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The root is the primary sensing organ for potassium (K) and water availability and thus we test the hypothesis that K may influence root architecture and contribute to drought tolerance under moisture stress. Rice seedlings failed to maintained favourable root architecture with low K under water stress and more reduction was observed in root projected area, maximum width, width to depth ratio. High K helps to maintain root top and bottom angle and reduce root steepness under mild water stress, however, high K supply does not warrant higher water productivity. In severe water stress, the steepness was more regulated by water than K availability.

No abstract