Abstract
Summary In wild oats (Avena fatua L.) an inverse relationship exists between the depth of dormancy of a given line and the level of inorganic phosphate (Pi) Present in the mature caryopsis. By controlling the supply of phosphate to the parental plants it is possible to adjust the endogenous levels of Pi present in the caryopses. Germination studies on the resulting caryopses indicated that in dormant wild oat lines a highly significant correlation existed between the levels of Pi present and the ease with which dormancy could be terminated. No such relationship was found for the non-dormant A. fatua or A. sativa lines studied. We suggest that Pi may participate in the regulation of dormancy through its involvement in key phosphorylation reactions during the processes of maturation and inhibition. The presence of adequate levels of Pi in critical regions of the caryopsis might well represent one limiting factor in the control of dormancy in the wild oat.
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