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One of the major problems associated with rice cultivation and production is the deficiency of water resources. In here the effect of drought stress on growth, protein-, proline-, pigment contents and antioxidant enzymes activities in rice var. BRRI Dhan-24 was determined and analyzed under drought and wellwatered condition. Drought stress caused the decrease of growth and pigment contents chlorophyll-a, b, a/b, total chlorophyll and carotenoids content of leaves of rice plants. On the other hand, the accumulation of protein, proline contents and antioxidant enzymes activities was increased under drought stress. It may be suggested that antioxidant enzymes activities and proline accumulation were associated with the growth of the plant and consequently with the mechanisms of drought tolerance in rice. Introduction Rice (Oryza sativa L.) is the most important cereal crop in the world and it is the primary source of food and calories for about half of the mankind(1). It is a nutritious cereal crop, provides 20% calories and 15% protein requirements of world population. Rice grows in the tropics, subtropics, semi-arid tropics and temperate regions of the world. More than 90% of the world’s rice production is in Asia(2). Bangladesh is the 4th largest rice producer in the world. It covers about 77% of agricultural land and engages about 70% of population in rice production activities (Hand Book of Agricultural Technology 2013). Drought is one of the major abiotic stresses that severely affect and reduce the yield and productivity of food crops worldwide up to 70%(3). Droughts, being the most important environmental stress, severely impair plant growth and development, limits plant production and the performance of crop plants, more than any other environmental factors(4). The response of plants to drought stress is complex and involves changes in their morphology, physiology and metabolism. Reduction of plant *Author for correspondence: <sahashukanta@gmail.com, saha.s@bot.jnu.ac.bd> 1Department of Botany, University of Dhaka, Dhaka‐1000, Bangladesh.

Impacts of drought stress on growth, protein, proline, pigment content and antioxidant enzyme activities in rice (Oryza sativa L. var. BRRI dhan-24)