Developmental and environmental effects on assimilate partitioning in Canada thistle

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

OSTI ID:6611186

Tworkoski, T J ^[1]

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1. Dept. of Agriculture, Frederick, MD (USA)

Canada thistle (Cirsium arvense) plants at three stages of development (rosette, bolt, and flower bud) were grown under spring-simulated or fall-simulated environments. Sucrose export from a single leaf exposed to {sup 14}CO{sub 2} was significantly greater in rosette-plants than bolt- or flower bud-plants during the first two hours after pulse. Twenty-four hours after pulse, total {sup 14}C translocation (dpm) was the same in both environments but the {sup 14}C concentration (dpm/gm) was greater in roots of fall-grown plants. Shoot meristem respiration of fall-grown plants was approximately 50% less than spring-grown plants and was a factor responsible for this trend. Concentrations of inulin and water-insoluble starch were greater in roots of fall-grown than spring-grown plants and pulsed {sup 14}C accumulated in these fractions. The results suggest that a shift in respiration and metabolism of fall-grown rosette- and bolt-plants leads to increased assimilate movement to the root which may have practical implications for control of this weed.

• OSTI ID: 6611186
• Journal Information: Plant Physiology, Supplement; (USA), Vol. 89:4; ISSN 0079-2241
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
WEEDS
PHOTOSYNTHESIS
CARBON 14 COMPOUNDS
PLANT GROWTH
PLANT STEMS
RESPIRATION
ROOTS
SACCHAROSE
TRACER TECHNIQUES
TRANSLOCATION
CARBOHYDRATES
CHEMICAL REACTIONS
DISACCHARIDES
GROWTH
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
SACCHARIDES
SYNTHESIS
550201* - Biochemistry- Tracer Techniques