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AbstractLeaf movements of bush bean plants were studied at the relatively low photon flux density of 0.2mmol/m2 per s, and air temperatures of 25 and 35C in a growth chamber. A beta-ray gauge system was used to monitor continuously pulvinus water status and bending. Leaf angles were below the horizontal and were linearly related to the soil water content (R0.91 at 25C and R0.93 at 35C). The beta-ray...