Abstract
The air dried seeds of T. arjuna were exposed to 100Gy, 200Gy, 400Gy and 600Gy gamma irradiation doses from a 60Co γ-irradiation source. The results showed that, the chlorophylla, chlorophyllb and total chlorophyll content in the leaves of T. arjuna raised significantly (p≤ 0.05) by lower γ-irradiation doses (100Gy & 200Gy). Under all the treatments and in control, the carbon assimilation rate (photosynthetic rate) raised to its maximum value around 11:00am where from a steady fall in it was observed respectively. Stimulation in the net photosynthetic assimilation rate was recorded under 100Gy and 200Gy doses. The stomatal conductance (GS) and average transpiration rate was increased by 100Gy and 200Gy treatment. In contrast, the higher γ-irradiation dose (above 200Gy) decreased these parameters significantly (p ≤ 0.05). This study provides the basic information of the impact of gamma radiations on the photosynthetic responses of T. arjuna and its radiosensitivity.
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