Abstract
The structure and osmotic potentials of parenchyma cells associated with internal phloem of growing, dormant, and sprouting potato tubers (Solanum tuberosum L. cv. Irish Cobbler) were studied. Companion cells, specialized parenchyma cells, and storage parenchyma cells were recognizable by differences in structural characteristics. Companion cells were usually densely cytoplasmic with numerous large mitochondria and plastids with little or no starch. The specialized parenchyma cells which surrounded groups of sieve tubes and companion cells had numerous vacuoles of various size, small mitochondria, plastids with very little or no starch, and protein inclusions. Storage parenchyma cells had amyloplasts with very large starch grains, a large central vacuole with osmiophilic inclusions, and few organelles in a peripheral cytoplasm. The osmotic potentials of specialized parenchyma cells and storage parenchyma cells were similar and did not vary regardless of whether the tubers were growing, dormant, or sprouting.
Resumen
En este estudio se analizó la estructura y potencial osmótico de células del parénquima asociadas con el floema interno de tubérculos de papa (Solarium tuberosum L. cv. Irish Cobbler) en estado de crecimiento, dormancia y brotación. Las células compañeras, células especializadas del parénquima y celulas de almacenamiento del parénquima fueron identificadas de acuerdo a sus características estructurales. Las células compañeras se mostraron normalmente con un citoplasma denso, mitocondrias numerosas, grandes y plastidios con poco o sin almidón. Las células especializadas del parénquima, que rodeaban a grupos de vasos cribosos y a celulas compañeras, tenían numerosas vacuolas de diferente tamaño, mitocondrias pequeñas, plastidios con poco o sin almidón e inclusiones de proteínas. Las células del parénquima tenían amiloplastos con granos de almidoń de gran tamaño, una vacuola central grande, con inclusiones osmiofílicas y pocas organelas en su citoplasma periférico. Los potenciales osmóticos de las células especializadas del parénquima y de las células de almacenamiento fueron similares, sin mostrar variación aún cuando se comparó tubérculos en crecimiento, dormancia o en estado de brotación.
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Peterson, C.A., Peterson, R.L. & Barker, W.G. Observations on the structure and osmotic potentials of parenchyma associated with the internal phloem of potato tubers. American Potato Journal 58, 575–584 (1981). https://doi.org/10.1007/BF02853467
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DOI: https://doi.org/10.1007/BF02853467