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Effect of Gamma Radiation on Morpho-physiological Characters of Soybean

S. Sarker
Bangladesh Agricultural Research Institute (BARI), Akbarpur, Moulvibazar

M. S. Rahman
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

M. R. Islam
Bangladesh Agricultural Research Institute (BARI), Rahmatpur, Barisal

S. Hasna
Bangladesh Agricultural Research Institute (BARI), Rahmatpur, Barisal

M. S. Islam
Accelerating Agricultural Productivity Improvement (APPI),International Fertilizer Development Center (IFDC), Faridpur

Abstract/ Executive Summary:

An experiment was carried out at the experimental farm of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh during the period from January, 2011 to April, 2011. The study was conducted to evaluate the effect of gamma radiation on morpho-physiological characters of BARI soybean. Four levels of gamma irradiation viz. 200, 300, 400 and 500 Gy ?-ray from 60C source and control were irradiated on assigned two genotypes viz. BARI soybean 5 and BARI soybean 6. Data for growth analyses were collected at different days after sowing. Results revealed that the soybean varieties and gamma irradiation significantly affected morpho-physiological characters where BARI soybean 5 and 200 Gy ?-ray levels produced the greater results alone or combinations. This combination produced the tallest plant (37.42 cm), maximum leaf and branch plant^-1 (23.15 and 2.10) at 75 DAS. 200 Gy ?-ray irradiated plants of BARI soybean 5 produced the highest seed yield (2373.70 kg ha^-1) followed by control treatment (1887.90 kg ha^-1) at the same variety. On the other hand, the plants consequential from 500 Gy ?-ray radiated of BARI soybean 5 had shown the lowest seed yield (1050.70 kg ha^-1). This result indicating that irradiation significantly decreased on seed yield with increasing doses of gamma rays. So, the variety BARI soybean 5 and 200 Gy ?-ray alone or combination had outstanding superiority for plant growth over the other gamma ray levels.

Keywords: Gamma radiation, Growth, Soybean

Location: The experimental farm of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh

Start Date: 00-11-2011

End Date: 00-04-2011

Program Area: Variety and Species

Commodity: Soybean

Objectives:

1. To select the suitable cultivar that ensures the higher growth and to find out the most advantageous gamma radiation dose in relation to growth characteristics among genotypes of BARI Soybean 5 and BARI Soybean 6.

Methodology:

Two genotypes of soybean viz. BARI Soybean- 5 and BARI Soybean- 6 were used as experimental materials for the study. All the genotypes were collected from Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur-1701. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The whole experimental area was divided into three equal blocks. Each block was then further divided into 10 plots where two soybean varieties were allotted at random according to 5 treatments. Thus there were 30 (2×5×3) unit plots altogether in the experiment. The size of unit plot was 3m × 1m. Row to row and plant to plant distances were 30 and 6 cm, respectively, in each plot. All manures and fertilizers were applied during final plot preparation. Cowdung was applied 15 days ahead of final land preparations. The whole amount of TSP, MP, Gypsum and half of Urea were applied as basal dose at the time of final land preparation. The remaining half of the urea was top dressed in splits at 30 days after sowing. Seeds of soybean irradiated with five different doses of gamma rays were sown by hand at 3-4 cm depth. Seeds were sown on 19th January, 2011. Few seedlings were grown in the border of the plots as stock seedling for gap filling subsequently. Soon after emergence the soybean seedling were infested by cutworms and hairy caterpillars (Diasrisia obliqua). Hand picking of cutworm larvae and spraying of Sevin 85WP @4.2 kg ha^-1 were done as control measures. The attack of sclerotia was controlled by using ash at the base of the plants about 1-2cm below the soil followed by light irrigation with the help of water can. Ten random selected plants of a plot were tagged carefully for recording necessary morphological parameters. This process was followed for all the plots individually. Seed yield was taken on individual plot basis at moisture content of 12% and converted into kg ha^-1. The data obtained from experiment on various parameters were statistically analyzed in MSTAT-C computer program. The mean values for all the parameters were calculated and the analysis of variance for the characters was accomplished by Duncan’s Multiple Range Test (DMRT) and the significance of difference between pair of means was tested by the Least Significant Differences (LSD) test at 5 % levels of probability.

Source of Information: J. Environ. Sci. & Natural Resources, 7(2): 25–30, 2014; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It was observed that the variety BARI soybean 5 and 200 Gy ?-ray irradiated plants had outstanding dominance on growth and yield over other variety and gamma rays. In contrast, 500 Gy ?-ray had the adverse effect on growth in BARI soybean 6.

Knowledge Management: Journal