Natural tolerance of some rice field diazotrophic cyanobacteria on exposure to herbicide Bispyribac-sodium

As cyanobacteria are beneficial for rice crops as as biofertilizer,it becomes necessary to study the effect of different herbicides commonly used on the growth and survivability of these microorganisms.we studied effect of herbicide bispyribac sodium(commonly known as Nomnigold) on four selected strains namely Anabaena circinalis, Scytonema hofmanni, Aulosira prolifica and Tolypothrix fragilis isolated from soil samples obtained from rice fields of four sites of Kuthilia farm,Rewa.Maximum deleterious effect was found at 300ppm of herbicide Nomnigold but at 75ppm decrement rate of survived colonies of Anabaena and Scytonema reduced and showed regeneration in Aulosira and Tolypothrix which also affected their chlorophyll and Nitrogen contents were obtained maximum (0.475mg/l and 0.3984mg/l Chl'a') and( 10.27mg/l and 11.74 mg/l N2) at 75 ppm which is minimum dose of Nomnigold (22.5-30g/Ha) found suitable for crops as well as for the cyanobacteria present.

[1]  M. Potts,et al.  Introduction to the Cyanobacteria , 2012 .

[2]  A. Ugur,et al.  Influence of bispyribac sodium on nitrogenase activity and growth of cyanobacteria isolated from paddy fields , 2011 .

[3]  J. Mei,et al.  Analysis of the Herbicide Bispyribac-sodium in Rice by Solid Phase Extraction and High Performance Liquid Chromatography , 2011, Bulletin of Environmental Contamination and Toxicology.

[4]  K. Hurle,et al.  Herbicide Use and Resistance in Rice Fields of Sri Lanka , 2011 .

[5]  Inderjit,et al.  Effect of herbicides with different modes of action on physiological and cellular traits of Anabaena fertilissima , 2010, Paddy and Water Environment.

[6]  Xue Ci.  Deternimation of the amount of nitrogen in cyanobacteria by Kjeldahl method , 2010 .

[7]  G. Dönmez,et al.  Influence of Nitrate, Phosphate and Herbicide Stresses on Nitrogenase Activity and Growth of Cyanobacteria Isolated from Paddy Fields* , 2007 .

[8]  A. Cid,et al.  Removal of triazine herbicides from freshwater systems using photosynthetic microorganisms. , 2006, Environmental pollution.

[9]  Surendra Singh,et al.  Screening and selection of most potent diazotrophic cyanobacterial isolate exhibiting natural tolerance to rice field herbicides for exploitation as biofertilizer , 2006, Journal of basic microbiology.

[10]  Surendra Singh,et al.  Growth and survival potentials of immobilized diazotrophic cyanobacterial isolates exposed to common ricefield herbicides , 2005 .

[11]  C. Preston.  Herbicide resistance in weeds endowed by enhanced detoxification: complications for management , 2004, Weed Science.

[12]  A. Fischer,et al.  Mechanisms of Resistance to Bispyribac-Sodium in an Echinochloa phyllopogon Accession , 2000 .

[13]  P. Caux,et al.  Comparative study of the effects of MCPA, butylate, atrazine, and cyanazine on Selenastrum capricornutum. , 1996, Environmental pollution.

[14]  C. Luna,et al.  Influence of pH, light intensity and oxygen on the short-term effect of ammonium on nitrogenase activity of cyanobacteria from rice fields , 1993 .

[15]  F. Leganés,et al.  Effects of phenoxy acetic herbicides on growth, photosynthesis, and nitrogenase activity in cyanobacteria from rice fields , 1992, Archives of environmental contamination and toxicology.

[16]  I. Lundkvist.  Effect of two herbicides on nitrogen fixation by blue-green algae. , 1970 .