Regulation of photosynthetic performance and antioxidant capacity by 60Co γ-irradiation in Zizania latifolia plants
Regulation of photosynthetic performance and antioxidant capacity by 60Co γ-irradiation in Zizania latifolia plants
复制标题
Co-60 伽马射线照射对茭白植物光合性能和抗氧化能力的调节
DOI：
10.1016/j.jenvrad.2013.11.013
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发表时间：
2014-03-01
影响因子：
2.3
通讯作者：
Guo, De-Ping
中科院分区：
文献类型：
--
作者：
Fan, Jing;Shi, Min;Guo, De-Ping
The aim of the present work was to investigate the photosynthetic performance and antioxidant enzyme activities in response to gamma-irradiation of an aquatic plant Zizania latifolia. The Z latifolia seedlings at 6-leaf stage were exposed to 25, 50 and 100 Gy of gamma rays from a Co-60 source. The growth parameters, chlorophyll contents, photosynthetic gas exchange, chlorophyll fluorescence, malondialdehyde (MDA) content, antioxidant enzyme activities and antioxidant contents were examined at 1-5 weeks postirradiation (WPI). The results showed that plant height, leaf number and tiller (branch close to ground) number were significantly suppressed by 50 and 100 Gy irradiation at 5, 3-5 and 4-5 WPI, respectively, but they were not significantly different from control by 25 Gy irradiation. Chlorophyll a, chlorophyll b, and total chlorophyll contents were also found to be significantly decreased by irradiation. The net photosynthetic rate (P-n), stomatal conductance (G(s)), intercellular CO2 concentration (CO and transpiration rate (T-r) generally declined in a dose-dependent manner. As for the chlorophyll fluorescence parameters, maximum quantum efficiency of PSII photochemistry (F-v/F-m,), actual photochemical efficiency of PSII (Phi(PSII)) and photochemical quenching (qP) were observed to be significantly decreased compared to the control at 3 WPI, while non-photochemical quenching (NPQ) significantly increased by 100 Gy. gamma-irradiation induced substantial increase in MDA content, ascorbate peroxidase (APX) activity, reduced ascorbate (AsA) content and reduced glutathione (GSH) content, suggesting a protective mechanism of Z. latifolia plant against oxidative stress when exposed to gamma-irradiation. (C) 2013 Elsevier Ltd. All rights reserved.
