Plants for environmental studies by Wun-cheng Wang, Joseph W Gorsuch, Jane Staveley Hughes

By Wun-cheng Wang, Joseph W Gorsuch, Jane Staveley Hughes

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1986; Mohr 1986; Gaba and Black 1987; Hashimoto et al. 1991). For instance, there seems to be an interaction between the UV-B photoreceptor and phytochrome for flavonoid synthesis (Beggs et al. 1986). Rapid and readily quantifiable morphological assays could begin to alleviate the shortfall in information on the UV-B photoreceptor. Along these lines, we have discovered a response to UV-B, upward curling of B. napus L. cotyledons, that may be useful for probing the mechanism of UV-B photoreception (Wilson and Greenberg 1993b).

DNA photoproducts and tryptophan radicals can be generated by UV-B radiation. In the case of UV-B-mediated PAH toxicity to plants, singlet oxygen is considered to be a primary factor in damage (Greenberg et al. 1993a). Carotenoids are good quenchers of oxygen radicals and can protect against chlorophyll photobleaching (Foote et al. 1970). The concentration of carotenoids was reported to rise in response to UV-B in soybean, and these increases were found to correlate with protection of net photosynthesis from UV-B (Middleton and Teramura 1993b).

Martinus Nijhoff, Dordrecht, Holland, pp. 158–165. Virgin I, Andersson B, Aro E-M (1993) Photoinhibition of photosystem II. Inactivation, protein damage and turnover. Biochim Biophys Acta 1143:113–134. , Garrard LA (1982) Effects of supplemental UV-B radiation on primary photosynthetic carboxylating enzymes and soluble proteins in leaves of C3 and C4 crop plants. Physiol Plant 55:11–16. , Garrard LA (1984) Effects of enhanced UV-B radiation (280–320nm) on ribulose-1,5-bisphosphate carboxylase in pea and soybean.

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