3 examples of physiological processes regulated by plant hormones
1. Growth and development: Plant hormones, such as auxins, gibberellins, and cytokinins, are involved in regulating various aspects of plant growth and development. For example, auxins control cell elongation and differentiation, gibberellins stimulate stem elongation, and cytokinins promote cell division and differentiation.
2. Flowering: Plant hormones, particularly gibberellins and cytokinins, play a critical role in regulating flowering in plants. Gibberellins promote the elongation of the stem, while cytokinins control the formation of floral organs. The balance between these hormones determines the timing and success of flowering.
3. Responses to environmental stimuli: Plant hormones are crucial in mediating the response of plants to various environmental stimuli. For instance, abscisic acid (ABA) is involved in stomatal closure, reducing the water loss during drought conditions. Ethylene regulates fruit ripening and senescence. Additionally, auxins and gibberellins are involved in tropic responses, allowing plants to orient themselves towards or away from certain stimuli, such as light or gravity.