Motion in plants is a response to stimuli both from within and from outside the plant. One of the characteristics of living creatures is moving. The movement caused by the stimulation. Plants, although it looks like a dead creature, they are also engaged. But the plant has its own way to move. Motion in plants to be evidence of the presence of irritability (sensitive to stimuli) in plants. Here are various kinds of motion in plants with examples. 13 motion consists of 5 motion nasti, 7. motion tropism, and 1 motion taxis. We just consider the first:
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Motion nasti is motion in plants in response to stimuli, but is not influenced by the direction of arrival of the stimuli. This movement can be caused by changes in turgor in the tissues in the bone leaves. Based on perangsangnya, motion nasti distinguished into several types, namely:
Seismonasti (tigmonasti) is the motion nasti who is stimulated by touch. For example, seismonasti is motion close it leaves Mimosa (Mimosa pudica) when touched.
Niktinasti is the motion nasti that is stimulated by dark. It causes the occurrence of “motion bed” for example, on the leaves of peas at night, and open again at noon.Termonasti is the motion nasti that is stimulated by temperature. Example termonasti is tulips bloom when the temperature is increased. The blooming of the tulips because of the presence of tissue growth under increased but the tissue of the upper part remains. Fotonasti is the motion nasti that is stimulated by the intensity of the light. Example fotonasti is the blooming of the flowers of Mirabilis jalapa on the afternoon of the day when exposed to sunlight.
Nasti Complex is the motion nasti that is stimulated by more than one stimuli. Example nasti complex is the motion of opening and closing the stomata.
Tropism is a biological phenomenon characterized by growth or change in the movement of plants toward the direction of arrival of stimuli as a response to the environmental stimulus. It is opposite to the motion of nasti and is not influenced by the direction of the arrival of the stimuli. Based on the type of stimulate, motion tropism can be divided into several kinds, namely:
Geotropisme is the growth of plant parts in response to the force of gravity. For example geotropism negative is the growth of the shoots above, while the example geotropism positive is the growth of roots decreased.
Phototropism is the growth of the plant parts as a response to the light that came along with him. An example of phototropism is the movement of the rod toward the source of the light of the sun. Tigmotropisme is the movement of part of the plant in response to touch. For example, thigmotropism is a plant climber (it has tendrils) such as grapes, sweet potatoes, melon, etc. Hidrotropisme is the response of plant growth in which the direction of growth is determined by a stimulus or gradient of the water concentration.
For example, hydrotropism is the root of a plant that is always looking for a source of water. Termotropisme is the movement of plants in response to temperature changes. For example, thermotropism is the leaves of rhododendrons which are becoming curly as a response to cold temperatures. Kemotropisme is the growth of plants that navigate by chemical stimuli from the outside of the plant. For example, chemotropism is on the flower changes into the fruit. Reotropisme is the motion tropism that is influenced by the flow of water. Example geotropism is water hyacinth and coral reefs.
Motion taxis is the movement of plants as a response to the stimulus. The difference with the tropism is in motion taxis whole plant body will move and the direction determined by the direction of the stimuli. Motion taxis are generally carried out by the organism low level. Based on the stimulation, here are some of the kinds of motion taxis:
Fototaksis is the motion of whole parts of plants towards or away from light stimuli. Aim to receive the light efficiently for photosynthesis. Examples of motion fototaksis are on the Euglena moves towards the light.