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  • Title: UV-B exposure enhances senescence of wheat leaves: Modulation by photosynthetically active radiation.
    Author: Pradhan MK, Joshi PN, Nair JS, Ramaswamy NK, Iyer RK, Biswal B, Biswal UC.
    Journal: Radiat Environ Biophys; 2006 Sep; 45(3):221-9. PubMed ID: 16850336.
    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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