What are common symptoms of growth regulator usage in plants?

Twisting of stems and petioles is a common symptom associated with the use of growth regulators in plants. Growth regulators, which include substances that can promote or inhibit growth processes, often affect the cellular division and elongation rates in various parts of the plant. This can lead to abnormal growth patterns such as twisting or curling, particularly in stems and petioles, impacting the overall morphology of the plant.

In contrast, while options related to increased flower production, enhanced root development, and brightening of leaf color can occur due to various growth influences, they are not specific and prominent symptoms typically associated with growth regulator usage. Increased flower production can be influenced by other factors such as nutrient availability or environmental conditions, enhanced root development is more closely linked to rooting hormones rather than growth regulators, and brightening leaf color may be related to other physiological processes, rather than a direct effect from growth regulators.