What is phototropism? Name any plant hormone that controls phototropism.
What is phototropism? Name any plant hormone that controls phototropism.
“Photo” means light, and “tropism” means turning. Phototropism is the phenomenon by which the plant bends in the direction of light. Light is required by the plants to stimulate energy production through the process of photosynthesis. The hormone called auxins that are present in the cells, respond to photosynthesis and react to produce more protein and generate energy for the plant. Almost all plants respond to photosynthesis in order to get more nutrition and energy. The stem and shoots usually react to positive phototropism by turning towards the sunlight, while negative phototropism takes place in the roots which turn away from the source of light. Here gravitropism or geotropism plays a major role in their growth. Phototropic movement in plants in response to light is stimulated by the concentration of auxin, the plant growth hormone. Phototropism refers to the movement of a plant or any other organism in response to light. This movement can either be towards the light or away from the light. Auxin is mostly produced in the apical meristem of shoots, young leaves, and seeds. The movement of auxin is unidirectional or polar, it moves downwards from its site of production. Polar transport results in an auxin concentration gradient, which stimulates specific responses. Auxin-specific transport proteins in the plasma membrane control the movement of auxin out of the cell. Plant hormones act by signal transduction, eliciting more than one cellular response. Auxin binds to enzyme-linked receptors, which promotes the catalysis of a reaction. When auxin binds to a receptor, it initiates the binding of a repressor protein for certain genes (auxin response gene) to ubiquitin, resulting in the degradation of repressor protein and the transcription of auxin response genes progresses leading to cellular growth and development.
“Photo” means light, and “tropism” means turning. Phototropism is the phenomenon by which the plant bends in the direction of light. Light is required by the plants to stimulate energy production through the process of photosynthesis. The hormone called auxins that are present in the cells, respond to photosynthesis and react to produce more protein and generate energy for the plant. Almost all plants respond to photosynthesis in order to get more nutrition and energy. The stem and shoots usually react to positive phototropism by turning towards the sunlight, while negative phototropism takes place in the roots which turn away from the source of light. Here gravitropism or geotropism plays a major role in their growth. Phototropic movement in plants in response to light is stimulated by the concentration of auxin, the plant growth hormone. Phototropism refers to the movement of a plant or any other organism in response to light. This movement can either be towards the light or away from the light. Auxin is mostly produced in the apical meristem of shoots, young leaves, and seeds. The movement of auxin is unidirectional or polar, it moves downwards from its site of production. Polar transport results in an auxin concentration gradient, which stimulates specific responses. Auxin-specific transport proteins in the plasma membrane control the movement of auxin out of the cell. Plant hormones act by signal transduction, eliciting more than one cellular response. Auxin binds to enzyme-linked receptors, which promotes the catalysis of a reaction. When auxin binds to a receptor, it initiates the binding of a repressor protein for certain genes (auxin response gene) to ubiquitin, resulting in the degradation of repressor protein and the transcription of auxin response genes progresses leading to cellular growth and development.
