Commercial uses of plant hormones Flashcards
(14 cards)
How does Auxin help with getting rid of the broad-leaved plants in fields of crops or in a lawn ?
Selective weedkillers have been developed using oxygen, which only affect the broadleaved plants.
How do weed killers using Auxin work ?
they disrupt their normal growth patterns, which kills them, whilst leaving the grass and crops untouched.
How does Auxin help with growing from cuttings with rooting powder ?
If you add rooting power, which contains auxins to the end of a branch with a few leaves on it and stick it in soils. They will produce roots rapidly and start growing as new plants
How is auxin helping with growing from cutting with rooting powder create an advantage for farmers ?
It enables growers to produce lots of clones of a really good plant very quickly
Tissue culture can be used to grow clones of a plant from a few of its cells. How does auxin help with this ?
The process of growing cells in tissue culture requires hormones such as auxins to be added to the growth medium to stimulate the cells to divide to form both roots and shoots
What does Gibberellin stimulate ?
Seed germination, stem growth and flowering
What is dormancy ?
Certain conditions that seeds need to germinate
How does Gibberellin help with dormancy ?
Seeds can be treated with gibberellin to alter dormancy and make them germinate at times of year that they would normally
What else does using gibberellin for altering dormancy help with ?
It also helps to make sure all the seeds in a batch germinate at the same time
What is Ethene ?
A gas produced by ageing parts of a plant
What does Ethene help with ?
It influence the growth of the plant by controlling cell division.
It also stimulates enzymes that cause fruit to ripen
When is ethene used ?
Commercially, it can be used to sped up the ripening of fruits - either while they are still in the plant or during transport
What does Ethene mean for supermarkets ?
The fruit can be picked while it’s still unripe (therefore firmer and less easily damaged) and the gas is then added to the fruit in the way to the supermarket so it is perfect jus is time for the shelves
How can ripping be delayed while the fruit is in storage ?
By adding chemicals that block ethene’s effect on the fruit or reduce the amount of ethene that the fruit can produced. Alternatively, some chemicals can be used that react with ethene to remove it from the air
