NDLI: Heat shock-mediated H$_{2}$O$_{2}$ accumulation and protection against Cd toxicity in rice seedlings

Content Provider	Springer Nature Link
Author	Hsu, Yi Ting Kao, Ching Huei
Copyright Year	2007
Abstract	Rice (Oryza sativa L.) seedlings stressed with CdCl$_{2}$ (0.5 mM or 50 μM) showed typical Cd toxicity (leaf chlorosis, decrease in chlorophyll content, or increase in H$_{2}$O$_{2}$ and malondialdehyde contents). Rice seedlings pretreated with heat shock at 45°C (HS) for 2 or 3 h were protected against subsequent Cd stress. Rice seedlings pretreated with HS had similar Cd concentration in leaves caused by CdCl$_{2}$ as those non-HS. The content of H$_{2}$O$_{2}$ increased in leaves 1 h after HS exposure. However, APX and GR activities were higher in HS-treated leaves than their respective control, and it occurred after 2 h of HS treatment. Pretreatment of rice seedlings with H$_{2}$O$_{2}$ under non-HS conditions resulted in an increase in APX, GR, and CAT activities and protected rice seedlings from subsequent Cd stress. HS-induced H$_{2}$O$_{2}$ production and protection against subsequent Cd stress can be counteracted by imidazole, an inhibitor of NADPH oxidase complex. Results of the present study suggest that early accumulation of H$_{2}$O$_{2}$ during HS signals the increase in APX and GR activities, which in turn prevents rice seedlings from Cd-caused oxidative damage.
Starting Page	137
Ending Page	147
Page Count	11
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	300
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-09-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cadmium Heat shock Hydrogen peroxide Oryza sativa Oxidative stress Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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