Main Title |
Effects of Ultravioloet-B Radiation on Photosynthesis of Different Aged Needles in Field-Grown Loblolly Pine. |
Author |
Naidu, S. L. ;
Sullivan, J. H. ;
Teramura, A. H. ;
DeLucia, E. H. ;
|
CORP Author |
Illinois Univ. at Urbana-Champaign. Dept. of Plant Biology. ;Maryland Univ., College Park. Dept. of Botany.;Corvallis Environmental Research Lab., OR. |
Publisher |
c1993 |
Year Published |
1993 |
Report Number |
EPA-R814017020; EPA/600/J-94/085; |
Stock Number |
PB94-144730 |
Additional Subjects |
Ultraviolet radiation ;
Photosynthesis ;
Pine trees ;
Air pollution ;
Ozone ;
Damage assessment ;
Exposure ;
Leaves(Botany) ;
Age ;
Carbon isotopes ;
Nitrogen ;
Plant growth ;
Stratosphere ;
Reprints ;
Pinus taeda ;
Loblolly pine trees ;
Ultraviolet B radiation
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB94-144730 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
14p |
Abstract |
A continuing decline in stratospheric ozone concentrations caused by atmospheric pollutants has stimulated interest in consequences of increased penetration of ultraviolet-B radiation to the surface of the earth. The authors examined the effect of supplemental UV-B (290-320 nm) on photosynthetic characteristics of different aged needles of 3-year-old, field-grown loblolly pine (Pinus taeda L.). Needles in four age classes were examined: (1) most recently fully expanded, year 3; (2) first flush, year 3; (3) final flush, year 2; and (4) oldest needles still present, year 2. Enhanced UV-B radiation caused a statistically significant decrease (6%) in the ratio of variable to maximum fluorescence (F sub v)/(F sub m) following dark adaption only in needles from the youngest age class, suggesting transient damage to photosynthesis. Exposure to enhanced UV-B radiation caused a 20% decrease in total biomass and a 4% decrease in needle length of needles in age classes 1, 2, and 4, respectivly. |
Supplementary Notes |
Pub. in Tree Physiology, v12 p151-162 1993. Prepared in cooperation with Maryland Univ., College Park. Dept. of Botany. Sponsored by Corvallis Environmental Research Lab., OR. |
NTIS Title Notes |
Journal article. |
Title Annotations |
Reprint: Effects of Ultravioloet-B Radiation on Photosynthesis of Different Aged Needles in Field-Grown Loblolly Pine. |
Category Codes |
68A; 48D |
NTIS Prices |
PC A03/MF A01 |
Primary Description |
600/02 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
410526499 |
Origin |
NTIS |
Type |
CAT |