WOUND REPAIR IN YAM TUBERS: PHYSIOLOGICAL PROCESSES DURING REPAIR

Autor:	J. E. Rickard, S. J. Read, H. C. Passam
Rok vydání:	1976
Předmět:	biology Physiology Starch Invertase activity Abrasion (medical) food and beverages Plant Science medicine.disease biology.organism_classification Respiratory activity chemistry.chemical_compound Horticulture chemistry Dioscorea rotundata Botany Respiration medicine Metabolic activity Sugar
Zdroj:	New Phytologist. 77:325-331
ISSN:	1469-8137 0028-646X
DOI:	10.1111/j.1469-8137.1976.tb01522.x
Popis:	SUMMARY When bisected or deeply cut by knife, yam tubers (Dioscorea rotundata Poir.) undergo a process of wound repair which comprises: (a) an immediate migration of starch to the cut surface (within 5–10 h of injury); (b) after 2–3 days, the formation of a suberized layer beneath the cut surface; (c) after approx. 5 days, the production of periderm (cork). Concurrent with these structural changes are a rapid increase in the rate of respiration, a hydrolysis of starch to sugar and an increase in invertase activity. Metabolic activity remains high until healing is complete. When tubers are wounded by surface abrasion or severe bruising these wound-healing processes do not occur. Weight loss and respiratory activity of bruised tubers remain high until decay. Abrasions or superficial cuts are not sealed off by a layer of periderm, and in consequence a prolonged loss of moisture content and an increased susceptibility to pathogen attack result.
Databáze:	OpenAIRE
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