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Effects of Defoliation in the Developing Leaf Zone on Young Populus X euramericana Plants. II. Distribution of 14C-Photosynthate after Defoliation

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Abstract:

Patterns of 14C-photosynthate distribution in growth chamber-grown Populus x euramericana cv. "Negrito de Granada" were determined 24 h, 3 weeks, and 5 weeks after defoliation in the developing leaf zone. Translocation patterns were determined by exposing leaves below, within, or above the defoliated zone to 14CO2 and determining 14C distribution within the plant after 48 h. Translocation patterns were altered within 24 h after defoliation. When leaves below or remaining tissue of leaves within the zone of defoliation were exposed to 14CO2, a greater percentage of 14C-photosynthate was transported to the expanding shoot and lateral branches and less to the roots in defoliated plants compared to controls. Little difference between defoliated and control plants in 14C distribution occurred when new leaves produced subsequent to defoliation were exposed to 14CO2. By 5 weeks after defoliation there was little difference in patterns of 14C distribution between defoliated and control plants. These results substantiate biomass partitioning data which showed that a single defoliation of young poplar plants did not affect diameter or height growth, whereas leaf growth was stimulated and root growth reduced. Forest Sci. 31:358-366.

Keywords: Translocation; development; growth

Document Type: Journal Article

Affiliations: Professor, Department of Forestry, Michigan State University, East Lansing, MI 48824

Publication date: June 1, 1985

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