Distribution of sup 14 C-photosynthate in northern red oak: Leaf developmental and positional effects

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Plant Physiology, Supplement; (USA)

OSTI ID:6874711

Tomlinson, P T; Dickson, R E ^[1]

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1. Forestry Sciences Laboratory, Rhinelander, WI (USA)

Distribution of current photosynthate from first-flush leaves during seedling development in northern red oak is directly related to the stage of growth within the flush: 90% upwards during shoot growth and 95% downwards during lag. The pattern is similar for second-flush leaves, except only 55% of translocated {sup 14}C is allocated by 2nd-flush leaves to the developing 3rd flush. This change in allocation is probably related to the larger leaf area supporting the developing shoot. In addition, during active shoot growth, basal 2nd-flush leaves translocate twice as much {sup 14}C to lower stem and roots compared to apical leaves. Apical leaves allocate more to the developing shoot. These positional differences were not observed in lag plants. Thus, leaf position influences distribution of {sup 14}C-photosynthate only when shoot and root sinks are competing.

• OSTI ID: 6874711
• Journal Information: Plant Physiology, Supplement; (USA), Journal Name: Plant Physiology, Supplement; (USA) Vol. 89:4; ISSN PPYSA; ISSN 0079-2241
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
CARBOHYDRATES
CARBON 14 COMPOUNDS
CELL DIFFERENTIATION
CHEMICAL REACTIONS
DISTRIBUTION
GROWTH
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
LEAVES
MAGNOLIOPHYTA
MAGNOLIOPSIDA
OAKS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANT GROWTH
PLANTS
SEEDLINGS
SYNTHESIS
TISSUE DISTRIBUTION
TRACER TECHNIQUES
TREES