Two cDNAs encoding putative phosphatidate phosphatases (PAPs) designated VuPAP-α and VuPAP-β were cloned in cowpea (Vigna unguiculata L.) leaves. The predicted proteins have six membrane-spanning regions in common with animal type-2 PAPs. Unlike VuPAP-β, VuPAP-α has an N-terminal transit peptide and is targeted in vitro to the chloroplasts. Gene expression of VuPAP-β is stimulated by rapid air-desiccation of leaves and VuPAP-α transcripts increase during rehydration of plants exposed to drought-like conditions.

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