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Asian Journal of Plant Sciences
Year: 2003  |  Volume: 2  |  Issue: 9  |  Page No.: 702 - 707

Effect of Post-irradiation Storage on the Radiation-induced Damage in Onion Seeds

Muhammad Amjad and Muhammad Akbar Anjum    

Abstract: Seeds of onion (Allium cepa L.) cv. Ailsa Craig were irradiated at various doses of gamma radiation (0, 10, 20, 40, 80 and 100 krad) and either tested immediately or stored for 24 h at 25oC before testing. Seed viability, final germination percentage, germination speed and seedling growth decreased, while electrical conductivity (EC) of seed leachates, time to complete 50% germination (T50), and percentage of abnormal seedlings increased with increase in radiation dose. After 24 h of storage, percentage of abnormal seedlings increased significantly, while root and overall seedling lengths were decreased. However, seed viability, EC of seed leachates, seed germination percentage, germination speed, T50 and shoot growth were unaffected by the storage. It was concluded that after storage, the damaging effect of irradiation was increased due to the continued effect of radiation.

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