PLANT PHYSIOLOGY
PLANT GROWTH
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Gibblerin
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Auxin
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Ethylene
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Cytokins
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Detailed explanation-1: -Auxins, cytokinins, and gibberellins delay abscission; ABA and ethylene commonly accelerate abscission. Growing leaves with high levels of auxins, cytokinins, and gibberellins do not abscise, but when levels of these hormones decrease, the leaves begin to senesce and eventually abscise.
Detailed explanation-2: -SHOOT-DERIVED AUXIN CONTRIBUTES TO ROOT ORGANIZATION Auxins, a class of essential plant hormones, orchestrate almost every aspect of plant growth and development (Woodward and Bartel 2005; Vanneste and Friml 2009).
Detailed explanation-3: -Answer: Auxin promotes cell growth and elongation of the plant. In the elongation process, auxin alters the plant wall plasticity making it easier for the plant to grow upwards. Auxin also influences rooting formations.
Detailed explanation-4: -Important roles in timing of abscission have been assigned to the plant hormones ethylene and auxin. La Rue (1936) showed that removal of the leaf blade induces abscission; but when auxin is applied to the site of removal, abscission is inhibited.