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Effects of ultraviolet-B enhanced radiation and temperature on growth and photochemical activities in Vigna unguiculata

AutorNedunchezhian, N.; Kulandaivelu, G.
Fecha de publicación1996
EditorKluwer Academic Publishers
CitaciónBiologia Plantarum 38: 205-214 (1996)
ResumenChanges in growth characteristics and photochemical activities in Vigna unguiculata L. Walp seedlings maintained at constant temperature of 10, 20, 30 and 40 °C under control and ultraviolet-B enhanced radiation (UV-B) were investigated. UV-B retarded the shoot elongation and also leaf expansion to a great extent at 30 °C but produced only marginal changes at 20 and 40 °C. Similar response was also observed with respect to changes in leaf fresh and dry masses and total chlorophyll (Chl) content under these temperatures. At 10 °C the total Chl content was 3-fold higher under the treatment than under control conditions. In seedlings growing at 20 and 30 °C the overall photosynthetic electron transport (H2O → methyl viologen) showed a significant enhancement during the 36-h UV-B treatment and thereafter a gradual reduction. Although a similar trend was found in photosystem 1 (PS1), the inhibition even after 60 h of UV-B treatment was not statistically significant. Photosystem 2 (PS2) activity was inhibited in seedlings treated for 60 h by UV-B at 20 and 30 °C. However, no inhibition was observed at 40 °C. No detectable photochemical activity was found in seedlings grown at 10 °C under either control or UV-B enhanced irradiation although the chloroplasts contained Chl.
URIhttp://hdl.handle.net/10261/121226
DOInull
Identificadoresdoi: null
issn: 0006-3134
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