Plant nastic movement

1. NASTIC
MOVEMENT
จัดทําโดย
น.ส.อรณิศวร์ เจียมศรีพงษ์
ม.6 ห้อง 155 เลขที 23
THIGMONASTY
MOVEMENT
The non-directional movement of a
plant in response to the contact of an
object is called Thigmonasty
movement. In the insectivorous plant’s
leaves like Drosera, Dionaea the
tentacles show variation in movements
on coming in contact with an insect.
The stimulus touch of an insect is
transmitted to the entire leaf and all the
tentacles bend over the insect.
From the above article it is clear that
plants do not show locomotion i.e. they
don’t move from one place to another,
but there are certain movements
shown by some parts of the plants
which may or may not be categorized
as growth movement.
NYCTINASTIC
MOVEMENT
This movement is caused due to the
variations in light and temperature. It is
also known as Sleeping movement. It
can be classified under Photonastic
and Thermonastic movement. It is seen
in leguminous plants. The leaflets fold
in the evening and open up in the
morning.
SOURCES :
Shikha Goyal. (2018). What is Nastic
movement in plants. Retrived May 29,
2021, from
https://www.jagranjosh.com/general-
knowledge/what-is-nastic-movement-in-
plants-1516350600-1.
Pathwatz. NASTIC RESPONSES.
Retrived May 29, 2021, from
https://www.pathwayz.org/Tree/Plain/N
ASTIC+RESPONSES
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2. WHAT IS NASTIC
MOVEMENT?
The movement of a plant part
in response to an external stimulus
in which the direction of response is
not determined by the direction of
stimulus is known as Nastic
movement. It is also known as
Nasties. The stimuli may be
classified as light, heat, touch or
contact, etc. Nastic movement is not
a directional movement of the plant
part with response to the stimulus.
In nastic movement, it affects
all the parts of the organ of a plant
equally and they always move in the
same direction. This movement
takes place in the flat organs of the
plant like leaves, petals of flowers
etc.
There are five types of Nastic
movements in plants.
The non-directional movement of a plant
part usually in the petals of flowers in
response to light is photonasty
movement. The stimulus in Photonasty
is light. Many petals of flowers open in
the daylight and closed in the evening in
response to the intensity of light. This is
a growth movement in plants and an
example of Photonastic movement.
Examples are: Dandelion flower,
Moonflower, flower of Cestrum
Nocturnum etc.
PHOTONASTY
MOVEMENT
Such movements in plants occur due
to the change in temperature. Flowers
of a plant open with the rise in
temperature and close with a drop in
temperature.Sometimes Thermonastic
movement is associated with
Photonastic movements also. In these
both, the response mechanism is
related to the growth, changes in the
turgor on upper and lower sides of the
petiole, leaf blade etc.
THERMONASTIC
MOVEMENT
SEISMONASTIC
MOVEMENT
This type of movement is caused by
the mechanical stimuli like shock,
touch or contact, fast moving wind,
rain drops, etc. In some parts of plants
Seismonastic movement is seen in the
stigmas, stamens and leaves.
Example: Mimosa Pudica plant,
Biophytum sensitivum, Neptunia etc.
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WHAT-A-PLANT-KNOWS/