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Light which strikes a leaf may be :- Reflected Transmitted – pass straight through Absorbed PowerPoint Presentation
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Light which strikes a leaf may be :- Reflected Transmitted – pass straight through Absorbed - PowerPoint PPT Presentation


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Light striking a leaf. Reflected. Absorbed. Transmitted. Light which strikes a leaf may be :- Reflected Transmitted – pass straight through Absorbed White light is a mixture of wavelengths which show up as different colours when light is passed through a prism.

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Presentation Transcript
slide1

Light striking a leaf

Reflected

Absorbed

Transmitted

  • Light which strikes a leaf may be :-
  • Reflected
  • Transmitted – pass straight through
  • Absorbed
  • White light is a mixture of wavelengths which show up as different colours when light is passed through a prism
slide2

Components of light emerge to form a pattern of colours called a spectrum

Beam of white light. eg. daylight

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Wavelength of light (nm )

When white light is passed through leaf pigments certain colours are absorbed and disappear from the light spectrum. This gives rise to the absorption spectrum -see Handout 1

slide3

Solvent Front

Carotene ( Orange )

Xanthophyll ( Yellow )

Chlorophyll a ( Blue-green )

Chlorophyll b ( Dark green )

Spot Line

Concentrated Chlorophyll Spot

Leaves contain a mixture of pigments :-

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Amount of Photosynthesis

(arbitrary units)

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Wavelength of illumination (nm )

Chlorophyll a and b absorb in the blue and red end

Carotenoids such as xanthophyll and carotene absorb light in other regions e.g. green

Accessory pigments such as the carotenoids absorb some light from other regions of the spectrum and pass the energy on to the chlorophyll.

A range of pigments are desirable as this increases the total quantity of light absorbed by a plant.

Another type of spectrum can be done, where the rate of photosynthesis is measured at different wavelengths. This is called an Action Spectrum

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Comparison of Absorption and Action Spectrum

OHP/Handout

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Relative rate of Photosynthesis

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Relative absorption of light

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Wavelength of light (nm )

  • The absorption spectrum shows that light is absorbed in blue and red ends of the spectrum by chlorophyll
  • The action spectrum shows that light absorbed by chlorophyll is used for photosynthesis
  • The absorption spectrum shows that light is absorbed in green areas of spectrum by carotenoids ( X )
  • The action spectrum shows that the light absorbed by carotenoids in not used directly for photosynthesis
slide7

Leaf pigments are found in the grana of chloroplasts

Lamella – part of inner membrane

Stroma

Granum – contains chlorophyll

Starch Grain

Double Membrane

slide8

Features of a chloroplast

Smooth outer membrane

Highly folded inner membrane which forms layers

Layers contain areas where the membranes are far apart and full of chlorophyll, these are called grana.

The fluid filled interior is called stroma.