Humberto Antonio López-Delgado

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Increased oxidative stress displayed during dark-senescence of wheat leaves (Triticum aestivum L.) is caused not only by the increased levels of radicals but also by a loss of antioxidant capacity. Mature leaves were incubated in 6-benzylaminopurine (BAP 10(-4)M) or water (control) during 6d in the dark. The senescence-delaying effect of BAP was associated(More)
This research evaluated the effects of arbuscular mycorrhizal fungi (AMF) on growth, nutritional status, total antioxidant activity (AOX), total soluble phenolics content (TPC), and total nitrate reductase activity (NRA) of leaves and roots of Melilotus albus Medik planted in diesel-contaminated sand (7500 mg kg(-1)). Seedlings of Melilotus either Non(More)
H2O2-mediated symptoms and antioxidant responses were examined in phytoplasma-infected potato plants under drought conditions. In vitro phytoplasma-infected or uninfected plants were transferred to a greenhouse and sprayed twice a week with H2O2. Phytoplasma decreased water potential, catalase (CAT) activity and increased H2O2 content significantly. H2O2(More)
Salicylic acid (SA) and hydrogen peroxide (H2O2) are involved in similar signaling responses to stress. Previous reports demonstrated micro-tuberization induction by salicylates. Both SA and H2O2 induce similar long term signaling responses to stress. In the present work, the potential long term effect of H2O2 on the induction of micro-tuberization was(More)
Short and long term effects of hydrogen peroxide (H2O2) and salicylic acid (SA) were examined in: thermotolerance, virus X (PVX)-free microplants obtained by in vitro thermotherapy, catalase activity (CAT) and H2O2 concentration. Short term effects (STE) were tested as follows: (a) nodal explants were cultivated 30 d on MS medium containing SA 10−5 or 10−6(More)
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