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Journal of Integrative Agriculture  2018, Vol. 17 Issue (08): 1736-1744    DOI: 10.1016/S2095-3119(18)61939-2
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Silencing of OsXDH reveals the role of purine metabolism in dark tolerance in rice seedlings
HAN Rui-cai, Adnan Rasheed, WANG Yu-peng, WU Zhi-feng, TANG Shuang-qin, PAN xiao-hua, SHI Qing-hua, WU Zi-ming
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Collaborative Innovation Center for
the Modernization Production of Double Cropping Rice/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding
of Jiangxi Province/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, P.R.China
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摘要  Received  29 September, 2017    Accepted  11 February, 2018


Abstract  
Xanthine dehydrogenase (XDH) is a crucial enzyme involved in purine metabolism.   To evaluate the effect of XDH deficiency on rice growth during dark treatment, wild type (WT) Nipponbare (Oryza sativa L.) and two independent transgenic lines with severe RNAi suppression (xdh3 and xdh4) were used in the present experiment.  Under normal growth conditions, chlorophyll levels and biomass were indistinguishable between WT and the two RNAi transgenic lines, but XDH enzyme activity and ureide levels were suppressed in XDH RNAi transgenic lines.  When XDH RNAi transgenic lines were subjected to dark treatment, chlorophyll content and biomass were significantly decreased, while O2· production rate and malonaldehyde (MDA) were significantly increased compared to WT.  The spraying test of exogenous allantoin raised chlorophyll content and biomass and reduced O2· production rate and MDA in WT and both transgenic lines, and it also simultaneously reduced differences between RNAi and WT plants caused by XDH deficiency in growth potential and anti-oxidative capacity under dark treatment.  These results suggested that fully functional purine metabolism plays an important role in reducing the sensitivity of rice seedlings to dark stress.
 
Keywords:  xanthine dehydrogenase        rice seedlings        dark tolerance        allantoin        purine metabolism  
Received: 29 September 2017   Accepted:
Fund: The research was supported by the National Natural Science Foundation of China (31560350 and 31760350) and the Science and Technology Program of Jiangxi, China (20171ACF60018).
Corresponding Authors:  Correspondence WU Zi-ming, Tel: +86-791-83828113, Fax: +86-791-83813877, E-mail: wuzmjxau@163.com    
About author:  HAN Rui-cai, E-mail: hrc1988113@163.com;

Cite this article: 

HAN Rui-cai, Adnan Rasheed, WANG Yu-peng, WU Zhi-feng, TANG Shuang-qin, PAN xiao-hua, SHI Qing-hua, WU Zi-ming. 2018. Silencing of OsXDH reveals the role of purine metabolism in dark tolerance in rice seedlings. Journal of Integrative Agriculture, 17(08): 1736-1744.

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