plants response to the environment
- Created by: olivia johnson
- Created on: 02-05-13 09:04
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- plant hormones and responding to the environment
- auxins
- promote cell elongation
- inhibit growth of side shoots
- apical dominance
- the growing apical bud inhibits growth of lateral shoots
- this is so that plant can maximise area exposed to sun
- if apical bud broken off, side shoots begin to grow
- this is so that plant can maximise area exposed to sun
- if apical bud broken off, side shoots begin to grow
- EVIDENCE: when medium containing auxin is placed on tip of plant with bud removed lateral bud growth stops
- EVIDENCE: when auxin transoprt inhibitor applied above latteral bud but below apical bud, latteral buds grew
- abcisic acid and auxins work together
- SYNERGISTIC
- cytokinins and auxin work against each other
- ANTAGONISTIC
- the fall of auxins in leaf absicion causes production of ethene which encourages absision
- ANTAGONISTIC
- the growing apical bud inhibits growth of lateral shoots
- apical dominance
- inhibit abscission
- increases the stretchiness of cellulose cell wall by encouraging active transport of hydrogen ions into the cell
- this means that pH is lower and is optimal for wall-loosening enzymes(expansins)
- hydrogen ions disrupt hydrogen bonds in the cell wall while expansins break bonds within the cellulose
- cytokinins
- promote cell division
- giberellins
- promote seed germination
- promotes growth of cells
- ethene
- promotes fruit ripening
- abcisic acid
- inhibits seed germination and growth
- causes stomatal closure when water availiability is low
- apical dominance
- the growing apical bud inhibits growth of lateral shoots
- this is so that plant can maximise area exposed to sun
- this is so that plant can maximise area exposed to sun
- EVIDENCE: when medium containing auxin is placed on tip of plant with bud removed lateral bud growth stops
- EVIDENCE: when auxin transoprt inhibitor applied above latteral bud but below apical bud, latteral buds grew
- abcisic acid and auxins work together
- SYNERGISTIC
- cytokinins and auxin work against each other
- ANTAGONISTIC
- the fall of auxins in leaf absicion causes production of ethene which encourages absision
- ANTAGONISTIC
- the growing apical bud inhibits growth of lateral shoots
- shaded side of shoot elongates faster than illuminated side as auxins move towards the shadded side
- auxins are broken down by enzymes further down the shoot
- auxins
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