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Sarada, Dronamraju V. L.
- Seaweed Extracts Control the Leaf Spot Disease of the Medicinal Plant Gymnema Sylvestre
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Authors
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1 Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai - 600 025, IN
1 Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai - 600 025, IN
Source
Indian Journal of Science and Technology, Vol 1, No 3 (2008), Pagination: 1-5Abstract
Antimicrobial screening of 12 different seaweeds extracts namely Chaetomorpha antennina, Dictyota dichotoma, Enteromorpha flexuosa, Laurencia obtusa, Gracilaria corticata, Gracilaria verrucosa, Grateloupia lithophila, Padina boergesenii, Sargassum wightii, Turbinaria conoides, Halimeda tuna and Ulva lactuca was carried out in vitro. The crude extracts were tested against the phytopathogenic bacterium- Pseudomonas syringae causing leaf spot disease of the medicinal plant Gymnema sylvestre. The methanolic extracts of Sargassum wightii showed maximum activity followed by ethyl acetate compared to that of other organic solvent- extracts. Thus, this investigation throws fresh light on the appropriate usage of solvent extraction method in preparing potent biopesticide.Keywords
Gymnema Sylvestre, Seaweed Extracts, Plant Pathogenic Bacteria, Leaf Spot Disease, Pathogenicity, Pseudomonas SyringaeReferences
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- A Comparative Study on the Hydrography of the Coast of Chennai
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PDF Views:107
Authors
Affiliations
1 Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai-600 025, IN
1 Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai-600 025, IN
Source
Indian Journal of Science and Technology, Vol 1, No 5 (2008), Pagination: 1-6Abstract
Surface seawater samples were collected from two different stations along the Coast of Chennai, Station-1, the Ennore Coast where the fly ash effluent from the Ennore Thermal Power Station (ETPS) is directly discharged into the water and Station 2, the Kovelong Coast which is free from such point sources of pollution. Samples were collected between 8.00 a.m. and 9.00 a.m. during low tide from the two sampling Stations for a period of two years i.e. from April 2005 to March 2007. Samples were analyzed for temperature, pH, salinity, different forms of alkalinity (total alkalinity, carbonate alkalinity and total CO2) Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), ammonia nitrogen (NH3-N), nitrite nitrogen (NO2-N) and nitrate nitrogen (NO3-N), and phosphate phosphorous (PO4-P) and N: P ratios. All the parameters studied except salinity and DO were high at Station 1 when compared to Station 2. Further wide fluctuations in the various physico chemical parameters studied were also recorded in samples collected from Station 1.Keywords
Chennai, Coastal Pollution, Water QualityReferences
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