Abstract
Summary A controlled cycle of water stress reduced the dawn leaf water potential of Capsicum annuum plants from a value of - 0.25 MPa when the water supply was unlimited to between -0.55 and -0.65 MPa. Initially, leaf osmotic potential also decreased such that leaf turgor was maintained. After 4-5 days without added water leaf turgor fell following a considerable reduction in osmotic adjustment. Plants suffering a very mild degree of water stress which developed slowly over 3-4 days had leaf inorganic phosphate and total phosphorus levels significantly lower than the control plants. The organically-bound phosphorus fraction was not quantitatively affected. Low leaf phosphate levels correlated closely with soil water content and were almost certainly a consequence of reduced phosphate uptake. Plants stressed osmotically under conditions where the phosphorus supply was more plentiful than in dry soil were less severely affected.
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