Unusual carbon partitioning during phosphate deficiency in celery, a mannitol-synthesizing species

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

OSTI ID:7027053

Tyson, R H; Loescher, W H ^[1]

---

1. Washington State Univ., Pullman (USA)

Mannitol and sucrose are the main photosynthetic products and translocated carbon compounds in celery (Apium graveolens L.). Carbon partitioning was studied in greenhouse-grown celery plants supplied with a nutrient solution containing or lacking phosphate (P). P-deficient plants developed new leaves at about the same rate as control plants, but showed greatly reduced growth of leaves and petioles; root growth was apparently unaffected. P-deficient leaves contained less mannitol and more sucrose than control leaves. Starch content increased with P-deficiency only in mature (the most photosynthetically-active) leaves, and then amounted to less than 10 mg/g fresh weight. Similarly, when {sup 14}CO{sub 2} was supplied to intact plants, P-deficient leaves contained less label in mannitol and more in sucrose than did control leaves; labeling of starch changed little. The P-status of celery leaves apparently affects the partitioning of carbon between mannitol and sucrose more than it affects starch accumulation. This is in marked contrast to the large increase in starch content commonly observed during P-deficiency in species that produce and translocate predominantly sucrose.

• OSTI ID: 7027053
• 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
PHOSPHATES
BIOLOGICAL EFFECTS
CARBON 14 COMPOUNDS
CARBON DIOXIDE
LEAVES
PHOTOSYNTHESIS
PLANT GROWTH
PLANTS
ROOTS
SACCHAROSE
TRACER TECHNIQUES
TRANSLOCATION
VEGETABLES
CARBOHYDRATES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DISACCHARIDES
FOOD
GROWTH
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
PHOTOCHEMICAL REACTIONS
SACCHARIDES
SYNTHESIS
550201* - Biochemistry- Tracer Techniques