THE EFFECT OF PRE‐EMERGENT TREATMENT OF PEAS WITH TRICHLORACETIC ACID ON THE SUB‐MICROSCOPIC STRUCTURE OF THE LEAF SURFACE
ABSTRACT Peas were sown in sand, which was treated with varying concentrations of trichloracetic acid. The behaviour of water droplets on the leaves of peas was observed, and it was found that the angle made by the droplet on the surface falls with increasing concentration of T.C.A. No changes in leaf structure, which could account for these changes in behaviour, were revealed by ordinary light microscopy. Investigation of the sub-microscopic anatomy of the surface by the carbon replica technique under the electron microscope did reveal significant differences in the leaf surfaces. A reduction in the number and a change in form of the minute wax structures occurs with an increased concentration of T.C.A. in the soil. These changes correlate well with an increase in the wettability of the leaf surface as determined by the contact angle of water droplets.
- Proceedings of the Royal Society of Medicine 09/1947; 134(877):503-22.
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ABSTRACT: Naturally-occurring auxins, of which indoleacetic acid is the best known example, have a striking apex-to-base polar transport. This may have led to the belief that all plant regulators have a rather specific mode of absorption and of transport. However, since plant regulators now (5) include a wide variety of organic compounds this seems most unlikely. Many of the phenomena which are involved in the absorption and translocation of regulators in plants are well known. However, a unified picture seems lacking. It is a rather new field, which one will not find discussed in standard texts of plant physiology. The significance of this subject is more than academic. In recent years sprays have been applied to plants for a multitude of practical purposes (106a). New techniques have helped in the understanding of the principles of absorption and translocation. Enzymatic digestion is used for the isolation of the plant cuticle, a principal barrier through which materials must pass. Electron microscopy is showing ...11/2003; 7:355-372.
Article: Electron Microscopy of Leaf SurfacesNature 01/1957; 180(4581):330-331. · 38.60 Impact Factor