Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 4/1/2005
Publication Date: 7/1/2005
Citation: Lulai, E.C., Suttle, J.C. 2005. Potato tuber absisic acid: concentration dynamics and invovlement in wound response. 16th Triennial Conference of the European Association for Potato Research. Poster 81. p.775-777.
Technical Abstract: The suberized cells within the native periderm and wound periderm of the potato tuber provide a very broad and durable form of protection against disease, dehydration and a variety of intrusions. However, very little is known about the signals and mechanisms that regulate wound-induced suberization. The objectives of this research were to determine the dynamics of tuber ABA concentrations during potato storage and the involvement of ABA in tuber wound-healing. Results showed that tuber ABA content varied during storage. ABA concentrations increase after harvest through the third month, and in some sample lots to the sixth month, of storage. By the ninth month of storage, ABA content decreased significantly throughout the tuber to approximately the concentration found at harvest. These basal ABA concentrations may be of importance in regulating a variety of physiological processes including wound-healing. Wounding introduced another dynamic in tuber ABA concentrations. Tuber ABA concentrations in tissues neighboring the wound did not change dramatically for several hours after wounding. By twelve hours after wounding ABA concentrations had noticeably increased, by 24 to 48 hours after wounding ABA concentrations reached a maximum, and by 96 hr the concentrations began to decrease. These and other results are providing indications of how ABA may be involved in tuber wound-healing.