Abstract
Application of diazotrophic cyanobacteria, Anabaena variabilis, as biofertilizer for rice cultivation has a beneficial effect on crop productivity and maintenance of soil fertility. However, periodic applications of herbicides used to obtain high crop productivity are not only detrimental to weeds but to biofertilizer strains of cyanobacteria also. Therefore, research was undertaken to isolate four herbicide resistant strains (Arozin-R, Alachlor-R, Butachlor-R and 2,4-D-R) and a multiple herbicide resistant strain (MHR) of natural isolates of A. variabilis exhibiting resistance against these common rice field herbicides. The outdoor survivability of mutant strains and the productivity of rice crop (IR-36) were evaluated by inoculating the wild type and herbicide resistant mutant strains of A. variabilis in the presence and absence of recommended field dosages of test herbicides. No difference in survival and biofertilizer potentials of the herbicide resistant strains was observed in herbicide treated or in untreated conditions. Highest survivability (87%) was exhibited by MHR relative to other mutants. Highest growth and grain yield (76%) were recorded in plants treated with MHR as compared to uninoculated control rice plants. In conclusion, the mutant strains of A. variabilis had stable resistance to herbicides under outdoor conditions in flooded soils. Not only did the herbicide resistance strains increase growth of rice relative to the uninoculated pots, they were more beneficial for rice growth than the wild type strain.
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Abbreviations
- MHR:
-
Multiple herbicide resistant
- F. wt.:
-
Fresh weight
- Chl a :
-
Chlorophyll a
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Acknowledgement
Thanks are due to Head, Department of Biological Science, R.D. University, Jabalpur (Madhya Pradesh), India for facilities, Prof. P.K. Singhal for statistical analysis and U.G.C., New Delhi for financial assistance.
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Singh, S., Datta, P. Outdoor evaluation of herbicide resistant strains of Anabaena variabilis as biofertilizer for rice plants. Plant Soil 296, 95–102 (2007). https://doi.org/10.1007/s11104-007-9293-6
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DOI: https://doi.org/10.1007/s11104-007-9293-6