Photosynthetica 1997, 33(11):37-44 | DOI: 10.1023/A:1006855532424

Changes in leaf protein and pigment contents and photosynthetic activities during senescence of detached maize leaves: influence of different ultraviolet radiations

B. BISWAL1, P.N. JOSHI1, G. KULANDAIVELU2
1 Laboratory of Biophysics and Biochemistry, School of Life Sciences, Sambalpur University, Jyoti Vihar, Dist. Sambalpur, Orissa, India-
2 School of Biological Science, Madurai Kamaraj University, Madurai, Tamilnadu, India-

Senescence induced loss in pigments and proteins of detached maize (Zea mays L. cv. Col) leaves was significantly enhanced on the exposure of leaves to different ranges of ultraviolet (UV) radiation. Compared to UV-A (320-400 nm) and UV-B (280-320 nm), the UV-C (200-320 nm) was the most damaging for the pigments and macromolecules. A severe decline in photosystem (PS) 2 mediated photoreduction during senescence of detached leaves exposed to UV irradiation suggested a damage of the system. The PS1 mediated photoreduction of methylviologen with 2,6-dichlorophenol indophenol as electron donor was stimulated by UV-A and UV-B radiations, suggesting a reorganisation of the PS1 complex. These results were fortified by the values of fast and slow kinetics of chlorophyll (Chl) a fluorescence transients.

Additional key words: carotenoids; chlorophyll fluorescence; photosystems 1 and 2; UV-A, UV-B, UV-C; Zea mays

Prepublished online: January 1, 1998; Published: January 1, 1997  Show citation

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BISWAL, B., JOSHI, P.N., & KULANDAIVELU, G. (1997). Changes in leaf protein and pigment contents and photosynthetic activities during senescence of detached maize leaves: influence of different ultraviolet radiations. Photosynthetica, 34(1), 37-44. doi: 10.1023/A:1006855532424
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