Cytokinins - Plant growth and development, Biology, Class 11 Video Lecture

hello friends this video on plant growth
and development part 12 is brought to
you by exam for calm no more fear from
exam so that's all about your balance
now we'll talk about the third plant
hormone as side 2 onions so so let's see
how we're cytokinins discovered and why
are they called site openings now the
term cytokinins is derived from the word
cytokine menses and cytokinesis means
cell division cyto means cell kinase
kinase systems from the word kinetic
that is movement so altogether
cytokinesis means cell division so cycle
violence has to do something with cell
division basically they promote cell
division now how it was discovered was
that scientists were trying to grow the
shoes in Patrol to generate the whole
plant but that was not becoming possible
now they tried making different things
they added all the minerals and
everything so somehow they could grow
some issues but those tissues lasted
only for some time and then they finally
could not get a plant so that tissue has
to survive for a longer time so that it
can actually give rise to a plant right
but that never happened but then finally
it was observed that other than the
components like the minerals and the
vitamins which are needed for plant
growth they added another component
which actually helped in regenerating
the entire plant and what was that
additional component that additional
component was coconut milk so coconut
milk was that additional component which
helped in generating the whole plant and
then later it was found that the magic
ingredient of the coconut milk was
nothing but another group
promoting hormone which is which
actually promotes cell division so Fox
who was the scientist who identified for
the first time cytokinesis promoting
substance and he named it connection at
that time but then later it was known as
cytokine means so this happened the SPOC
scoob's incident happened long time back
it happens of around 2000 so this is how
cytokine was discovered so cytokine he
was basically another plant growth
promoting hormone which is required
along with bugs in for the growth of the
plant so oxen alone also could not in
this tissue culture aux-in was already
present but still the whole ton could
not be regenerated so the plant could be
generated only when psychic I mean was
also added along with oxen okay so now
what are cytokinins now they are growth
promoting plant plant hormone both
naturally occurring as well as synthetic
cytokinins exist if you talk about
naturally occurring cytokine in eggs an
example would be Seattle so Seattle is
the naturally occurring cytokine in
which whose structure looks somewhat
like this so if you talk about the
synthetic sign of essential findings an
example would be back PAP what does BMP
it is six pens I amino purine that a six
benzine amino purine so this is a
synthetic cytokine so whenever I say
synthetic that means it is artificially
prepared so the natural cycle violence
for example reaction they are
synthesized in those regions where rapid
cell division occurs now can you think
of some of the regions in the plan
and division occurs exactly the ethical
regions the root epochs or in the young
fruits which wears fast cell division
occurs and the fruit actually become
grooves bigger in size and it matures so
these are some of the regions where a
lot of cytokines are synthesized now let
us discuss the role which they came
of course they promote cell division and
that is why they are known as micro
canyons they promote natural shoot
growth so if you see that is why they
compliment comes in because cobs it
helps to promote the vertical growth but
when you talk about the overall growth
of a plant we do not only talk about the
vertical growth but the lateral truth as
well you don't not only want the plant
to prove the space you also wanted to
prove this way also now as we saw exams
from the vertical growth alone it
doesn't promote the lateral growth so
cytokine means promote the lateral
growth and that is wise oxide insightful
climbing together can give a very good
growth to the trance so cytokines can
overcome apical dominance so augs in
scores apical dominance because of
audience a pickle dominance phenomenon
is seen and cytokine is a solution to
apical dominance so if both of them are
present in the right amount then I mean
the overall growth can be taken care of
its helps to over apical dominance delay
senescence so this also helps to deal
the aging implants now how a gene is
aging is that it helps to transport
nutrients properly to different parts of
the plant now when a particular part of
the plant is receiving a lot of
nutrients it stays healthy and it is
aging can be delayed so it regulates the
transport of nutrients so that we cycle
also plays important roles in the growth
of a plant so with this I think we have
covered all the growth promoting
hormones that is obscene gibberellins
and cytokinins so thinking about herbs
in it is primarily required for vertical
growth of the plant when we talk about
psycho mind it is primarily required for
the lateral growth of the plant
when you talk about Jumeirah lean it is
finally used for stem elongation delay
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