A2 module 4: Plant co-ordination

Revision notes I put together detailing plant co-ordination and hormones.

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Specification

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Light response mechanisms
Light is vital for photosynthesis
But also necessary to direct plant growth and
development
Light acts as a signal to initiate and regulate
photoperiodism and photomorphogenesis
There are two light-sensing systems
involved in these responses;
the blue light sensitive system

Slide 4

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Blue light response
Many plant responses are regulated by blue
light;
Phototropism
stomatal opening
chlorophyll synthesis
The last step of chlorophyll synthesis
requires high levels of blue light
The other blue light responses are triggered

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Red light response
Phytochrome responses:
Important plant responses regulated
by the phytochrome system include;
photoperiodic induction of flowering
chloroplast development
leaf senescence
leaf abscission

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The need for control
Phytochromes are found in the leaves of
flowering plants and allow determination of
day/night
It is energetically expensive and dangerous for a
plant to flower during the wrong time (night) or
season (winter if it is a summer plant)
Therefore, a system is required to manage
flowering

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