Influence of needle age on sensitivity of Scotch pine to acute doses of SO/sub 2/

Journal Article · Sat Oct 01 04:00:00 EDT 1977 · Plant Dis.; (United States)

OSTI ID:5377047

Smith, H J; Davis, D D

Young Scotch pine seedlings in the cotyledon, primary, and secondary needle stages were exposed to 2620 ..mu..g/m/sup 3/ (1.0 ppm) SO/sub 2/ for 1, 3, or 5 hours. Exposures were conducted at time of needle emergence, and when the current foliage was 1, 3, 5, and 7 weeks of age. Secondary needles were generally more sensitive than were primary needles. Cotyledons were generally more tolerant than the other two needle types. The sensitivity of all three needle types was at a minimum at time of needle emergence, increased through 3 to 5 weeks, and then remained constant or decreased from 5 to 7 weeks. All three needle types exhibited needle tip necrosis as the common symptom. 14 references.

• Research Organization: Pennsylvania State Univ., University Park
• OSTI ID: 5377047
• Journal Information: Plant Dis.; (United States), Journal Name: Plant Dis.; (United States) Vol. 61:10; ISSN PLDID
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AGE DEPENDENCE
BIOLOGICAL EFFECTS
CHALCOGENIDES
CONIFERS
DATA
EXPERIMENTAL DATA
INFORMATION
LEAVES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PINES
PLANTS
SENSITIVITY
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TREES