Ozone sensitivity in sweet corn (Zea mays L. ) plants: a possible relationship to water balance

Journal Article · Thu Oct 01 04:00:00 EDT 1981 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.68.4.885· OSTI ID:5763073

Harris, M J; Heath, R L

Stomatal characteristics affecting gas exchange were compared in two sweet corn hybrids (var. Bonanza and Monarch Advance) which differ in foliar ozone sensitivity. No significant differences were observed in stomatal frequencies, guard cell lengths, or conductances to water vapor diffusion. When plant water status was compared, leaf-water potentials for the ozone-resistant cultivar, Bonanza, were lower. A comparison of the relationship between soil- and leaf-water potential indicated that the leaf-water potential of Bonanza was more sensitive to declines in soil-water potential. Additionally, a comparison of stomatal conductance to water vapor diffusion as soil moisture declined and following root detachment indicated that stomata of Bonanza were, likewise, more sensitive to increasing water stress. Data suggest that these differences are attributable to a greater shoot-to-root fresh weight ratio and higher resistance to water movement in the water-conducting tissues for Bonanza. Our observations suggest that root and water delivery system characteristics play a major contributory role in the determination of foliar ozone sensitivity in this species.

• Research Organization: Univ. of California, Riverside
• OSTI ID: 5763073
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 68:4; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

553001* -- Agriculture & Food Technology-- Tracer Techniques-- (-1987)
60 APPLIED LIFE SCIENCES
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CEREALS
COUNTING TECHNIQUES
DATA
DIAGNOSTIC TECHNIQUES
EXPERIMENTAL DATA
GRAMINEAE
GRASS
HYDROGEN COMPOUNDS
INFORMATION
ISOMERIC NUCLEI
LABELLED COMPOUNDS
LEAVES
MAIZE
MOISTURE
NUCLEI
NUMERICAL DATA
OXYGEN COMPOUNDS
OZONE
PLANTS
RADIOISOTOPE SCANNING
SCINTISCANNING
SENSITIVITY
TRITIUM COMPOUNDS
UPTAKE
WATER