TITLE

Irradiance and phenotype: comparative eco-development of sun and shade leaves in relation to photosynthetic CO2 diffusion

AUTHOR(S)
Terashima, Ichiro; Hanba, Yuko T.; Tazoe, Youshi; Vyas, Poonam; Yano, Satoshi
PUB. DATE
January 2006
SOURCE
Journal of Experimental Botany;Jan2006, Vol. 57 Issue 2, p343
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The subject of this paper, sun leaves are thicker and show higher photosynthetic rates than the shade leaves, is approached in two ways. The first seeks to answer the question: why are sun leaves thicker than shade leaves? To do this, CO2 diffusion within a leaf is examined first. Because affinity of Rubisco for CO2 is low, the carboxylation of ribulose 1,5-bisphosphate is competitively inhibited by O2, and the oxygenation of ribulose 1,5-bisphosphate leads to energy-consuming photorespiration, it is essential for C3 plants to maintain the CO2 concentration in the chloroplast as high as possible. Since the internal conductance for CO2 diffusion from the intercellular space to the chloroplast stroma is finite and relatively small, C3 leaves should have sufficient mesophyll surfaces occupied by chloroplasts to secure the area for CO2 dissolution and transport. This explains why sun leaves are thicker. The second approach is mechanistic or ‘how-oriented’. Mechanisms are discussed as to how sun leaves become thicker than shade leaves, in particular, the long-distance signal transduction from mature leaves to leaf primordia inducing the periclinal division of the palisade tissue cells. To increase the mesophyll surface area, the leaf can either be thicker or have smaller cells. Issues of cell size are discussed to understand plasticity in leaf thickness.
ACCESSION #
44577517

 

Related Articles

  • photosynthesis:. Gough, Robert E. // Glossary of Vital Terms for the Home Gardener;1993, p70 

    A definition of the term "photosynthesis" is presented. It refers to the process by which sugars are made from water and carbon dioxide in the chloroplasts in the presence of light.

  • A welcome diversion from photorespiration. Leegood, Richard C. // Nature Biotechnology;May2007, Vol. 25 Issue 5, p539 

    The article features the study by R. Kabeish related to conventional photorespiration. In this study, Kabeish shows that photorespiratory losses in Arabidopsis thaliana can be alleviated by introducing into chloroplasts a bacterial pathway for the catabolism of the photorespiratory substrate,...

  • De novo post-illumination monoterpene burst in Quercus ilex (holm oak). Srikanta Dani, K.; Marino, Giovanni; Taiti, Cosimo; Mancuso, Stefano; Atwell, Brian; Loreto, Francesco; Centritto, Mauro // Planta;Feb2017, Vol. 245 Issue 2, p459 

    Main conclusion : Explicit proof for de novo origin of a rare post-illumination monoterpene burst and its consistency under low O , shows interaction of photorespiration, photosynthesis, and isoprenoid biosynthesis during light-dark transitions. Quercus ilex L (holm oak) constitutively emits...

  • Evolution: A smooth path to C4 photosynthesis. Burgess, Darren J. // Nature Reviews Genetics;Aug2013, Vol. 14 Issue 8, p518 

    The article presents a study by researchers on theoretical modelling to characterize the fitness consequences of the various possible evolutionary paths to C4 photosynthesis.

  • Photosynthesis, photorespiration, and light signalling in defence responses. Kangasjärvi, Saijaliisa; Neukermans, Jenny; Li, Shengchun; Aro, Eva-Mari; Noctor, Graham // Journal of Experimental Botany;Apr2012, Vol. 63 Issue 4, p1619 

    Visible light is the basic energetic driver of plant biomass production through photosynthesis. The constantly fluctuating availability of light and other environmental factors means that the photosynthetic apparatus must be able to operate in a dynamic fashion appropriate to the prevailing...

  • Reappraisal of the Role of Sodium in the Light-Dependent Active Transport of Pyruvate into Mesophyll Chloroplasts of C4 Plants. Aoki, Naohiro; Kanai, Ryuzi // Plant & Cell Physiology;Nov1997, Vol. 38 Issue 11, p1217 

    The mechanism of light-dependent active transport of pyruvate in C4 mesophyll chloroplasts has not been clarified, particularly in Na+-type C4 species, in which the pyruvate uptake into mesophyll chloroplasts is enhanced by illumination or by making a Na+ gradient (Na+-jump) across the envelope...

  • Discovery of new gene could improve efficiency of molecular factories.  // Biomedical Market Newsletter;11/9/2011, Vol. 21, p524 

    The article reports that a group of researchers, led by Michigan State University plant biologist Katherine Osteryoung, has discovered a new class of proteins called Clumped Chloroplasts. Clumped Chloroplasts are noted to have a primary role in helping chloroplasts, which carry out the...

  • Underwater Photosynthesis in Flooded Terrestrial Plants: A Matter of Leaf Plasticity. MOMMER, LIESJE; VISSER, ERIC J. W. // Annals of Botany;Sep2005, Vol. 96 Issue 4, p581 

    � Background Flooding causes substantial stress for terrestrial plants, particularly if the floodwater completely submerges the shoot. The main problems during submergence are shortage of oxygen due to the slow diffusion rates of gases in water, and depletion of carbohydrates, which is the...

  • Photosynthesis research on yellowtops: Macroevolution in progress. Kutschera, U.; Niklas, K.J. // Theory in Biosciences;Apr2007, Vol. 125 Issue 2, p81 

    Abstract: The vast majority of angiosperms, including most of the agronomically important crop plants (wheat, etc.), assimilate CO2 through the inefficient C3 pathway of photosynthesis. Under ambient conditions these organisms loose about 1/3 of fixed carbon via photorespiration, an...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics