commercial use of plant hormones Flashcards
(9 cards)
1
Q
what hormone is used commercially for ripening?
A
- the gaseous hormone ethene
2
Q
How is ethene used commercially?
A
- fruits are picked when fully formed but unripe
- transported unripe (hard, less prone to damage)
- ripened by exposure to ethene gas under controlled conditions
- increases time available for them to be sold
- prevents waste during transport
3
Q
What is the effect of using auxins on cut shoots?
A
- stimulates root growth
- allows new plants to be propagated from cuttings/tissue culture
4
Q
What hormone is used in weedkillers?
A
- synthetic auxins
5
Q
How are synthetic auxins used as a weedkiller?
A
- staple foods such as rice, maize and wheat are narrow-leaved monocot plants.
- most weeds are broad-leaved dicot plants
- Synthetic dicot auxins can be sprayed over the crops. these will be absorbed by the dicots, affecting their metabolism and increasing growth so much they die.
- low toxicity to mammals, selective
6
Q
what hormone can be used in the production of seedless fruit?
A
auxins
7
Q
what hormone can be used to promote fruit dropping?
A
ethene
- cherries, walnuts, cotton
8
Q
What are the roles of cytokinin in plants?
A
- prevent ageing of ripened fruit.
- used in micropropagation
9
Q
What are the commercial uses of gibberellins?
A
- delay ageing and ripening
- improve size and shape of fruit
- speed up malting process in beer brewing
