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• W2185997855 abstract "It has been long known that plants are sensitive to ionizing radiations such as beta particles and gam ma rays. Seeds or unfertilized flower buds and whole plant or part of it have been irradiated in order to investigate the effects of these radiations on crop plants. Studies have shown that radiation of different types at various intensities can either inhibit growth or kill the plant completely. The ra diosensitivities of different plants vary greatly according to source of radiation. In present investigation, nine popul ar rice varieties cultivated in Andhra Pradesh, wer e used to examine varietal differences in radio sensitivity t o gamma radiation during the wet season of 2012. Dr y seeds of Nine rice varieties BPT 5204 (Samba mahsuri), JGL 3), Surekha, Vijetha (MTU- 1001), JG L 1798 (Jagithal Sannalu), NLR 34449, Swarna, MTU 1010 (Co ttondora sannalu) and Erramallelu (WGL 20471)) were exposed to gamma radiation ranging from 0.20 kGy to 2.00 kGy using continuous gamma sterilization pla nt (GC 5000, designed by Board of Radiation & Isotope Tech nology, Mumbai) with 444 TBq (12000Ci) and Cobalt ‐ 60 source at Quality Control Laboratory, Acharya N. G. Ranga Agricultural University, Rajendranagar, Hyde rabad500 030 with a specific activity of 2.64 kGy hr -1 , to determine their response to radiation stress and the effective radiation dose for identification of Lethal dose 50 (LD 50 ). Data on germination parameter was generated as per [10]. Percentage germination was measured on 7 th day after germination in irradiated sample. The re sults indicated that increasing doses of gamma irradiation had sign ificant effect on germination for the first seven d ays under laboratory conditions. With increase in radiation a bove 0.80 kGy a reduction in percentage of germinat ion under laboratory conditions was observed in irradiated se eds as compared to control. Increase in gamma ray d oses from 0.20kGy to 0.60 kGy had little or no effect on germ ination percentage as there were no significant dif ferences in germination percentage of irradiated seeds and non- irradiated (control) for all the varieties evaluate d. The LD 50 values determined from linear regression analysis (fit using Origin Pro 8 software) based o n percentage of germination ranged from 0.89 kGy (JGL 1798) to 1 .88 kGy (Vijetha). The varieties JGL 1798 and BPT 5 204 had highest radiosensitivity while Vijetha and Surekha were relatively tolerant. However, the varieties MT U 1010 (1.66kGy), Erramallelu (1.57 kGy), Swarna (1.56 kGy ), JGL 384 (1.38 kGy) and NLR 34449 (1.32 kGy) are moderately tolerant. These ranges of LD 50 values determined for the different rice varieties could be useful in rice varietal improvement programmes." @default.
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• W2185997855 date "2011-01-01" @default.
• W2185997855 modified "2023-09-28" @default.
• W2185997855 title "Gamma radiosensitivity study on rice (Oryza sativa L.)" @default.
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