Leaf senescence is a typical symptom in plants exposed to dark and may be regulated by plant growth regulators. The objective of this study was to determine whether exogenous application of melatonin (N-acetyl-5-methoxytryptamine) suppresses dark-induced leaf senescence and the effects of melatonin on reactive oxygen species (ROS) scavenging system and chlorophyll degradation pathway in perenni...

Marigold plants (Calendula officinalis Linn) var. ‘Plamen Plus’ were grown under field conditions during the 2009 season in Trebišov, Slovakia and in Sofia, Bulgaria. The antioxidant potential in Slovak marigold flowers was due to the content of glutathione and ascorbate, two peroxidases (glutathione peroxidase and guaiacol peroxidase) and monodehydroascorbate reductase. The antioxidant capacit...

The present study evaluates the genotoxic potential of different soil samples collected from rice fields employing Allium cepa root chromosomal aberration assay using in situ and root dip modes of treatment. The study also involves assessment of oxidative stress by analyzing responses of certain antioxidative enzymes viz. catalase (CAT), ascorbate peroxidase (APX), glutathione reductase (GR), g...

One approach to understanding the Reactive Oxygen Species (ROS)-scavenging systems in plant stress tolerance is to manipulate the levels of antioxidant enzyme activities. In this study, we expressed in the chloroplast three such enzymes: dehydroascorbate reductase (DHAR), glutathione-S-transferase (GST) and glutathione reductase (GR). Homoplasmic chloroplast transformants containing either DHAR...

The effect of four soil-applied sulfur (100 mg S kg?1 soil (100S) and 200 (200S)) in different sources (elemental S, ammonium sulfate, gypsum or magnesium sulfate) protecting mustard (Brassica juncea L. (Czern & Coss.)) from cadmium effects was studied. Based on the observed reduction growth photosynthesis plants subjected to 100 Cd soil, B. cv. Giriraj selected as most Cd-tolerant among fi...

5-Aminolevulinic acid (ALA) is the precursor of tetrapyrrole synthesis, and hydrogen sulfide (H2S) a gas signal molecule. Studies have shown that exogenous ALA H2S can alleviate abiotic stress. This study evaluated roles their interactions in regulating antioxidant activity pepper seedlings under chilling Chilling stress significantly inhibited growth increased amounts peroxide (H2O2), superoxi...