Hatch & Slack Pathway Video Lecture - NEET

hello friends this video on
photosynthesis in higher plants part 22
is brought to you by exam feel calm no
more fear from exam let us now talk
about the ash and slag pathway so hatch
and slag pathway is again the multi-step
process so here also multiple steps are
involved so let us see what are the
steps through which a hatch and slag
pathway happens
carbon dioxide fixation and the
reduction in these OPD cells so these
two steps are little similar to what
happens in case of calvin cycle but it
happens in the mesophyll cells so where
are the musical sense in these things so
here carbon dioxide fixation and
reduction than having transport to
bundle sheath cells so from the musical
cells it will get transported to the
bundle sheath cells so these are the
bundle sheath cells then decarboxylation
in bundle sheath cells in the bundle
sheath cells decarboxylation will happen
and then transport back to these open
cells so you see transport plays an
important role here so transportation
between bundle sheath and musical cells
happen in a hatch and slack pathway so
now we will try to understand each step
in content matter so let us start with
okay and the last step is obviously
regeneration because it is a cycle so it
has to go back to the first step from
where it started so let us start with
fixation in Muzo fuel cells so here what
is the primary carbon dioxide acceptor
lighting Calvin cycle the primary carbon
dioxide acceptor was rubp that
desciption rose by phosphate but in this
case which is a primary carbon dioxide
sector now who should be a guard I
accepted this acceptor will accept
carbon dioxide and it forms a four
carbon organic acid so this is one
carbon so this should be three carbon
that is our assumption now let us see if
the assumption is correct now the
primary carbon dioxide acceptor is PEP
what is PEP it is forceful in all
pyruvic acid and this is a three carbon
compound so this assumption is correct
so this is a three carbon compound so
forceful in all pyruvic acid is the very
primary carbon dioxide accepted here so
in this step what happens there is an
enzyme for pep carboxylase or which is
also one aspect is so this enzyme will
act on this primary carbon dioxide
accepted pep and this will result in the
formation of a four carbon compound
what is the four carbon compound that is
augs and acetic acid which is a four
carbon compound so what happens it
starts with pen which is possible in all
vionic acid and this takes in carbon
dioxide and it forms of Zelo acetic acid
so this is the three carbon compound and
business a full carbon compound and
where does this take place the takes
place in the mesophyll cells now here if
you observe the enzyme which is required
aspect carboxyl is so true Bisco is not
required as I mentioned in musical sense
Rubisco is not at all there right so
this is how carbon dioxide fixation will
take place in musical sense now
reduction will happen in his open sense
now what do we get we got oxaloacetic
acid which is a four carbon compound
now this observation Pocasset will get
reduced to malic acid and while VALIC
acid is again a four carbon compound and
high-energy electrons of NADPH are
utilized in this step so in this case
what will happen in the previous step of
zero acetic acid which was a four carbon
compound was formed now this will get
reduced to malic acid so this reduces to
matic acid which is again a four carbon
compound now invite this conversion for
this reduction to take place it will
utilize the I energy electrons of NADPH
so this NADPH will get converted to
nadp+ and those high electron energy
electrons will be utilized for this
reduction the enzyme which is involved
in this process as Malik dehydrogenase
this is the enzyme involved chip
now the manic acid which is produced now
this is also produced in the musical
sense it is produced in the musical
cells but now the malic acid will be
transported to bundle sheath cells so
till now we where in the means o field
cell this was being so concerned and now
it will suppose this is your
plasmodesmata and from here starts the
bundle sheath cells so what will happen
this malic acid will get transported
into the bundle sheath cells now bundle
sheath cells is the one which has
Rubisco enzyme so in bundle sheath cells
Calvin cycle campaign please right now
let us see what happens to the malic
acid after it gets transported to the
bundle sheath cells now again a fixation
will happen in the bundle sheath cells
let us see what happens the matic acid
is decarboxylated
to pyruvic acid so malic acid which is
the four carbon compound will get
decarboxylated
means carbon dioxide will be removed
from malic acid so one Kalkan will be
removed so it will become a three carbon
compound that is pyruvic acid so as i
mentioned before so right now we are in
the bundle sheath cells we have come out
of the means open cells so here the
power malic acid has entered and this
magic acid now gets converted into
pyruvic acid so the Manek acid was a
four carbon compound and this pyruvic
acid is a three carbon compound so
decarboxylation is just the opposite of
carboxylation carboxylation means adding
carbon dioxide and decarboxylation means
removing it so the enzyme which is
involved here is malik enzyme so please
remember the names of the enzyme so that
you know which the enzyme is involved in
with step so their product here is
pyruvic acid and also co2 as I said
decarboxylation means carbon dioxide is
removed so carbon dioxide is released so
carbon dioxide is also a byproduct of
this step now what happens to this
carbon dioxide and what happens to the
pyruvic acid now an important point to
be noted here is that this car-bombs
carbon dioxide which is produced here
this carbon dioxide enters the Calvin
cycle for Calvin cycle to take place
what do you mean the first step of
calvin cycle is carbon dioxide fixation
now in case of c3 plants that carbon
dioxide used to come from the atmosphere
but here in these of c4 plants the
carbon dioxide for kal
cycle will come from the c-4 pathway so
this carbon dioxide will be used up in
the Calvin cycle and then the Calvin
cycle will also take place in these
tails and as a result of Calvin cycle
sugar will be produced that is why I
told that even in c4 plants the main
pathway which results in the formation
of sugar is Calvin cycle and not the
hatchet slag pathway so hatch and slag
pathway only provides carbon dioxide for
the calvin cycle to start in the bundle
sheath cells because here in the musical
cells we do not have the required enzyme
that is Rubisco is missing in the me so
consents that is why it repairs
something else in the musical cells
transfers it to the bundle sheath cells
then produces carbon dioxide which is
able to initiate the Calvin cycle clear
ok so now this carbon dioxide is
utilized for c3 pathway c3 pathway is
nothing but a Calvin cycle and this
Calvin cycle will result in the
synthesis of sugar so please have a
clear understanding of this that in c4
plants c4 pathway will take place as
well as Calvin cycle will take place but
Calvin cycle will take place only in the
bundle sheath cells therefore first the
entire process will start as hatch and
slag pathway in the musical sense then
they will produce malic acid and the
pelagic acid will enter into the bundle
sheath cells through the plasmodesmata
and in the bundle sheath cells carbon
dioxide will be produced which will be
utilized for calvin cycle
so the basic sugars in cases pathway is
back in cycle for all c3 as well as c4
plants now the electrons releases
convert nadp+ back to NADPH now you
remember in the previous step in the bun
in the musical cells NADPH was utilized
for many dp+ now here during this step
when this step occurs some electrons are
released which converts nadp+ back to
nad place so that whatever electrons
were taken up that time will now be
given back now pyruvic acid which is
produced is transported back to you so
fuel cells to plasmodesmata again you
have the musical cells here and this is
the plasmodesmata right this is nice
open sense and this is bible sheet so
now this pyruvic acid which is formed
here this pyruvic acid will be sent back
to the last bonus matter into the visa
fill layer so the purpose of the entire
cycle entering into the bible cell is to
provide the carbon dioxide and initiate
the calvin cycle now what happens to
this pyruvic acid let's see that is the
last step that is regeneration musical
sense now again we are into the musical
cells and now we are left with pyruvic
acid in the musical sense so this is
this was your balance sheet and this is
your musical this is plasmodesmata so
now what happened the pyruvic acid has
entered back to the mesophyll cells so
this pyruvic acid will now be
phosphorylated to form b e b that is
false going in all backward
that is the first or the starting step
of the c-4 cycle now by which process by
phosphorylation that is it will utilize
ATP and ATP will get converted into adp
and this extra phosphate will get get
added to pyruvic acid to form PEP so bio
big acid was a three carbon compound
right and this PEP which is formed what
is it this is again a three carbon
compound only the phosphate will
increase it here so that is how the
cycle
completely because this is where the
photography started from here only in
started right so this is the entire
hatch and slack pathway so here the
enzyme which helps in the conversion of
pyruvic acid to PvP is pyruvate diamines
ATP molecules are utilized in this step
as I mentioned before so here also if
you look at the entire hatch and slack
pathway you will see that ATP molecules
are utilized at this step
NADPH molecules were also utilized in
the reduction step right now let us
quickly have a quick review of the
entire process which we discussed so far
so here you can see this is the musical
cell light green color and the dark pink
color is the bundle Sheikh said now what
happens the process starts at the
musical cell where atmospheric carbon
dioxide is taken in and carbon dioxide
fixation will take place so the first
thing from where the process starts is
the phosphoenol pyruvate or PEP
so PEP is the starting point
so this PEP will take in carbon dioxide
or carboxylation will take place and
this will form of zero acetic acid the
c-4 acid for carbon present is auxiliary
acetic acid this auxiliary acetic acid
will get converted into malic acid and
the malic acid will be transported
through the plasmodesmata into the
bundle sheath cells now here in evidence
she says a valid acid will my Delco
decarboxylation so this was my lead acid
this c4 acid alpha decarboxylation it
will form a c3 acid that is pyruvic acid
and it will also release co2 so this co2
will start the calvin cycle and it will
this will start the process of calvin
cycle and from
and cycle glucose we'll listen cos iced
and the remaining pyruvic acid will
again go back to the musical sense
through the glass bonus matter in the
main vocal cells again it will
regenerate to form PEP in presence of an
enzyme vampire movie guidance and during
this process ATP will be utilized so
this is the to entire process of hacks
and slack pathway which is again a
cyclic process so I hope now it is clear
water c4 plants and water c3 turns what
are the differences in the process of
photosynthesis in case of a c3 lamb and
a c4 plant thank you please visit
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