chlorophyll-a and Wounds-and-Injuries

Variable indirect photosynthetic rate (P(n)) responses occur on injured leaves after insect herbivory. It is important to understand factors that influence indirect P(n) reductions after injury. The current study examines the relationship between gas exchange and chlorophyll a fluorescence parameters with injury intensity (% single leaf tissue removal) from clipping or Spodoptera eridania Stoll (Noctuidae) herbivory on Nerium oleander L. (Apocynaceae). Two experiments showed intercellular [CO(2)] increases but P(n) and stomatal conductance reductions with increasing injury intensity, suggesting non-stomatal P(n) limitation. Also, P(n) recovery was incomplete at 3d post-injury. This is the first report of a negative exponential P(n) impairment function with leaf injury intensity to suggest high N. oleander leaf sensitivity to indirect P(n) impairment. Negative linear functions occurred between most other gas exchange and chlorophyll a fluorescence parameters with injury intensity. The degree of light harvesting impairment increased with injury intensity via lower (1) photochemical efficiency indicated lower energy transfer efficiency from reaction centers to PSII, (2) photochemical quenching indicated reaction center closure, and (3) electron transport rates indicated less energy traveling through PSII. Future studies can examine additional mechanisms (mesophyll conductance, carbon fixation, and cardenolide induction) to cause N. oleander indirect leaf P(n) reductions after injury.

Topics: Animals; Carbon Dioxide; Chlorophyll; Chlorophyll A; Electron Transport; Fluorescence; Herbivory; Light; Light-Harvesting Protein Complexes; Nerium; Photosynthesis; Photosystem II Protein Complex; Plant Leaves; Plant Stomata; Plant Transpiration; Spodoptera; Wounds and Injuries

Topics: Burns; Chlorophyll; Chlorophyllides; Diabetes Mellitus; Eczema; Humans; Leg Ulcer; Radiation Injuries; Skin Ulcer; Ulcer; Varicose Ulcer; Wounds and Injuries

Topics: Chlorophyll; Humans; Ointments; Papain; Peptide Hydrolases; Ulcer; Urea; Wounds and Injuries

Topics: Chlorophyll; Debridement; Endopeptidases; Humans; Ointments; Papain; Peptide Hydrolases; Urea; Wound Infection; Wounds and Injuries

Topics: Chlorophyll; Hydrolases; Papain; Peptide Hydrolases; Urea; Water; Wound Infection; Wounds and Injuries

Topics: Ammonium Compounds; Animals; Anti-Infective Agents, Local; Chlorophyll; Lagomorpha; Quaternary Ammonium Compounds; Rabbits; Wound Healing; Wounds and Injuries

Topics: Chlorophyll; Deoxyribonuclease I; Psychotherapy; Streptodornase and Streptokinase; Streptokinase; Wounds and Injuries

Topics: Chlorophyll; Chlorophyllides; Humans; Peptide Hydrolases; Psychotherapy; Urea; Wounds and Injuries

Topics: Chlorophyll; Exudates and Transudates; Hemagglutination; Hemagglutination Tests; Humans; Wounds and Injuries

Topics: Chlorophyll; Glutathione; Surgical Procedures, Operative; Wounds and Injuries

Topics: Chlorophyll; Glutathione; Psychotherapy; Wounds and Injuries

Topics: Chlorophyll; Chlorophyllides; Glutathione; Oxidation-Reduction; Psychotherapy; Wounds and Injuries

Topics: Chlorophyll; Glutathione; Humans; Psychotherapy; Wounds and Injuries

Topics: Animals; Chlorophyll; Cornea; Corneal Injuries; Oxides; Rabbits; Tantalum; Wounds and Injuries

Topics: Chlorophyll; Chlorophyll A; Psychotherapy; Wounds and Injuries

Topics: Chlorophyll; Glutathione; Oxidation-Reduction; Psychotherapy; Wounds and Injuries

Topics: Chlorophyll; Eczema; Psychotherapy; Wounds and Injuries

Topics: Chlorophyll; Psychotherapy; Skin Diseases; Wounds and Injuries

Topics: Burns; Chlorophyll; Humans; Leg Ulcer; Psychotherapy; Skin Ulcer; Ulcer; Wounds and Injuries

Topics: Chlorophyll; Escherichia coli; Escherichia coli Infections; Humans; Psychotherapy; Wounds and Injuries

Topics: Burns; Chlorophyll; Humans; Water; Wounds and Injuries

Topics: Chlorophyll; Deodorants; Humans; Psychotherapy; Wound Healing; Wounds and Injuries

Topics: Chlorophyll; Dental Caries; Deodorants; Humans; Wounds and Injuries

Topics: Chlorophyll; Wounds and Injuries

Topics: Biomedical Research; Chlorophyll; Humans; Wound Healing; Wounds and Injuries

Topics: Chlorophyll; Humans; Wound Healing; Wounds and Injuries