Rapid Metabolic Changes in the Wounding Response of Leaf Discs following Excision.
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TLDR
The results indicate that extrapolation from leaf discs to intact leaves is highly inadvisable.Abstract:
The dark respiration rate of discs from fully expanded tobacco leaves (Nicotiana tabacum) increased linearly with decreasing diameter, the relative increase being independent of leaf age The wound respiration responsible for this situation reached a plateau within 15 minutes of excision Metabolite analysis gave evidence for two independent effects, also unrelated to age The first was a forward crossover between phosphoenolpyruvate and pyruvate which was found as early as 1 minute after excision and persisted for up to 40 minutes It was attributed to activation of pyruvate kinase by a changed ionic balance resulting from membrane damage, was accompanied by a reverse crossover between triose phosphates and 3-phosphoglycerate, and was localized in the outer region of the discs The second effect was a rapid rise in hexose monophosphate and ATP levels throughout the discs After 1 to 10 minutes the ATP/ADP ratio rose strongly for at least 3 hours; after 20 to 40 minutes there was net synthesis of adenine nucleotide as ATP These results indicate that extrapolation from leaf discs to intact leaves is highly inadvisableread more
Citations
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References
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Journal ArticleDOI
Wound-Induced Proteinase Inhibitor in Plant Leaves: A Possible Defense Mechanism against Insects.
T. R. Green,Clarence A. Ryan +1 more
TL;DR: The transport of a factor out of damaged leaves takes place rapidly after the wound is inflicted and the levels of proteinase inhibitor, in both damaged and adjacent leaves, rises strikingly within a few hours.
Journal ArticleDOI
Action potentials in higher plants
TL;DR: This paper aims to provide a systematic literature review of the efforts to characterize and quantify the action potentials of various presently known mechanisms of action-field reprograming.
Journal ArticleDOI
Localization of interaction sites in multi-component transfer systems: theorems derived from analogues.
TL;DR: Localization of Interaction Sites in Multi-Component Transfer Systems: Theorems Derived from Analogues
Journal ArticleDOI
Photosynthesis and CO2 evolution by leaf discs: gas exchange, extraction, and ion-exchange fractionation of 14C-labeled photosynthetic products
Craig A. Atkins,David T. Canvin +1 more
TL;DR: Analysis of the products of 14CO2 fixation from whole leaves and leaf discs and a comparison of the gas exchange under various conditions established that the leaf discs accurately reflected the metabolism of the attached leaves.
Journal ArticleDOI
Genetic and metabolic regulation in differentiating plant storage tissue cells
TL;DR: Plant storage tissue slices provide an excellent example of genetic and metabolic regulation occurring side by side and easy-to-handle material for the study of the elementary processes at the gene level following derepression of previously repressed genes in multicellular organisms.
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