Showing papers by "Kavita Shah published in 2015"
TL;DR: In this paper, the role of salicylic acid in rice plants grown under Cd-contaminated soil was studied and the integration of different signals, SA-induced Cd2+ tolerance and SA-elevated enzymatic and non-enzymatic antioxidant pool in rice was observed.
Abstract: Role of salicylic acid in plants grown under metal contaminated soil is not yet understood. To investigate if signaling by Cd-induced H2O2 or SA, collide or integrate, rice cv. HUR3022, grown for 3, 7 and 10 day under 50 µM Cd/SA alone or in combination were studied. Dynamic distribution of Cd2+ and SA, cell viability, time-dependent changes in H2O2 levels, free proline, chlorophyll, ascorbate and glutathione pools and altered antioxidant enzymes in roots/shoots of rice were observed. Exogenous SA decelerated cell-death in Cd-stressed rice playing a positive role in protection against injury. Cd led to elevated activities of superoxide dismutase, ascorbate peroxidase, guaiacol peroxidase and phenylalanine ammonia lyase and lowered catalase and glutathione reductase activities in roots and shoots of rice seedlings. By contrast, SA + Cd2+ reversed the trend of enzyme activities, levels of non-enzymatic antioxidants and GSH in roots/shoots suggesting alleviation of Cd-induced oxidative damage in rice. Suppression of Cd-uptake in presence of SA suggest an epistatic effect of SA-signal over Cd-induced ROS-signal in rice roots. No additive effects of SA or H2O2 signals were noted in Cd-stressed rice. Results indicate integration of different signals and SA-enhanced Cd2+ tolerance due to SA-regulated Cd2+ uptake as well as the SA-elevated enzymatic and non-enzymatic antioxidant pool in rice. Role of salicylic acid in rice plants grown under Cd-contaminated soil was studied. Cd-induced H2O2 or SA, signals both collide and/or integrate. Dynamic distribution of Cd2+ and SA, cell viability, time-dependent changes in H2O2 levels, free proline, chlorophyll, ascorbate and glutathione pools appear. Suppression of Cd-uptake in presence of SA were noted. Integration of different signals, SA-induced Cd2+ tolerance and SA-elevated enzymatic and non-enzymatic antioxidant pool in rice was observed.
28 citations
TL;DR: Results suggest that although differences between tomatoes from transgenics and non-transgenics do exist, yet tomato fruits from transgenic plants have relatively improved antioxidant capacity than those from non- Transgenic plants and therefore may be products safe for consumption.
Abstract: Advances in agricultural biotechnology bring forth the need for experimental evidence for benefits and risks of engineered crops and the quality of fruit products obtained from them. Tomato fruits from non-transgenic (NT) and BcZAT12-transformed tomato lines ZT1-ZT6 (cv. H-86, var. Kashi vishesh) tolerant to drought, were assessed for nutritional quality, changes in physico-chemical characteristics and health-related bioactive compounds. Fruits from transgenics were evaluated for size, pH, total-soluble solids, total sugars, phenolics, flavonoids, vitamin C, lycopene and β-carotene. An early ripening of tomatoes from transgenics with more red but smaller fruits, high sugar levels, elevated phenolics, flavonoids, lycopene and β-carotene with an unaltered vitamin C levels as compared to tomatoes from non-transgenics were noted. Results suggest that although differences between tomatoes from transgenics and non-transgenics do exist, yet tomato fruits from transgenic plants have relatively improved antioxidant capacity than those from non-transgenics and therefore may be products safe for consumption.
16 citations
TL;DR: The foliar application of TCZ decreases the area under disease progress curve, lesion development and spore formation on barley leaves thereby reducing potential for the disease development and works against to pathogen for better management of spot blotch disease in barley infected with B. sorokiniana.
Abstract: Bipolaris sorokiniana synthesizes the 1,8-dihydroxynaphthalene (DHN) melanin via pentaketide pathway and promotes the development of aerial mycelia and conidia. A melanin biosynthesis inhibitor Tricyclazole (TCZ), brought changes when applied at 5–100 μg ml−1 concentration in the colony morphology, radial growth, mycelia weight, melanin content, antioxidant enzymes (SOD and CAT) and extracellular hydrolytic enzymes (cellulase, pectinase, amylase and protease) in black, mixed and white isolates of B. sorokiniana. A significant alteration was recorded in antioxidant enzymes in black and mixed isolates; however, non-significant alteration was recorded in white isolate. Isolates of B. sorokiniana exposed to 100 µg ml−1 TCZ showed significantly increased formation of superoxide radical (O
2
−
) and hydrogen peroxide (H2O2)·H2O2 was detected significantly high in hyphae and conidia while, O
2
−
was found primarily in the conidia. Microscopic results suggest that TCZ damages not only the cell wall but also the cell membrane. The foliar application of TCZ (25, 50 and 100 µg ml−1) decreases the area under disease progress curve, lesion development and spore formation on barley leaves thereby reducing potential for the disease development. In conclusion TCZ influences the pathogenic ability by damaging the cell structure of hyphae and conidia and also alters the antioxidant enzyme levels in B. sorokiniana. TCZ may therefore, works against to pathogen for better management of spot blotch disease in barley infected with B. sorokiniana.
16 citations