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Question
The PGR, ethylene, could fit either the groups- plant growth promoters and inhibitors but it is largely an
The PGR, ethylene, could fit either the groups- plant growth promoters and inhibitors but it is largely an
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Solution
The correct option is D Inhibitor of growth activities
Regulators which inhibit plant growth by initiating growth inhibiting activities, such as plant growth, seed germination etc. as well as promoting seed dormancy, senescence and abscission are known as growth inhibiting regulators.
Ethylene and abscisic acid are the two phytohormones having growth inhibiting effects.
Ethylene: Growth regulating activities
Ethylene has both types of activities: Growth promoting and growth inhibiting.
Its growth promoting or growth inhibiting activities and senescence promoting actions depend on its concentration, timing of application as well as the plant species.
Though it has growth promoting actions, however, it majorly leads to inhibition of growth activities
Ethylene: Growth inhibiting activities
Some of the growth inhibiting activities of ethylene are as follows:
●Promotion of senescence of plant parts
●Promotion of abscission of plant parts
●Thinning of plant parts
Thinning of plant parts has agricultural utility. It is mediated by the application of ethephon (the most widely used source for release of ethylene). Thinning means reduction of the number of fruits or other plant parts, which helps the remaining ones to attain better growth and size.
Regulators which inhibit plant growth by initiating growth inhibiting activities, such as plant growth, seed germination etc. as well as promoting seed dormancy, senescence and abscission are known as growth inhibiting regulators.
Ethylene and abscisic acid are the two phytohormones having growth inhibiting effects.
Ethylene: Growth regulating activities
Ethylene has both types of activities: Growth promoting and growth inhibiting.
Its growth promoting or growth inhibiting activities and senescence promoting actions depend on its concentration, timing of application as well as the plant species.
Though it has growth promoting actions, however, it majorly leads to inhibition of growth activities
Ethylene: Growth inhibiting activities
Some of the growth inhibiting activities of ethylene are as follows:
●Promotion of senescence of plant parts
●Promotion of abscission of plant parts
●Thinning of plant parts
Thinning of plant parts has agricultural utility. It is mediated by the application of ethephon (the most widely used source for release of ethylene). Thinning means reduction of the number of fruits or other plant parts, which helps the remaining ones to attain better growth and size.
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