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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (02): 352-359.doi: 10.3724/SP.J.1006.2012.00352


Effects of PASP-KT-NAA on Photosynthesis and Antioxidant Enzyme Activities of Maize Seedlings under Low Temperature Stress

XU Tian-Jun1,DONG Zhi-Qiang1,*,LAN Hong-Liang1,PEI Zhi-Chao1, 2,GAO Jiao1,XIE Zhen-Xing1   

  1. 1 Institute of Crop Science, Chinese Academy of Agricultural Sciences/ Key Laboratory of Crop Eco-physiology and Cultivation, Beijing 100081, China; 2 Beijing Agricultural Technology Extension Station, Beijing 100029, China
  • Received:2011-03-31 Revised:2011-07-25 Online:2012-02-12 Published:2011-11-07
  • Contact: 董志强, E-mail: dongzhiqiang@126.com, Tel: 010-82106043

Abstract: A pet experiment of maize seedlings was conducted to investigate the effects of low temperature stress and the chemical regulator of PASP-KT-NAA (PKN) on photosynthetic, physiological parameters, chlorophyll contents, and various antioxidant enzymes activities. The results showed that, in maize seedlings under low temperature stress the photosynthesis ability and SOD, POD, CAT activities reduced; the formation speed of hydrogen peroxide and superoxide anion, as well as MDA contents increased. PKN pretreatment increased Pn, Gs, Fv/Fm, and chlorophyll contents. Under low temperature stress for seven days, Pn, Gs, Fv/Fm, chlorophyll contents of ZDTR and FDTR were higher than those of CK, which was increased by 88.95% and 61.11%, 593.33% and 1 741.67%, 111.50% and 145.16%, 36.61% and 54.03%. While the formation speed of hydrogen peroxide and superoxide anion reduced, MDA contents decreased too. Simultaneously, SOD, POD, CAT activities were increased by 292.59% and 632.98%, 295.07% and 360.54%, 254.55% and 265.45%. In conclusion, PKN pretreatment can improve the cold resistance of maize seedlings

Key words: Low temperature stress, Antioxidant enzyme, Photosynthesis, Maize seedlings, PKN regulation

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