? Responses of the antioxidant system to fluroxypyr in foxtail millet (<em>Setaria italica</em> L.) at the seedling stage
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    2018, Vol. 17 Issue (03): 554-565     DOI: 10.1016/S2095-3119(17)61808-2
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Responses of the antioxidant system to fluroxypyr in foxtail millet (Setaria italica L.) at the seedling stage
GUO Mei-jun, WANG Yu-guo, YUAN Xiang-yang, DONG Shu-qi, WEN Yin-yuan, SONG Xi-e, GUO Ping-yi  
Key Laboratory of Crop Chemical Regulation and Chemical Weed Control of Shanxi Province/Agronomy College, Shanxi Agricultural University, Taigu 030801, P.R.China
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Abstract Foxtail millet (Setaria italica L.) is an important food and fodder crop in semi-arid areas.  However, there are few herbicides suitable for use on weed control in field-grown foxtail millet during the post-emergence herbicides stage.  The present study was conducted using four concentrations (0.5, 1, 2, and 4 L ai ha–1) of foliar-applied fluroxypyr, and the effect of fluroxypyr on selected metabolic and stress-related parameters in foxtail millet were assessed after 15 days.  In this study, increasing concentrations decreased plant height and accumulation of chlorophylls.  Our results also showed that malondialdehyde (MDA) accumulated in response to fluroxypyr application, demonstrating increased lipid peroxidation due to excessive reactive oxygen species production.  In response to this oxidative stress, the activities of antioxidant enzymes were generally enhanced.  Non-enzymatic antioxidant defense systems, which function in concert with antioxidant enzymes, can also protect plant cells from oxidative damage by scavenging reactive oxygen species (ROS).  In conclusion, the hybrid variety (Zhangzagu) exhibited a greater tolerance to fluroxypyr than did the conventional variety Jingu 21, which might be associated with the antioxidant mechanisms of Zhangzagu hybrid millet.  
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Key words�� antioxidant defense system     fluroxypyr     reactive oxygen species     Spring hybrid millet     
Received: 2017-03-10; Published: 2017-10-10

This work was supported by the National Natural Science Foundation of China (31301269), the National Key Technologies R&D Program of China (2014BAD07B01), the Scientific and Technological Project in Shanxi Province, China (20150311016-2), the Science and Technology Key Research Project in Shanxi Province, China (2015-TN-09), the Key Research and Development General Project in Shanxi Province, China (201603D221003-2), and the Program for the Top Young Innovative Talents of Shanxi Agricultural University, China (TYIT201406).

Corresponding Authors: Correspondence WANG Yu-guo, E-mail: tgwygn@126.com; GUO Ping-yi, Tel: +86-354-6286938, Fax: +86-354-6289272, E-mail: pyguo126@126.com   
About author: GUO Mei-jun, E-mail: guomeijun1989@126.com
Cite this article:   
GUO Mei-jun, WANG Yu-guo, YUAN Xiang-yang, DONG Shu-qi, WEN Yin-yuan, SONG Xi-e, GUO Ping-yi. Responses of the antioxidant system to fluroxypyr in foxtail millet (Setaria italica L.) at the seedling stage[J]. Journal of Integrative Agriculture, 2018, 17(03): 554-565.
http://www.chinaagrisci.com/Jwk_zgnykxen/EN/10.1016/S2095-3119(17)61808-2      or     http://www.chinaagrisci.com/Jwk_zgnykxen/EN/Y2018/V17/I03/554
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