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Photosynthetic capacity

define capacity, define capacity building
Photosynthetic capacity Amax is a measure of the maximum rate at which leaves are able to fix carbon during photosynthesis It is typically measured as the amount of carbon dioxide that is fixed per metre squared per second, for example as μmol m−2 sec−1

Limitations

Photosynthetic capacity is limited by carboxylation capacity and electron transport capacity For example, in high carbon dioxide concentrations or in low light, the plant is not able to regenerate ribulose-1,5-bisphosphate fast enough also known RUBP, the acceptor molecule in photosynthetic carbon reduction So in this case, photosynthetic capacity is limited by electron transport of the light reaction, which generates the NADPH and ATP required for the PCR Calvin Cycle, and regeneration of RUBP On the other hand, in low carbon dioxide concentrations, the capacity of the plant to perform carboxylation adding carbon dioxide to Rubisco is limited by the amount of available carbon dioxide, with plenty of Rubsico left over¹ Light response, or photosynthesis-irradiance, curves display these relationships

Current Research

Recent studies have shown that photosynthetic capacity in leaves can be increased with an increase in the number of stomata per leaf This could be important in further crop development engineering to increase the photosynthetic efficiency through increasing diffusion of carbon dioxide into the plant²

References

1 Hopkins, WIlliam G and N P A Hüner 2009 Introduction to Plant Physiology, 4th ed John Wiley & Sons, Inc

2 Tanaka, Y, S S Sugano, T Shimada, and I Hara-Nishimura 2013 Enhancement of leaf photosynthetic capacity through increased stomatal density in Arabidopsis New Phytologist 198: 757-764


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Photosynthetic capacity


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    Photosynthetic capacity beatiful post thanks!

    29.10.2014


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