UV-B Exposure Enhances Senescence of Wheat Leaves: Modulation by Photosynthetically Active Radiation

Overview

Journal Radiat Environ Biophys

Specialties Biophysics
Environmental Health
Oncology
Radiology

Date 2006 Jul 20

PMID 16850336

Citations 3

Authors

M K Pradhan

P N Joshi

J S Nair

N K Ramaswamy

R K Iyer

B Biswal

U C Biswal

Affiliations

Soon will be listed here.

Abstract

The alterations in structure and function of photosystem II (PS II) during the senescence of primary leaves of wheat seedlings have been compared with the changes induced by ultraviolet-B (UV-B) radiation in the presence or absence of photosynthetically active radiation (PAR). The results indicated that the senescence-induced loss in pigment content, thylakoid membrane integrity and carotenoid-to-chlorophyll (Car-to-Chl) energy transfer efficiency was intensified by exposure to UV-B radiation. Different parameters for the measurement of PS II activity, such as Chl a fluorescence, O2-evolution and thermoluminescence intensity, were altered during senescence and these alterations were furthered by UV-B irradiation. The damage of photosynthetic apparatus by UV-B exposure in the presence of PAR was less than the damage in absence of PAR. The activation of molecular defense mechanisms could be a factor in the alleviation of UV-B damage in the presence of PAR.

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