Ep. 04 The Roots of the Gravity Problem (Part 02) – The Astrobotany Show


guys I’ve got some I’ve got some bad news for you today this may come as a disappointment
to some of you you may notice that… I’m missing my chain
* the BIG reveal * *abrupt musical interlude * I forgot it today
I’m sorry I’ve let myself down I’ve let you down if you came
just to see the gold chain stop watching now,
I’m sorry Gardens and nobody can stop me young
this girl plants in space welcome to the Astro Bonnie show I’m
your host sky Rasmussen and this week we’ll be starting where we left off how
do plants know what direction to grow and how do they know what direction to
grow in outer space if we’re going to start talking about plant gravitropism
or how a plant responds to gravity we’ll have to talk about some of the science
behind it I’m sorry guys is just no avoiding it because that’s where all the
action happens the good place to start is in the roots all right there we go this poor plant that I just ripped out
of the soil is mizuna it’s a type of East Asian lettuce and it is in the
Brassica family it’s also a NASA target crop which has been grown on the
International Space Station a NASA target crop is a plant variety
that is good for sustenance so mizuna here has a lot of leafy
biomass and it would be a tasty treat for astronauts
this is mizuna lettuce and this is supposed to be a representation of a
single plant cell specifically in the roots as you may know the cell has many
different compartments you’ve probably heard of the phrase the mitochondria is
the powerhouse of the cell well there’s another part of the cell that’s called
the Amaya last I’d like to say that the mi Laplace
the gravity sensors of the cell I won’t get too much into this but all you need
to know is that when the plant cell turns the amayal PLAs are affected by
gravity and they rotate in whatever direction that they go in the plant
grows the plant roots actually reorient themselves to grow downwards let’s take
a look at this video of auxin spreading through the root tip you can see that
it’s accumulating at the bottom oxen is a plant growth hormone that drives
growth in a plant so obviously the question is how does this affect plant
growth in space alright guys it’s time to check it check this out this is one
of the first time lapse videos of plants being grown in space
it’s from annalisa Paul and Rob Farrell at the University of Florida space
plants lab on the left are the plants growing on Earth and on the right are
the ones grown in space you can see that in the right petri dish the root growth
is erratic and actually the paper that was written about this asserts that in
the absence of gravity plants grow towards light here we have another video
of a rabid OPS’s that was grown normally at first but then later tilted at an
angle you can see how the influence of gravity affects the direction that it
grows in the plant’s response to gravity is just one of the many types of
environmental stress responses that we have to consider as Astro botanists when
we grow plants in space this effect more commonly described as gravitropism is a
critical part of Astro botany research we have to know exactly how gravity
affects the plants on a molecular level and how we can help the roots orient in
a direction that is optimal for nutrient uptake
let’s eat plants and space ah this girl plants and space hey guys
welcome to the Astro botany item of the week where we go over the Astro botany
item of the week this week’s item is the 2-dimensional cleanest at a climate that
is a piece of scientific equipment that rotates a sample in a way that mimics
microgravity or applies a gravitational stressor you can see in the experiment
that we’re running we implants that are being stressed in such a way that their
field of gravity is constantly changing this is like the this is like you can
think of you can think of it as an amusement park for plants except they’re
not enjoying it the reason why we call this a two dimensional kind of sad is
because we also have three-dimensional client assets which rotate on two axes
as opposed to one to achieve a more comprehensive effect
you’re probably wondering Kai why don’t you just send plants to space whenever
you want to perform a gravity experiment well let me tell you something to send a
plan to space you need one of these things a rocket and to get one of these
things need a little bit of this and I’m no rocket scientist but I bet that a
rocket costs more than ten dollars and that’s the reason why we use a client
set to test plants under gravity stress see you next week
let’s go plants and space you have any questions about Astro botany feel free
to let us know in the comment section below or if you just want a more
in-depth explanation find ceilings to shatter