Location: Sugarbeet and Potato ResearchTitle: Potato tuber wounding induces responses associated with various healing processes Author
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/24/2015
Publication Date: 4/21/2016
Citation: Lulai, E.C., Neubauer, J., Suttle, J.C., Olson, L.L. 2016. Potato tuber wounding induces responses associated with various healing processes [abstract]. American Journal of Potato Research 93(2):135.
Technical Abstract: Wounding induces an avalanche of biological responses involved in the healing and protection of internal tuber tissues exposed by mechanical damage and seed cutting. Collectively, our studies have framed a portrait of the mechanisms and regulation of potato tuber wound-healing, but much more is required to complete this picture. Earlier we determined the sequential order and protective roles of wound-induced accumulations of suberin biopolymers; this was followed by determination of the involvement of several hormones in regulating wound healing. Currently, we are determining the wound-induced changes in compounds that appear to modulate healing processes. Polyamines (PA) have been implicated in the modulation of a variety of responses to biotic and abiotic plant stresses and have been suggested to be involved in wound healing. However, little is known about PA involvement in tuber wound responses. We determined that wounding induced increases in putrescine and spermidine, but has relatively minor effects on spermine content during a 168 h time course. This time course encompassed the initiation and completion of closing layer formation and initiation of cell division and associated wound periderm formation. The activity of enzymes involved in the first committed step of PA biosynthesis increased within 6 h of wounding and remained elevated throughout this wound-healing time course. Genes involved in PA biosynthesis were also upregulated. Collectively, the results suggest sustained PA involvement in wound healing. Research on the roles of PA mediated modulation of wound healing continues in conjunction with the associated induction of cytokinin biosynthesis and regulation of wound healing.