Responses of three soybean cultivars exposed to UV-B radiation

Abstract To understand the responses of various soybean (Glycine max) cultivars to ultraviolet-B, Dongnong 42, Zhonghuang 57 and Jin 36 were cultured either under UV-B radiation (10.08 kJ / m-2 UV-B) or without UV-B for 25 days. Under UV-B irradiation, significant difference were observed in plant height, nodes length, contents of soluble sugar, proline, protein, flavionoids, GSH, ASA, relative content of anthocyanins, also the emzymes activities of APX ,SOD and GR. The lowest plant height was presented in Jin 36, followed Zhonghuang 57 and Dongnong 42. The node length of plant decreased from the first node to the fourth one, and the maximal reduction was observed in Jin 36. Contents of protein, flavionoids, GSH, ASA and anthocyanins as well as emzyme activities of APX, SOD and GR significantly increased under UV-B irradiation where content of protein and activities of emzyme APX, SOD and GR were higher in Zhonghuang 57 than those in Dongnong 42 and Jin 36; higher GSH, ASA, flavonoids, as well as the anthocyanins were showed in Donghong 42. Increased proline content was observed in the three cultivars upon UV-B (p<0.05) where Zhonghuang 57 >Dongnong 42 > Jin36; for the soluble sugar content, the order was Zhongnong 57>Jin 36>Dongnong 42 (p<0.05). Various soybean cultivars showed varied physiological responses upon UV-B.

Keywords UV-B, soybean, cultivars, physiological characters, response.

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