SummaryTwo stimuli that have been associated with nutrient remobilization in plants are phosphate (P=) atarvation and senescence. Little is known about how the nutrient remobilization machinery is Induced at the molecular level, but in the case of P, starvation, ribonucleases are considered to play important roles in the remobilization process. Here, the control of two closely related ribonuclease genes of Arabidopsis, RNS1 and RNS3 is investigated. The RNS1 gene is sharply induced during starvation for Pi, an effect specific among the major macronutrients, whereas RNS3 transcript levels remain relatively constant. RNS1 and RNS3 produced in yeast co-migrate with

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