Rup Kumar Kar

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Responses of plants to water stress may be assigned as either injurious change or tolerance index. One of the primary and cardinal changes in response to drought stress is the generation of reactive oxygen species (ROS), which is being considered as the cause of cellular damage. However, recently a signaling role of such ROS in triggering the ROS scavenging(More)
Three species of fast growing fuel wood yielding plants locally available (Acacia holosericea, Bauhinia variegata and Cassia siamea) were characterized in respect of their responses to water stress. Seedlings (25 days) of these species, exposed to two levels of water stress (−0.5 and −1.0 MPa) induced by PEG-6000 for 24 h, were analysed for relative water(More)
Involvement of reactive oxygen species in regulation of plant growth and development is recently being demonstrated with various results depending on the experimental system and plant species. Role of superoxide and its metabolism in germination and axis growth was investigated in case of Vigna radiata seeds, a non-endospermous leguminous species having(More)
Axis growth during seed germination is mediated by reactive oxygen species and apoplastic peroxidase plays a role by producing OH · from H 2 O 2 . Ca 2+ activates both apoplastic peroxidase and NADPH oxidase. Role of reactive oxygen species (ROS) in seed germination and axis growth has been demonstrated in our earlier works with Vigna radiata seeds by(More)
Five cold temperature germinating (ctg) mutants, completing germination at 10 degrees C faster than wild type, have been recovered from activation-tagged populations of Arabidopsis thaliana. Three (ctg10-D, 41-D, and 144-D) were tagged and segregated 3:1 for BASTA resistance in the F2 when crossed with wild type. None of the tagged ctg mutants was disturbed(More)
Light treatment markedly accelerated chlorophyll loss in Hydrilla (Hydrilla verticillata [L.f.] Royle) over dark treatment whereas such acceleration could not be observed in spinach (Spinacia oleracea L.) leaf segments. Spermine, a polyamine, retarded the loss of chlorophyll in the dark but markedly accelerated this loss in the light during senescence of(More)
A total of ten rare indigenous rice landraces of West Bengal were screened for germination potential and seedling growth under varying concentrations of sodium chloride (NaCl) and polyethylene glycol (PEG) solutions as osmotic stress inducing agents. Among the studied rice landraces Kelas and Bhut Moori showed highest degree of tolerance to induced osmotic(More)
In the present investigation, effect of propyl gallate, a free radical scavenger, was studied on germination of Vigna radiata seeds to verify the role of active oxygen species in the regulation of seed germination. Propyl gallate inhibited germination and such inhibition was not due to osmotic effect as verified by the treatment with sucrose solution of(More)
1. Hydrilla twigs passed three stages of internal changes when subjected to desiccation, namely a shock stage, a recovery stage and a deteriorative or lethal stage culminating in death of the tissues. 2. The shock stage commenced immediately after desiccation, extending up to 4–12 h, and was characterized by temporary deteriorative changes, such as(More)
In plant establishment, seed germination is characterized by the emergence of a radicle for secured anchorage to the soil and nutrient and water uptake. Early growth of germinating axes appears to be gravisensitive, and the regulation of this process is largely uncharacterized, particularly in case of epigeally germinating species. Our previous work on the(More)