Differential responses of growth and photosynthesis in Cyamopsis tetragonoloba grown under ultraviolet-B and supplemental long-wavelength radiations
1998
Lingakumar, K. | Kulandaivelu, G. (Madurai Kamaraj Univ., Madurai (India). School of Biological Sciences)
Cyamopsis tetragonoloba seedlings were subjected to continuous ultraviolet (UV)B radiation for 18 h and post-irradiated with "white light" (WL) and UV-A enhanced fluorescent radiations. UV-B treatment alone reduced plant growth, pigment content, and photosynthetic activities. Supplementation of UV-A promoted the overall seedling growth and enhanced the synthesis of chlorophyll and carotenoids with a relatively high photosystem 1 activity. Post UV-B irradiation under WL failed to photoreactivate the LTV-B damage whereas a positive photoregulatory effect of UV-A was noticed in electron transport rates and low temperature fluorescence emission spectra.
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