Partitioning of photosynthate within and distal to the growth zone of tall fescue leaf blades

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

OSTI ID:6650496

Allard, G; Nelson, C J ^[1]

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1. Univ. of Missouri, Columbia (USA)

The growth zone of developing tall fescue leaf blades, consisting of zones of cell division, cell elongation and cell maturation, are a strong sink for photosynthate. Distribution of {sup 14}C along the growth zone and partitioning between water-soluble carbohydrates (WSC) and WSC-free dry matter (SDM) were observed for up to 64 h after labelling the youngest fully expanded leaf or the exposed tip of the elongating leaf with {sup 14}CO{sub 2}. Deposition rates of {sup 14}C were estimated using the continuity equation. The cell elongation zone, especially the WSC fraction, was the strongest sink for {sup 14}C. In the proximal end of the maturation zone, partitioning of {sup 14}C shifted from being allocated mainly to the WSC fraction after 2 h to an equal distribution between WSC and SDM at the distal end of the zone after 64 h. A significant proportion of {sup 14}C in the SDM fraction of the maturation zone could be attributed to redistribution from WSC.

• OSTI ID: 6650496
• 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
ELONGATION
GRASS
GROWTH
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
LEAVES
LILIOPSIDA
MAGNOLIOPHYTA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANT GROWTH
PLANTS
SYNTHESIS
TRACER TECHNIQUES