Correlation of stomatal conductance with photosynthetic capacity of cotton only in a CO sub 2 -enriched atmosphere: Mediation by abscisic acid. [Gossypium Hirsutum L]

Journal Article · Thu Dec 01 00:00:00 EST 1988 · Plant Physiology; (USA)

DOI:https://doi.org/10.1104/pp.88.4.1058· OSTI ID:6998926

Radin, J W; Hartung, W; Mauney, J R ^[1]; Kimball, B A ^[2]

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1. Western Cotton Research Lab., Phoenix, AZ (USA)
2. Water Conservation Lab., Phoenix, AZ (USA)

Some evidence indicates that photosynthetic rate (A) and stomatal conductance (g) of leaves are correlated across diverse environments. The correlation between A and g has led to the postulation of a messenger from the mesophyll that directs stomatal behavior. Because A is a function of intercellular CO{sub 2} concentration (c{sub i}), which is in turn a function of g, such a correlation may be partially mediated by c{sub i} if g is to some degree an independent variable. Among individual sunlit leaves in a cotton (Gossypium hirsutum L.) canopy in the field, A was significantly correlated with g. The relative photosynthetic capacity of each leaf was calculated as a measure of mesophyll properties independent of c{sub i}. This approach revealed that, in the absence of c{sub i} effects, mesophyll photosynthetic capacity was unrelated to g. When plants were grown in an atmosphere enriched to about 650 microliters per liter of CO{sub 2}, however, photosynthetic capacity remained strongly correlated with g even though the procedure discounted any effect of variable c{sub i}. This residual correlation implies the existence of a messenger in CO{sub 2}-enriched plants. Enriched CO{sub 2} also greatly increased stomatal response to abscisic acid (ABA) injected into intact leaves. The data provide no evidence for a messenger to coordinate g with A at ambient levels of CO{sub 2}. In a CO{sub 2}-enriched atmosphere, though, ABA may function as such a messenger because the sensitivity of the system to ABA is enhanced.

• OSTI ID: 6998926
• Journal Information: Plant Physiology; (USA), Vol. 88:4; ISSN 0032-0889
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ABSCISIC ACID
BIOLOGICAL EFFECTS
CARBON DIOXIDE
COTTON PLANTS
PHYSIOLOGY
LEAVES
PHOTOSYNTHESIS
STOMATA
AUXINS
CARBON COMPOUNDS
CARBON OXIDES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MONOCARBOXYLIC ACIDS
OPENINGS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANT GROWTH REGULATORS
PLANTS
SYNTHESIS
551000* - Physiological Systems
560300 - Chemicals Metabolism & Toxicology