CO sub 2 enrichment of tomatoes: Relationship of foliar stress symptoms to starch concentrations and carbon exchange rates

Conference · Tue May 01 04:00:00 EDT 1990 · Plant Physiology, Supplement; (USA)

OSTI ID:5850105

Tripp, K; Peet, M; Pharr, D M; Willits, D ^[1]

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1. North Carolina State Univ., Raleigh (USA)

CO{sub 2} enrichment of tomatoes results in a seasonally progressive downrolling, chlorosis and purpling of foliage, beginning with the older leaves, but eventually including the entire plant. This deformation has generally been attributed to excess starch. In a comparison of 2 cultivars given CO{sub 2} enrichment and treatments modifying source/sink ratios (fruit pruning, high night temperatures, decreased rooting volume), however, changes in deformation could not be related to changes in foliar starch concentrations. While CO{sub 2} enriched plants had higher foliar starch and greater foliar deformation, deformation increased over the season while starch decreased. Carbon exchange rates (CER) were low in lower canopy leaves, whether deformed or not. CO{sub 2} enrichment resulted in only slightly higher photosynthetic rates. Over all treatments and sampling data there was no relationship between foliar deformation and CER.

• OSTI ID: 5850105
• Report Number(s): CONF-9007196--
• Conference Information: Journal Name: Plant Physiology, Supplement; (USA) Journal Volume: 93:1
• Country of Publication: United States
• Language: English

Related Subjects

550800* -- Morphology
551000 -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
CARBOHYDRATES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DEFORMATION
FOOD
FRUITS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
POLYSACCHARIDES
REAGENTS
SACCHARIDES
STARCH
SYNTHESIS
TOMATOES