Influence of type UV-B radiations of different wavelengths regarding the photosynthetic activity during plant development of Zea mays L.

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Article Title:	Influence of type UV-B radiations of different wavelengths regarding the photosynthetic activity during plant development of Zea mays L.
Authors:	Maria Orodan, Violeta Turcuş, Gongyi Osser, Aurel Ardelean
Affiliation:	”Vasile Goldis” Western University Arad, Romania
Abstract:	In general, UV-B radiation causes a net inhibition of photosynthesis for a wide range of plants (Tevini, 1993). From laboratory studies, this inhibition appears to result from a malfunction in the photosynthetic cycle including PSII reaction centers perturbation (Stride et al., 1992). Stomatitis function, and thus gas exchange at the leaf level is also affected (Teramura, 1990; Tevini and Teramura, 1989). In our experiments we sought to answer the question whether treatment with UV-B radiation type, of different wavelengths of 280-310 nm, has a stressful effect on plants by the appearance of changes in photosynthetic activity, and if there are differences in this regard between controlled and treated plants. All measurements were performed on days 1, 3 and 4 of treatment, at young plants; samples were consisting of leaves taken from plants in which the 3rd leaf was fully developed.
Keywords:	photosynthetic activity, UV-B radiation, photosynthetic system, PSII protein complex
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*Correspondence:	Maria Orodan, ”Vasile Goldis” Western University, Arad, 91-93 Liviu Rebreanu St., Arad, Romania, Tel./Fax +40-(257)-228622, email: rosu.marcel-ar@ansvsa.ro