How Hormones And Growth Regulators Affect Your Plants?

Hormones are produced naturally by plants, while plant growth regulators are applied to plants by humans. Plant hormones and growth regulators are substances that affect.

 

Hormones are produced naturally by plants, while Broiler Chicken Cage are applied to plants by humans. Plant hormones and growth regulators are substances that affect.

Flowering.
Ageing.
Root growth.
Distort and kill organs.
Prevent or promote stem elongation.
Fruit colour enhancement.
Prevents defoliation, leaf drop or both.
Many other conditions.
Very small concentrations of these substances can produce significant growth changes.
Plant growth regulators can be synthetic compounds that mimic natural plant hormones, such as IBA and Cycocel, or they can be natural hormones derived from plant tissue, such as IAA.

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Five groups of plant growth regulating compounds

There are five groups of plant growth regulators: growth hormones, gibberellins (GA), cytokinins, ethylene and abscisic acid (ABA). In most cases, each group contains both natural hormones and synthetic substances.

 

Growth hormones

Growth hormones cause several reactions in plants.

 

Bending towards a light source (phototropism).
Downward root growth in response to gravity (geotropism).
Promotion of apical dominance (the tendency of an apical shoot to produce hormones that inhibit the growth of the shoot below it on the stem).
Flower formation.
Fruit set and growth.
Indeterminate root formation.
Growth hormone is the active ingredient in most rooting compounds, into which plugs are dipped during nutritional propagation.

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Stimulates cell division and elongation, breaks seed dormancy and accelerates germination. Some varieties of seeds are difficult to germinate; you can start using them by soaking them in a GA solution.

 

Cytokinins

Unlike other hormones, cytokinins are found in plants and animals. They stimulate cell division and are usually included in sterile media used to grow plants from tissue culture. If the mixture of growth regulating compounds in the medium is high in cytokinins and low in growth hormones, the tissue culture explants (small plant parts) will produce a large number of shoots. 

 

Ethylene is unique in that it exists only in the gaseous form. It induces maturation, causes leaf droop (epinasty) and decline (abscission), and promotes senescence. Plants often increase ethylene production in response to stress and high concentrations of ethylene are usually found in cells at the end of plant life. 

 

Abscisic acid

Abscisic acid (ABA) is a universal plant growth inhibitor. It induces dormancy and prevents seed germination; causes leaves, fruit and flowers to fall off; and causes stomata to close. High concentrations of ABA in guard cells during drought stress may play a role in stomatal closure.