Leaf architecture and direction of incident light influence mesophyll fluorescence profiles.

@article{Johnson2005LeafAA,
  title={Leaf architecture and direction of incident light influence mesophyll fluorescence profiles.},
  author={Daniel M. Johnson and William K. Smith and Thomas C. Vogelmann and Craig R. Brodersen},
  journal={American journal of botany},
  year={2005},
  volume={92 9},
  pages={
          1425-31
        }
}
Light propagation and distribution inside leaves have been recognized as important processes influencing photosynthesis. Monochromatic light absorption across the mesophyll was measured using chlorophyll fluorescence generated from illumination of the cut edge (epi-illumination), as well as the adaxial or abaxial surfaces of the leaf. Species were selected that had basic leaf types: laminar leaf with adaxial palisade layer (Rhododendron catawbiense), needle with palisade (Abies fraseri), and… 

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References

SHOWING 1-10 OF 25 REFERENCES

Light Gradients and the Transverse Distribution of Chlorophyll Fluorescence in Mangrove and Camellia Leaves

TLDR
In the mangrove leaves, scattered light declined significantly in the non-assimilatory cell layer which is in front of the assimilatory cells, which appear to be well organized to capture weak light.

Light and chlorophyll gradients within Cucurbita cotyledons

TLDR
Comparisons of scattered light gradients obtained from cotyledons irradiated on upper and lower surfaces suggested that spongy mesophyll cells scatter light more effectively than palisade cells, probably due to the greater proportion of intercellular air spaces in spongo-mesophyll tissue.

Measurement of gradients of absorbed light in spinach leaves from chlorophyll fluorescence profiles

Profiles of chlorophyll fluorescence were measured in spinach leaves irradiated with monochromatic light. The characteristics of the profiles within the mesophyll were determined by the optical

The functional significance of palisade tissue : penetration of directional versus diffuse light

TLDR
Light gradients were measured in leaves that had different types of anatomical development of the mesophyll but similar pigment content, suggesting that palisade tissue may help distribute light more uniformly to chloroplasts within the leaf.

Profiles of light absorption and chlorophyll within spinach leaves from chlorophyll fluorescence

Chlorophyll fluorescence was used to estimate profiles of absorbed light within chlorophyll solutions and leaves. For chlorophyll solutions, the intensity of the emitted fluorescence declined in a

Photosynthetic Light Gradients and Spectral Regime within Leaves of Medicago sativa

TLDR
In M. sativa leaves, the light microenvironment, leaf anatomy and photosynthesis seem to be strongly interrelated and the spectral regime of the light fluxes depended upon their direction of travel within the leaf.

Profiles of 14C fixation through spinach leaves in relation to light absorption and photosynthetic capacity

TLDR
Using a combination of several techniques, a comprehensive description of spinach leaves has been obtained and there was remarkably good agreement between the observed and modelled CO2 fixation profiles for the eight combinations of colour, orientation and irradiance tested.

Leaf anatomy enables more equal access to light and CO2 between chloroplasts

TLDR
The influence of leaf anatomy on both light capture and CO2 diffusion is examined and a simple model couples light absorption through the leaf with the profile of chlorophyll through a leaf and the gradient in photosynthetic capacity is couples with 14CO2 fixation profiles obtained through spinach leaves obtained in various studies.

A system for imaging transverse distribution of scattered light and chlorophyll fluorescence in intact rice leaves

In order to examine the transverse distribution of scattered light and chlorophyll fluorescence in intact rice leaves, a micro-fluorescence imaging system was devised using a microscope, a CCD camera