What is hydrotropism?
What Does hydrotropism Mean
In the field of biology , the idea of tropism is used to refer to the movement that plants make in response to a stimulus from outside. Depending on the nature of the stimulus, tropisms are classified in different ways.
The hidrotropismo is the response of the plant to a water stimulus . This tropism is usually reflected in the growth of the roots guided by the availability of water .
Terrestrial plants, in fact, can survive thanks to the adaptive capacity that the development of hydrotropism supposes. This response allows its roots to absorb the water found in the soil .
In this case, the hydrotropism is positive : the roots grow towards the area where they detect a higher level of relative humidity. The organism, therefore, reacts positively and moves towards the water.
The negative hidrotropismo , however, implies the opposite. The roots, in this framework, grow away from moisture .
In this process the hormones called auxins are key because they indicate to the roots how they should be oriented towards the water. The root cap, by capturing the water, sends a signal to the longest sector. The root hairs allow the absorption of the moisture found.
It is important to note that hydrotropism allows the plant to orient itself towards the water a few millimeters, but not more. This means that the specimen is not in a position to detect water at a great distance or to alter its growth considerably to reach it.
On the other hand, the growth towards the ground of the roots is determined by another tropism : gravitropism , a response to the force of gravity.
It is very common that in our language we confuse certain concepts or that we accept certain myths as truths despite not having enough information to contrast them. Hydrotropism also suffers from this distortion of reality due to inaccurate data that is passed on in word of mouth. One of the misconceptions is that hydrotropism is the reason why roots develop more intensively in humid areas than in dry areas.
Hydrotropism can get a root to approach a more humid soil area, but it does not take place before the plant is born, so its birth site is not related to this phenomenon . On the other hand, it is natural for plants to proliferate more if they have the amount of liquid they need to develop, although this value is different in each species.
Another of the erroneous data that some spread about hydrotropism is that the roots can detect water even through the walls of a pipe. This is false, although it usually happens that they take advantage of small cracks to reach the water. Anyway, as mentioned in a previous paragraph, the maximum distance of this rotational movement is very small.
One of the most valuable lessons that we can obtain through the observation of hydrotropism is that plants are also alive and we must respect them, even if we use them to feed ourselves and cure diseases. We can understand that they are a resource made available to all animals, but that does not give us the right to kill them if we do not need them.
Thanks to hydrotropism, plants take advantage of water, one of their most precious resources, in a much more efficient way than if they remained static throughout their development . Each ecosystem provides its individuals with different possibilities, and the key to subsistence always lies in adaptation, a subject that humans are not particularly good at.