Oh in today's video we're gonna look at how three plant hormones aux-in gibberellin and Ethan can be used commercially to bring about changes in plants start with auctions were a judge type of growth hormone because they stimulate plants to grow if we purposely add organs to plant cells we can stimulate growth for example if we had a collection of plant cells in a tissue culture we could grow lots of plant clones by using a growth medium that contains auxin in addition to the other nutrients that the plants would need the same process works with cuttings which are small sections of a plant that are being cut off like the end of a branch with a few leaves if we place these in soil by themselves they normally won't do anything but if we add a routine powder which when Taine's auxin then they'll produce roots and start to grow into a new plant you the final use of auctions is that we can use them to kill weeds this might sound a bit counterintuitive as auctions stimulate growth but basically if you add enough of them it can completely disrupt a plant's growth patterns which causes it to die luckily for us most weaves are a type of plant called broad-leaved plants whereas most commercial plants like cereals are narrow leaved this means that we can develop selective weed killers now we can spray everywhere but only kill the broad-leaved weeds next up we have gibber ellen which also has three main uses controlling dormancy inducing flowering and growing larger fruit if you think of a seed sitting in a soil it won't germinate and start growing until the conditions are just right for example the white levels of warmth oxygen and water and we call this period before growth starts dormancy by exposing the seeds to give Arella new farmers can induce germination at times of the year when it wouldn't normally happen this means they can grow multiple crops per year and also ensure that all the plants start growing at the same and hyman the same thing works for inducing flowering even though flowering normally requires certain conditions to start gibberellin can induce it on demand and also encourage plants to make more flowers or bigger flowers the final use is growing larger fruits this is particularly useful with seedless varieties of fruit which naturally don't grow as large as a seeded relatives but by giving them dipper Ellen we can make sure that their fruits grow well you the last hormone we need to look at is ething which is used to stimulate the ripening of fruit if you've ever noticed how much more quickly some fruit ripens than others you can probably understand how useful it is to be able to control the ripening process it's even more important when you consider that most of our fruit is shipped for weeks across the world before it gets to us by purposely picking the fruits before it's ripe we have enough time to transport it to where it needs to go and once it's there we can expose it to Ethan so that it quickly ripens and is ready for sale most plants naturally produce their own Ethan and we often block its effects while we're transporting it so that it doesn't ripen too early at the cellular level Ethan works by stimulating an enzyme that causes the fruit to ripen anyways that's everything for this video so hope you enjoyed it and I'll see you again soon you