Abstract
The effects of water availability on growth, water relations and related plant physiological and biochemical activities of young Tongkat Ali (Eurycoma longifolia jack) plants were investigated. Plant vegetative growth was inhibited with reduced water availability. Leaf water potential and relative water content were reduced with increasing soil water stress. The rate of photosynthesis in Tongkat Ali leaves decreased in response to the stress treatments especially from moderate stress (75%FC), to severe stress (25% FC), compared with the control. Stomatal conductance of Tongkat Ali also steadily decreased with increasing the water stress Due to low water potentials and respectively reduce photosynthesis rate of Tongkat Ali therefore increasing stomatal diffusive resistance in the water deficit led to decline of transpiration rate in young seedling of EURYCOMA LONGIFOLIA JACK.
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