A Preliminary Study on Gamma Radiosensitivity of Tomato (Lycopersicon esculentum) and Okra (Abelmoschus esculentus)
Norfadzrin, F.; Ahmed, O. H.; Shaharudin, S.; Rahman, D. Abdul
November 2007 International Journal of Agricultural Research;2007, Vol. 2 Issue 7, p620
This investigation was carried out to determine the LD50 and effect of gamma ray on germination, plant height, survival percentage and dry weight of seedlings derived from irradiated seeds of tomato (Lycopersicon esculentum) and okra (Abelmoschus esculentus). Seeds of tomato and okra were treated with 300, 400, 500, 600 and 800 Gy gamma rays at Malaysian Institute of Nuclear Technology (MINT). The treated seeds including control were sown in sand beds in size 4.6�0.7 m� in a greenhouse at Horticulture Unit, UPMKB. Water was applied manually to maintain the soil moisture at field capacity as well as weed was manually controlled. The experiment was designed as 5�6 factorial in Completely Randomized Design (CRD) with three replications. Lethal dose 50% of population (LD50) was assayed. Observation showed that germination percentage, plant height, survival percentage and shoot dry weights of tomato and okra decreased with increasing dose of gamma ray. The 800 Gy gamma ray dose had a profound effect on these variables perhaps due to injury dose may have caused to the seeds of the tomato and okra. This resulted in poor plant growth and development. The LD50 for survival and germination percentage were within acceptable range. In general, higher gamma ray doses particularly 600 and 800 Gy had negative effect on the morphological characteristics of tomato and okra seedlings derived from irradiated seeds.