Pitaya fruits have high senescence rates throughout their postharvest storage period. Additionally, studies confirmed that melatonin plays a regulatory role in plant senescence. However, the involvement of remains unclear. In this study, two cultivars pitaya fruit, ‘Zihonglong’ and ‘Jinghonglong’, were treated with then evaluated for characteristics while 10 days. The results showed treatment d...

Ascorbate peroxidases are haem proteins that efficiently scavenge H2O2 in the cytosol and chloroplasts of plants. Database analyses retrieved 52 expressed sequence tags coding for Arabidopsis thaliana ascorbate peroxidases. Complete sequencing of non-redundant clones revealed three novel types in addition to the two cytosol types described previously in Arabidopsis. Analysis of sequence data av...

background: elicitors can trigger defense responses and activate specific genes involved in secondary metabolite biosynthesis. objective: for understanding sa-treatment signaling pathway we determined defense-related compounds and enzymes in s. marianum hairy root cultures. methods: 28 day old hairy roots were treated by salicylic acid (6 mg/50 ml culture) for different times (24, 48, 72, 96 an...

Ruptured pea (Pisum sativum cv. Massey Gem) chloroplasts exhibited ascorbate peroxidase activity as determined by H(2)O(2)-dependent oxidation of ascorbate and ascorbate-dependent reduction of H(2)O(2). The ratio of ascorbate peroxidase to NADP-glyceraldehyde 3-phosphate dehydrogenase activity was constant during repeated washing of isolated chloroplasts. This indicates that the ascorbate perox...

The combined effect of salicylic acid (SA) (100, 200 and 400 ppm) and water stress (waterlogging and drought) on growth, reactive oxygen species generation and activities of enzymatic and non-enzymatic antioxidants were studied in soybean (Glycine max L. Merr.) leaves.The results proved that the interaction of salicylic acid with water stress significantly increased total protein content and de...

introduction plant responses to environmental stress have a central role in agricultural production. responses results from events occurring at all levels of the organization, from biochemical reactions in cells to whole plant physiology. many plants are injured when exposed to low non-freezing temperatures. however, data on the effects of night temperatures are scarce. on the other hand, nitri...

in this study proline content and activity of catalase (cat), and ascorbate peroxidase (apx) and level of lipid peroxidation in terms of malondialdehyde (mda) content were measured in transgenic tobacco (nicotiana tabacum cv. wisconsin), over expressing a δ-1-pyrroline-5-carboxylate synthase (p5cs) gene, and non transgenic plants as control. drought stress was applied using polyethylene glycol ...

The current study investigated the effects of Pseudomonas putida strain KT2440 on drought tolerance tomato plants during fruit maturation. Plants at ripening stage mature-green were not watered for 20 days to promote stress. Concentrations photosynthetic pigments determined. Bacteria-soaked (BSS) had higher levels chlorophyll and carotenoids than non-soaked (DWS) under stress conditions. Compar...

The transport of pesticides from application areas to other results in pesticide contamination and this sort has led unexpected environmental problems worldwide. It is important determine the responses phytoplanktonic organisms these chemicals for an understanding effects on aquatic ecosystems. In study, Arthrospira platensis Gomont cyanobacteria were exposed different concentrations cypermethr...