growth of intact root. Auxins are often employed for inducing flowering in litchi and pineapple.
5 groups of plant-growth-regulating compounds. There are five groups of plant-growth-regulating compounds: auxin, gibberellin (GA), cytokinin, ethylene, and abscisic acid (ABA). For the most part, each group contains both naturally occurring hormones and synthetic substances.
Summary: Exercise is a very potent stimulator of growth hormone release and there is considerable research documenting the dramatic growth hormone rise.
with overapplication, stems become excessively short. Fortunately, in many instances, you can recover from a PGR overdose with an application of GA. Gibberellic acid can help you overcome the accidental overapplication of plant growth regulators.
Surfactants do not increase the activity of a plant growth regulator, but they can improve contact and uptake, and, therefore, improve the PGR's effectiveness on plants.
To ensure maximum efficacy of PGRs, they should be applied late in the afternoon or early in the evening to prevent rapid evaporation from the leaf surface and to allow the chemical to be absorbed slowly by the plant overnight.
Rooting hormone products, which are commonly sold in powder, liquid, and gel form, contain natural auxins or synthetic compounds, which can be applied to clippings to stimulate root growth during propagation.
Plant growth regulators usually auxin have an important role in stimulation and initiation of roots to cutting.