Question

Advanteges and dis advantages of Auxins , gibberrins, ethiline , absicis acid,

Answer 1

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➤ What is Auxins ?

Auxins are a class of plant hormones with some morphogen-like characteristics. Auxins play a cardinal role in coordination of many growth and behavioral processes in plant life cycles and are essential for plant body development

➝ Advantages of Auxin :-

• Auxin is a plant hormone produced in the stem tip that promotes cell elongation.
• Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.

➝ Disadvantages of Auxin :-

• Auxins accumulate on the lower side of the shoot, due to gravity.
• Cells on the lower side grow more quickly. The shoot bends upwards. This is called negative geotropism.

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➤ What is gihbberrins ?

Gibberellins are plant hormones that regulate various developmental processes, including stem elongation, germination, dormancy, flowering, flower development, and leaf and fruit senescence. GAs are one of the longest-known classes of plant hormone.

➝ Advantages of gibberrins :-

• Gibberellins are sometimes used to increase the amount of a -amylase in germinating barley (Hordeum vulgare) which is used in production of malt for brewing industry.

➝ Disadvantages of gibberrins :-

• Gibberellins are produced in greater mass when the plant is exposed to cold temperatures.
• They stimulate cell elongation, breaking and budding, seedless fruits, and seed germination.
• Gibberellins cause seed germination by breaking the seed's dormancy and acting as a chemical messenger.

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➤ What is ethylene ?

Ethylene plant growth substance (phytohormone, plant hormone), involved in promoting growth, epinasty, fruit ripening, senescence and breaking of dormancy. Its action is closely linked with that of auxin.

➝ Advantages of ethylene :-

• Ethylene is also an important natural plant hormone and is used in agriculture to force the ripening of fruits. The hydrate of ethylene is ethanol.
• ethylene was used medically as a anesthetic in concentrations significantly greater than that found in a ripening room.

➝ Disadvantages of ethylene :-

• Ethylene are to cause vegetables to go yellow, bud damage in dormant nursery stock, drop off of leaves in ornamentals and rapid death of most cut flowers.

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➤ what is absicis acid ?

Abscisic acid (ABA) is often referred to as a inhibitory rather than stimulatory hormone. It is involved in the closure of stomata, bud and seed dormancy and is known to inhibit other hormonal actions.

➝ Advantages of absicis acid :-

• Abscisic acid is a sesquiterpene, which has important roles in seed development and
• maturation, in the synthesis of proteins and
• compatible osmolytes, which enable plants to tolerate stresses due to environmental or biotic factors, and as a general inhibitor of growth and metabolic activities.

➝ Disadvantages of absicis acid :-

• Abscisic acid stimulates the growth and development of the root system including adventitious roots of the hypocotyl
• the formation and growth of the lateral shoots of the cotyledonary node and to a much lesser extent the growth of the main shoots of axenically cultivated 17 days old Phaseolus coccineus seedlings.