By Herbert M. Hull (auth.), Francis A. Gunther (eds.)

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The study of ectodesmata, including their structure, function, and even their detection, continues to be an area of zealous research. Ectodesmata are fine plasmodesmata-like structures, Leaf structure and absorption 35 but of an apparently non-plasmatic nature, and are found in the outer periclinal epidermal cell walls, primarily in leaves. They also occur in the walls of guard cells, the basal cells of trichomes, glandular hairs, and in epidermal cells surrounding these structures, including the anticlinal walls.

In species with sparse surface wax deposits it was possible to identify pores and canals under a single deposit. No pores could be detected on the inner surface of apple or clover cuticle after its isolation with pectinase, apparently because of its great roughness. The presence of pores in the cuticles of various specialized glands has also been demonstrated by electron microscopy. 5 hours after surface feeding with albumin. He found that although the cuticle was partially disintegrated or dissolved in some portions, pores were visible in other parts which led partially or entirely through the cuticle to the epidermal cell wall.

The demonstration of ectodesmata with the microscope is also dependent upon the wavelength and intensity of the light used. , SIEVERS (1960) found in Primula veris, P. ) were only weakly effective. Another factor, discussed in some detail by SumoRuKov and PLOTNIKOVA (1965), is the apparent disappearance of ectodesmata following the action of certain toxicants or pathogens. If the unfavorable stimulus is mild and subsequently removed, the ectodesmata again become demonstrable. However, with a more severe action, permanent degradation of the structures occurs and is accompanied by derangement and ultimate death of the protoplasts.

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