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Concurrent session VIII : RICE AND CLIMATE CHANGE-CHANGING PEST AND DISEASE SCENARIO
Chairman : Dr. P.Vidyasekaran
Co-Chairman : Dr.E.I.Jonathan
Rapporteurs : Dr. G.Chandrasekar and Dr.M.Sivakumar
Lecture 1 : "Development of virus resistance in rice against rice tungro bacilliform virus and use of the viral DNA as a tool in transient gene silencing for rice fuctional genomics" by Dr.Indranil Das Gupta, UDSC.
The paper focused on the two objectives of developing transgenic resistance against RTBV and developing viral DNA of RTBV as a tool for the transient gene silencing. The transgene developed in Pusa Basmathi background has been successfully transferred to the popular varieties of Tamil Nadu viz., ASD 16, CR1009 and BPT 5204 and two popular varieties of West Bengal. In West Bengal BC2F3 population was confirmed for the presence of transgene and has been also phenotyped
against RTBVirus. In Tamil Nadu, BC2F3 population has been confirmed for the presence of transgene. The viral DNA RTBV has been reported to be a best tool for silencing the genes.
Lecture 2 : "Toxicity evaluation of Indigenous Bacillus thrungenesis isolates against
Rice Pink Bollworm" presented by Dr.M.Mohan.
The toxicity evaluation revealed that out of 76 Bt isolates tested, 30 of them have exhibited larval mortality above 75%. The larval growth inhibition ranged from 52.5% to 95.3%. The population exhibited variation with regard to esterase bands E3,E5,E6,E10 and E11. Hence a careful selection of cry gene for the construction of Bt gene is essential for the better management of emerging Pink Borer problem in rice.
Lecture 3 : "Age factor influence of the resistance against rice bacterial blight disease" by Dr. Aishwarya Baghal
The studies indicated the maximum disease incidence occurred at boot leaf stage. The genotypes IRBB 52, CRMA 32231-3‘, IRBB 55,IRBB 54 and CRMAS 2231-34 had the least infection of the BLB and TN 1,IR 8,Tetep, IR 24 and IR 64 had the maximum infection of BLB. The overall general mean of the genotype response at different growth stages clearly indicated that maximum bacterial blight disease incidence occurred from boot leaf stage to flowering stage followed by the
seedling stage and maximum tillering stage.
X A careful selection of cry gene for the construction of Bt gene is essential for the better management of emerging Pink Borer problem in rice.
X The overall general mean of the genotype response at different growth stages clearly indicated that maximum bacterial blight disease incidence occurred from boot leaf stage to flowering stage followed by the seedling stage and maximum tillering stage.This finding is very useful for evaluation of genotypes for BLB resistance.