Influences of different UV-B radiation treatments in short time on some physiological characteristics of winter wheat seedlings | 短时间不同剂量UV-B辐射处理对冬小麦幼苗生理指标的影响
2009
Zhang Wenhui, Liaocheng University, Liaocheng (China), School of Life Sciences | Wang Mingzhuo, Liaocheng University, Liaocheng (China), School of Life Sciences | Miao Xiulian, Liaocheng University, Liaocheng (China), School of Life Sciences
[Objective] studying the influences of different UV-B radiation treatments in short time on some physiological characteristics of winter wheat seedlings was to provide reference for the mechanism of plant response to ultraviolet irradiation in short time. [Method] The winter wheat taken as materials were treated with 15 and 30μW/cm2 UV-B radiation, then the physiological indexes such as pigment content and photosynthetic rate were determined. [Results] The UV-B treatment caused the declines of chlorophyll content, soluble protein content and water content of leaves, besides, dose-effect was existed. The decline of 30 μW/cm2 treatment was bigger than that of 15 μW/cm2 treatment. The influences of UV-B radiation on carotenoid content and anthocyanidin content were similar; the change trends were declined firstly then increased. The UV-B treatment with two doses restrained the electron transport of PSⅡ, particularly; the inhibitory effect was biggest after treated 2h, and then this effect was declined in 4, 6 and 8h, so the dose-effect was existed. The UV-B radiation with two doses restricted photosynthetic rate and the inhibitory effect increased with the increase of treatment time. The high dose treatment caused huge damage to membrane system, while the result of low dose treatment was not obvious. [Conclusion] UV-B radiation treatment had dose-effect on winter wheat seedlings in short time and the influence of high dose was bigger than that of low dose. With the increase of treatment time, the damage was alleviated; besides, the result was not similar to that of UV-B radiation in long time.
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