Nastia is defined as a temporary movement that occurs in some plant-type organs produced as a result of diffuse and external stimulation . This stimulation is based on growth processes , although it can also be due to a change in turgor in the cells that cause variations in their volume by controlling the water inlet and outlet.

These movements that occur respond to a stimulus , are active and reversible, directly affecting organs such as leaves, petals, branches, among others.

Depending on the stimulus that excites the plants to perform certain movements, they can be classified into various types of nastia.

Examples of Nastia

1. Photonastia

It is the response to light intensity , as a result of which many flowers open and close. Including the morning glory, which is known to open its flowers at night and close during the day. In photonasty stimuli come exclusively from external contact with a light source.

2. Chemionastia

In this case, it is the movement response that occurs in the presence of chemical substances, as in carnivorous plants that trap insects .

3. Sismonastia

Systonia refers to the response obtained to mechanical or contact stimuli, which can be when the leaflets are closed, such as the position in which the leaves fall from the mimosa puidica or at the moment in which it is shaken or tapped gently.

4. Gravinastia

It refers to the action that plants experience, which is known as positive and negative gravity. In the case of positive gravity, it occurs when the leaves of the plants move downwards due to gravity .

The negative gravinastia on the contrary, is the increasing trend and the stem upward generating a movement in opposite direction of gravity.

5. Hydronastia

Basically it is the response of plants to the humidity that is present in the environment. Like what occurs when the sporangia open in the case of ferns.

6. Geonastia

It is a nastia generated as a consequence of the action of gravity and the physiological dorsiventrality of plant organs.

7. Haptonastia

It is a contact response, like that obtained with the tendrils of many plants.  The way in which the reaction to the stimulus is generated occurs in a greater growth of the flank opposite the contact.

8. Nictinastia

In this case it is a nastia that has to do with the stimulus that causes the movement. It is the day-night sequence and the answer is the position of the leaves.

9. Traumatonastia

It is the response that occurs as a result of an injury or what occurs as a result of it.

10. Thermonastia

It is the response that occurs to all variations in temperature including things like the closing of the tulip flower for example.