Abstract
Little is known about phosphorus metabolism in plants suffering from moisture stress. Several metabolic processes, which are completely dependent upon phosphorylated intermediates, are noticeably affected by moisture stress conditions. Photosynthetic rate decreases markedly in severely stressed plants (13). Rate of fixation of CO2 in the dark decreases (12). Above a diffusion pressure deficit (DPD) of about 5 atmospheres, incorporation of glucose into cell-wall polysaccharides decreases with an increase in DPD (10). Such observations indicated the importance of determining the effects of moisture stress on phosphorylated intermediates involved in these processes. In the present study, subterranean clover plants (Triofolium subterraneum L. cv. Mt. Barker) were subjected to a brief period of soil moisture depletion. Moisture stress caused decreases in a number of organic phosphorus compounds. Increases in concentrations of organic phosphorus compounds during a 24-hour period after irrigation indicated a partial recovery from the effects of moisture stress.
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