skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Photosynthesis, growth, and ultraviolet irradiance absorbance of Cucurbita pepo L. leaves exposed to ultraviolet-B radiation (280 to 315 nm)

Abstract

Net photosynthesis, growth, and ultraviolet (uv) radiation absorbance were determined for the first leaf of Cucurbita pepo L. exposed to two levels of uv-B irradiation and a uv-B radiation-free control treatment. Absorbance by extracted flavonoid pigments and other uv-B radiation-absorbing compounds from the first leaves increased with time and level of uv-B radiation impinging on leaf surfaces. Although absorbance of uv-B radiation by extracted pigments increased substantially, uv-B radiation attenuation apparently was insufficient to protect completely the photosynthetic apparatus or leaf growth processes. Leaf expansion was repressed by daily exposure to 1365 Joules per meter per day of biologically effective uv-B radiation by not by exposure to 660 Joules per meter per day. Photosynthesis measured through ontogenesis of the first leaf was depressed by both uv-B radiation treatments. Repression of photosynthesis by uv-B radiation was especially evident during the ontogenetic period of maximum photosynthetic activity.

Authors:
Publication Date:
Research Org.:
New Mexico State Univ., Las Cruces
OSTI Identifier:
6637908
Alternate Identifier(s):
OSTI ID: 6637908
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plant Physiol.; (United States); Journal Volume: 67:1
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; LEAVES; RADIOSENSITIVITY; PHOTOSYNTHESIS; ULTRAVIOLET RADIATION; ATTENUATION; BIOLOGICAL RADIATION EFFECTS; DAILY VARIATIONS; DATA; DOSE-RESPONSE RELATIONSHIPS; OZONE; PIGMENTS; PLANT GROWTH; PLANTS; QUANTITY RATIO; RADIATION DOSES; TIME DEPENDENCE; BIOLOGICAL EFFECTS; CHEMICAL REACTIONS; DOSES; ELECTROMAGNETIC RADIATION; GROWTH; INFORMATION; PHOTOCHEMICAL REACTIONS; RADIATION EFFECTS; RADIATIONS; SYNTHESIS; VARIATIONS 560141* -- Radiation Effects on Plants-- Basic Studies-- (-1987)

Citation Formats

Sisson, W.B. Photosynthesis, growth, and ultraviolet irradiance absorbance of Cucurbita pepo L. leaves exposed to ultraviolet-B radiation (280 to 315 nm). United States: N. p., 1981. Web. doi:10.1104/pp.67.1.120.
Sisson, W.B. Photosynthesis, growth, and ultraviolet irradiance absorbance of Cucurbita pepo L. leaves exposed to ultraviolet-B radiation (280 to 315 nm). United States. doi:10.1104/pp.67.1.120.
Sisson, W.B. Thu . "Photosynthesis, growth, and ultraviolet irradiance absorbance of Cucurbita pepo L. leaves exposed to ultraviolet-B radiation (280 to 315 nm)". United States. doi:10.1104/pp.67.1.120.
@article{osti_6637908,
title = {Photosynthesis, growth, and ultraviolet irradiance absorbance of Cucurbita pepo L. leaves exposed to ultraviolet-B radiation (280 to 315 nm)},
author = {Sisson, W.B.},
abstractNote = {Net photosynthesis, growth, and ultraviolet (uv) radiation absorbance were determined for the first leaf of Cucurbita pepo L. exposed to two levels of uv-B irradiation and a uv-B radiation-free control treatment. Absorbance by extracted flavonoid pigments and other uv-B radiation-absorbing compounds from the first leaves increased with time and level of uv-B radiation impinging on leaf surfaces. Although absorbance of uv-B radiation by extracted pigments increased substantially, uv-B radiation attenuation apparently was insufficient to protect completely the photosynthetic apparatus or leaf growth processes. Leaf expansion was repressed by daily exposure to 1365 Joules per meter per day of biologically effective uv-B radiation by not by exposure to 660 Joules per meter per day. Photosynthesis measured through ontogenesis of the first leaf was depressed by both uv-B radiation treatments. Repression of photosynthesis by uv-B radiation was especially evident during the ontogenetic period of maximum photosynthetic activity.},
doi = {10.1104/pp.67.1.120},
journal = {Plant Physiol.; (United States)},
number = ,
volume = 67:1,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1981},
month = {Thu Jan 01 00:00:00 EST 1981}
}