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. 1986 Feb;80(2):424–428. doi: 10.1104/pp.80.2.424

Translucent Tissue Defects in Solanum tuberosum L. 1

II. Alterations in Lipolytic Acyl Hydrolase, Lipoxygenase, and Morphology of Mitochondria and Amyloplasts

Edward C Lulai 1,2,3, Joseph R Sowokinos 1,2,3,2, Jane A Knoper 1,2,3,3
PMCID: PMC1075129  PMID: 16664637

Abstract

We analyzed a physiological defect that involved translucent-like tissue which occurred randomly in potato tubers (Solanum tuberosum L., cv Kennebec) after 8 months of storage. The translucent areas had reduced lipoxygenase (0.73-fold) and lipolytic acyl hydrolase (0.27-fold) activities. The effect(s) of these reduced enzyme activities in vivo is uncertain, but they may have influenced composition, turnover and permeability of membranes because potato lipid is primarily membranous in nature. Electron micrographs of the translucent tissue revealed a discernible decrease in the number of starch granules compared to normal/healthy tissue. A few remaining amyloplasts, which still contained starch granules, possessed large electrondense areas (stroma) within the organelle. Mitochondria in translucent tissue appeared to be present in increased numbers, were aggregated, had fewer but swollen cristae, and, morphologically, were of irregular size and shape suggestive of division. The result of this tuber defect appeared, in part, to be an exaggerated or accelerated form of senescence.

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426Fig. 1
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427Fig. 2
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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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