Photosynthesis, respiration and translocation in green fruit of normal and mutant grapefruit. [Citrus paradisi Macf]

Conference · Tue Apr 01 00:00:00 EST 1986 · Plant Physiol., Suppl.; (United States)

OSTI ID:5096262

Koch, K E; Yen, C R; Avigne, W T

Gas exchange, /sup 14/CO/sub 2/ fixation/and subsequent photosynthate translocation were followed during a 24h light/dark period in green grapefruit (Citrus paradisi Macf.) detached after 2.5 mo. growth. Fruit photosynthesis could account for net fixation of less than 1% of the daily dry weight increase recorded for fruit at this stage of development, but a comparison of light/dark CO/sub 2/ exchange indicated that as much as 27% of this daily gain was maintained by refixation of respiratory CO/sub 2/ during daylight hours. Approximately 10% of photosynthates labeled in the outer peel (flavedo) were translocated to segment epidermis and juice vesicles of normal fruit during 1 + 23h pulse-chase experiments. This process typically continues for 4 to 5 days and refixation products would presumably follow the same path. In a low-acid mutant believed to differ only in acid/sugar ratio of juice vesicles, however, inward translocation of /sup 14/C-photosynthates from flavedo was restricted primarily to the inner peel (albedo).

• Research Organization: Univ. of Florida, Gainesville
• OSTI ID: 5096262
• Journal Information: Plant Physiol., Suppl.; (United States), Vol. 80:4; Conference: Annual meeting of the American Society of Plant Physiologists, Baton Rouge, LA, USA, 8-12 Jun 1986
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
GRAPEFRUITS
MUTANTS
PHOTOSYNTHESIS
RESPIRATION
RIPENING
CARBON 14 COMPOUNDS
CARBON DIOXIDE
CARBON DIOXIDE FIXATION
LABELLING
RADIONUCLIDE KINETICS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
FOOD
FRUITS
LABELLED COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
SYNTHESIS
550201* - Biochemistry- Tracer Techniques