Sugar infusion into trees: A novel method to study tree carbon relations and its regulations.

phloem infusion Xylem infusion but not phloem infusion led to increased tissue δ 13 C levels in the greenhouse experiment with bonsai Ficus trees ( Figure 2 ), and the respiration experiment with young maple trees showed also highly significant effects of xylem infusion on the Δδ 13 C values of shoot dark respiration ( Figure 5 ).

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