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Articles

Translocation of Photosynthate in Curly Top Virus-infected Tomatoes ¹

^a Department of Plant Pathology, University of California, Berkeley, California 94720

Photosynthate translocation in single leaflets of healthy and curly top virus-infected tomatoes was investigated using ¹⁴C as a marker. The amount of radioactivity found in plant parts not exposed to ¹⁴CO₂ was substantially lower in diseased than in healthy plants. The time lag for the appearance of ¹⁴C in the petiole was considerably longer in the infected plants than in the healthy. The kinetics of disappearance of ¹⁴C from the lamina during the 24-hour period following labeling showed a strong retention of recent assimilates within the diseased leaf, not accompanied by increased immobilization into insoluble forms. Sucrose was the predominant compound participating in photosynthate transport in both healthy and diseased leaves. The amount of ¹⁴CO₂ fixed was approximately 40% lower in curly top virus-infected leaves than in healthy leaves.

¹ This study was supported in part by United States Department of Agriculture Cooperative Agreement No. 12-12-8456(34), and by a North Atlantic Treaty Organization postdoctoral fellowship and Grant 115.0509.05154 of Consiglio Nazionale delle Richerche, Roma, Italy.