Gravitropism
Gravitropism (pronounced: gra-vi-tro-pism), also known as geotropism, is a biological phenomenon that involves the growth or movement of plants in response to gravity.
Etymology
The term "gravitropism" is derived from the Latin word "gravitas" which means weight, and the Greek word "tropos" which means a turning.
Definition
Gravitropism is a directional growth process in which the plant orients itself in response to the force of gravity. This process is essential for the correct positioning of plant organs and plays a crucial role in the plant's ability to propagate and survive.
Mechanism
The mechanism of gravitropism involves the sedimentation of statoliths, dense particles, in the direction of the gravitational pull. This sedimentation triggers a signal transduction pathway leading to differential growth and the bending of the plant organ.
Types of Gravitropism
There are two main types of gravitropism:
- Positive Gravitropism: This occurs when parts of the plant grow towards the gravitational pull. This is commonly seen in roots.
- Negative Gravitropism: This occurs when parts of the plant grow away from the gravitational pull. This is commonly seen in stems.
Related Terms
- Phototropism: The growth or movement of a plant in response to light.
- Thigmotropism: The growth or movement of a plant in response to touch or contact.
- Hydrotropism: The growth or movement of a plant in response to water.
See Also
External links
- Medical encyclopedia article on Gravitropism
- Wikipedia's article - Gravitropism
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