Photosynthesis, Dark Respiration and Growth of Rumex Patientia L. Exposed to Ultraviolet Irradiance (288-315 Nanometers) Simulating a Reduced Atmospheric Ozone Column

Document Type

Article

Journal/Book Title/Conference

Plant Physiology

Publication Date

1976

Volume

58

Abstract

Net photosynthesis, dark respiration, and growth of Rumex patientia L. exposed to a ultraviolet irradiance (288-315 nanometers) simulating a 0.18 atm·cm stratospheric ozone column were determined. The ultraviolet irradiance corresponding to this 38% ozone decrease from normal was shown to be an effective inhibitor of photosynthesis and leaf growth. The repressive action on photosynthesis accumulated through time whereas leaf growth was retarded only during the initial few days of exposure. Small increases in dark respiration rates occurred but did not continue to increase with longer exposure periods. A reduction in total plant dry weight and leaf area of approximately 50% occurred after 22 days of treatment, whereas chlorophyll concentrations remained unaltered.

First Page

563

Last Page

568

Link to Full Text

Share

COinS