Photosynthetica 2008, 46(3):370-377 | DOI: 10.1007/s11099-008-0067-z

Developmental phase-dependent photosynthetic responses to ultraviolet-B radiation: damage, defence, and adaptation of primary leaves of wheat seedlings

M. K. Pradhan1, L. Nayak1, P. N. Joshi1,*, P. K. Mohapatra2, L. Patro2, B. Biswal2, U. C. Biswal2
1 Laboratory of Biophysics and Biochemistry, Anchal College, Orissa, India
2 Laboratory of Biophysics and Biochemistry, School of Life Sciences, Sambalpur University, Orissa, India

Alterations in photosynthetic capacity of primary leaves of wheat seedlings in response to ultraviolet-B (UV-B; 280-320 nm; 60 µmol m-2 s-1) exposure alone and in combination with photosynthetically active radiation (PAR; 400-800 nm; 200 µmol m-2 s-1) during different phases of leaf growth and development were assessed. UV-B exposure resulted in a phase-dependent differential loss in photosynthetic pigments, photochemical potential, photosystem 2 (PS2) quantum yield, and in vivo O2 evolution. UV-B exposure induced maximum damage to the photosynthetic apparatus during senescence phase of development. The damages were partially alleviated when UV-B exposure was accompanied by PAR. UV-B induced an enhancement in accumulation of flavonoids during all phases of development while it caused a decline in anthocyanin content during senescence. The differential changes in these parameters demonstrated the adaptation ability of leaves to UV-B stress during all phases of development and the ability was modified in UV-B+ PAR exposed samples.

Additional key words: anthocyanin; carotenoids; chlorophyll; flavonoids; O2 evolution; photosynthetically active radiation; phases of leaf development; senescence; thylakoid membrane

Received: November 20, 2007; Accepted: March 14, 2008; Published: September 1, 2008  Show citation

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Pradhan, M.K., Nayak, L., Joshi, P.N., Mohapatra, P.K., Patro, L., Biswal, B., & Biswal, U.C. (2008). Developmental phase-dependent photosynthetic responses to ultraviolet-B radiation: damage, defence, and adaptation of primary leaves of wheat seedlings. Photosynthetica46(3), 370-377. doi: 10.1007/s11099-008-0067-z
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