Summary
A variety of histological conditions characterize the internal blackspot that results from bruising of potatoes. Phenolics, principally chlorogenic acid, accumulate in the injured area. Melanin forms on intracellular surfaces of the protoplasts and also inner cell wall surfaces. Cell wall suberization is sporadic in small blackspot sites, but more general in larger ones. Some lignification, increases in hemicelluloses, and change in pectins also may occur. Changes in distribution of intracellular lipids also was observed. Initiation of wound phellogen was observed only in situations where the original periderm had been broken and where crushing of internal cells had occurred. Cell wall suberization, increases in hemicelluloses, and increase in chlorogenic acid are common to both blackspot and physiological necrosis.
Resumen
Una variedad de condiciones histológicas caracteriza la mancha negra interna que resulta de contusiones sufridas por las papas, Fenoles, principalmente el ácido clorogénico, se acumulan en la parte dañada. Melanina se forma en las superfícies intracelulares de los protoplastos y también en las superfícies de las paredes celulares internas. La suberización de la pared celular ocurre esporadicamente en las manchas negras pequenas, pero es más general en las grandes. Lignificación parcial, incrementos en hemicelulosas, y cambios en pectinas también pueden ocurrir. Además se han observado cambios en la distributión de lipidos intracelulares. La iniciaciń del felógeno en las heridas fué observada solamente en situaciones donde el peridermo original habia sido dañado y donde las células internas habían sido dañadas. La suberización de la pared celular, incremento en hemicelulosas e incremento en ácido clorogénico son comunes tanto a la mancha negra como a la necrosis fisiológica.
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Reeve, R.M. Preliminary histological observation on internal blackspot in potatoes. American Potato Journal 45, 157–167 (1968). https://doi.org/10.1007/BF02849143
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DOI: https://doi.org/10.1007/BF02849143