MECHANISM OF THE ACTION OF LIGHT AND OTHER FACTORS ON STOMATAL MOVEMENT

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Abstract
Stomatal movement and accompanying changes in the guard cells are induced by the same wave lengths of light as are most effective in photosynthesis. This is caused much more through the action of these rays on the green tissue of the leaf than directly on the guard cells. The concentration of CO2 in the leaf may be the intermediate factor. It is confirmed that absence of CO2 favours opening and that a certain concentration causes closure, but also that higher concentrations cause opening. Corresponding changes induced by ammonia and acetic acid are more pronounced when "these agents are applied to leaves in vapour form than when applied to sections, because sectioning has an important effect on guard cells near the wound. This effect is loss of turgor due to increased permeability.

This publication has 1 reference indexed in Scilit:

  • IX. Observations on stomata
    Philosophical Transactions of the Royal Society of London. Series B, Containing Papers of a Biological Character, 1898